Data access arrangement using a high frequency transformer for electrical isolation
First Claim
1. An electrical isolation barrier for use in a data access arrangement for providing electrical isolation between a system side circuit and a line side circuit, comprising, in combination:
- an HF transformer having a desired frequency range of operation, and having a first port and a second port;
a first modulator coupled to first port of said HF transformer, said first modulator modulating a first 1-bit digital signal to a first analog pass band signal within said desired frequency range and transmitting the modulated signal to said HF transformer;
a first demodulator coupled to said first second port of said HF transformer, said demodulator demodulating said first analog pass band signal to recover said first 1-bit digital signal for transmission to said line side circuit;
wherein said first modulator is coupled to said HF transformer through a first HF hybrid circuit and said HF transformer is coupled to said first demodulator through a second HF hybrid circuit;
a second modulator coupled to said second port of said HF transformer through said second HF hybrid circuit, said second modulator modulating a second 1-bit digital signal to a second analog pass band signal within said desired frequency range and transmitting it to said HF transformer;
a second demodulator coupled to said first port of said HF transformer through said first HF hybrid circuit, said second demodulator demodulating said second analog pass band signal to recover said second 1-bit digital signal for transmission to said system side circuit; and
wherein the line side circuit includes an analog portion of a sigma-delta codec, said analog portion converting an analog receive signal to a third 1-bit digital signal; and
wherein the line side circuit includes a second multiplexor connected to said second modulator, receiving digital status signals and said third 1-bit digital signal, said multiplexor combining said digital status signals and said third 1-bit digital signal to form said second 1-bit digital signal.
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Accused Products
Abstract
An electrical isolation barrier for use in a Data Access Arrangement uses a high frequency (HF) transformer 24 to provide isolation. An input signal, which may be analog or digital, is connected to a modulator. The analog output of the modulator is connected to the input of the HF transformer. The output of the HF transformer is connected to the input of a demodulator. Simple amplitude modulation can be used in the modulator to modulate the input signal to the frequency range of operation of the HF transformer. A simple low pass filter may be incorporated in the demodulator to remove harmonic distortion caused by the HF transformer. The output signal of the demodulator is substantially the same as input signal.
88 Citations
53 Claims
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1. An electrical isolation barrier for use in a data access arrangement for providing electrical isolation between a system side circuit and a line side circuit, comprising, in combination:
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an HF transformer having a desired frequency range of operation, and having a first port and a second port; a first modulator coupled to first port of said HF transformer, said first modulator modulating a first 1-bit digital signal to a first analog pass band signal within said desired frequency range and transmitting the modulated signal to said HF transformer; a first demodulator coupled to said first second port of said HF transformer, said demodulator demodulating said first analog pass band signal to recover said first 1-bit digital signal for transmission to said line side circuit; wherein said first modulator is coupled to said HF transformer through a first HF hybrid circuit and said HF transformer is coupled to said first demodulator through a second HF hybrid circuit; a second modulator coupled to said second port of said HF transformer through said second HF hybrid circuit, said second modulator modulating a second 1-bit digital signal to a second analog pass band signal within said desired frequency range and transmitting it to said HF transformer; a second demodulator coupled to said first port of said HF transformer through said first HF hybrid circuit, said second demodulator demodulating said second analog pass band signal to recover said second 1-bit digital signal for transmission to said system side circuit; and wherein the line side circuit includes an analog portion of a sigma-delta codec, said analog portion converting an analog receive signal to a third 1-bit digital signal; and wherein the line side circuit includes a second multiplexor connected to said second modulator, receiving digital status signals and said third 1-bit digital signal, said multiplexor combining said digital status signals and said third 1-bit digital signal to form said second 1-bit digital signal. - View Dependent Claims (2, 3, 4)
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5. An electrical isolation barrier for use in a data access arrangement for providing electrical isolation between a system side circuit and a line side circuit, comprising, in combination:
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an HF transformer having a desired frequency range of operation, and having a first port and a second port; a first modulator coupled to first port of said transformer through a first HF hybrid circuit, said first modulator modulating a first 1-bit digital signal to a first analog pass band signal within said desired frequency range and transmitting the modulated signal to said transformer; a first demodulator coupled to said second port of said transformer through a second HF hybrid circuit, said demodulator demodulating said first pass band signal to recover said first 1-bit digital signal for transmission to said line side circuit; a second modulator coupled to said second port of said transformer through said second HF hybrid circuit, said second modulator modulating a third 1-bit digital signal to a second analog pass band signal within said desired frequency range and transmitting it to said transformer; a second demodulator coupled to said first port of said transformer through said first HF hybrid circuit, said second demodulator demodulating said second pass band signal to recover said third 1-bit digital signal for transmission to said system side circuit; a digital portion of a sigma-delta codec included in said system side circuit for converting digital modem signals to a second 1-bit digital signal and converting a fourth 1-bit digital signal to digital modem signals; a first multiplexor included in the system side circuit and connected to said first modulator, said first multiplexor receiving digital control signals and said second 1-bit digital signal and multiplexing them to form said first 1-bit digital signal; a first demultiplexor included in the line side circuit and connected to the first demodulator, said first demultiplexor separating the digital control signals and second 1-bit digital signal from the recovered first 1-bit digital signal; an analog portion of a sigma-delta codec included in the line side circuit, said analog portion converting an analog receive signal to a fourth 1-bit digital signal and converting a second 1-bit digital signal to an analog transmit signal; a second multiplexor included in the line side circuit and connected to said second modulator, said second multiplexor receiving digital status signals and said fourth 1-bit digital signal and combining them to form said third 1-bit digital signal; a second demultiplexor included in the system side circuit and connected to the second demodulator, said second demultiplexor recovering said digital status signals and said fourth 1-bit digital signal from the recovered third 1-bit digital signal. - View Dependent Claims (6)
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7. An electrical isolation barrier for use in a data access arrangement, comprising, in combination:
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an input circuit and an output circuit; an HF transformer for providing electrical isolation between the input circuit and the output circuit and having a frequency range of desired operation, said transformer having two ports; a modulator and high frequency circuit combination capable of bidirectional operation and having an input and an output, said modulator input capable of being connected to the input circuit, said modulator shifting an input signal to a bandpass signal within the frequency range of the transformer, such that integer multiples of two or greater of frequencies of the shifted input signal fall outside of the frequency range of the transformer; said modulator output coupled to the first port of the transformer to supply said shifted signals to the transformer; a demodulator and high frequency circuit combination capable of bidirectional operation having an input and an output, said demodulator input coupled to the second port of the transformer, said demodulator shifting said bandpass signals from the frequency range of the transformer to an output signal for use by the output circuit. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. The method of providing an electrical isolation barrier in a modem system comprising the steps of:
providing a single high frequency transformer in the data access arrangement section of the modem, which transformer has a predetermined frequency operation range and an input port and an output port, and is capable of duplex operation; shifting an input signal to a passband within the frequency operation range of the transformer such that integer multiples of two or greater of frequencies of the shifted signal fall outside of the frequency range of the transformer, and providing the shifted signal to the transformer input port; obtaining from the output port of the transformer an output signal; and shifting the output signal to recover the input signal. - View Dependent Claims (20, 21, 22)
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23. An electrical isolation barrier for use in a data access arrangement for providing electrical isolation between a line side circuit and a system side circuit, comprising, in combination:
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a first pair of input and output circuits for a TX signal and a second pair of input and output circuits for an RX signal, wherein the first input circuit and the second output circuit are located in the line side circuit, and the second input circuit and the first output circuit are located in the system side circuit; a first HF transformer for providing electrical isolation between the first pair of input and output circuits and having a frequency range of desired operation, said first transformer having two ports; a first modulator having an input and an output, said first modulator input capable of being connected to the input circuit of the first pair of input and output circuits and modulating an input signal to frequencies within the frequency range of the first transformer such that integer multiples of two or greater of frequencies of the shifted signal fall outside of the frequency range of the transformer; said first modulator output connected to the first port of the first transformer to supply the modulated signals to the first transformer; a first demodulator having an input and an output, said first demodulator input connected to the second port of the first transformer for demodulating signals from the frequency range of the first transformer to an output signal for use by the output circuit of the first pair of input and output circuits; a second HF transformer for providing electrical isolation between the second pair of input and output circuits and having a frequency range of desired operation, said second transformer having two ports; a second modulator having an input and an output, said second modulator input capable of being connected to the input circuit of the second pair of input and output circuits and modulating the input signal to frequencies within the frequency range of the second transformer; said second modulator output connected to the first port of the second transformer to supply the modulated signals to the second transformer; a second demodulator having an input and an output, said second demodulator input connected to the second port of the second transformer for demodulating signals from the frequency range of the second transformer to an output signal for use by the output circuit of the second pair of input and output circuits.
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24. An electrical isolation barrier for use in a data access arrangement for providing electrical isolation between a system side circuit and a line side circuit, comprising, in combination:
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an HF transformer having a desired frequency range of operation, and having a first port and a second port; a first modulator coupled to the first port of said transformer through a first HF circuit, said first modulator modulating a first base band signal to a first pass band signal within said desired frequency range such that integer multiples of two or greater of frequencies of the first pass band signal fall outside of the disired frequency range of the HF transformer, and transmitting the first pass band signal to said HF transformer; a first demodulator coupled to said second port of said transformer through a second HF circuit, said demodulator demodulating said first pass band signal to recover said first base band signal for transmission to said line side circuit. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32)
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33. An electrical isolation barrier for use in a data access arrangement for providing electrical isolation between a system side circuit and a line side circuit, comprising, in combination:
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an HF transformer having a desired frequency range of operation, and having a first port and a second port; a first modulator coupled to first port of said transformer, said first modulator modulating a first 1-bit digital signal to a first pass band signal within said desired frequency range such that integer multiples of two or greater of frequencies of the shifted signal fall outside of the frequency range of the transformer, and transmitting the modulated first pass band signal to said HF transformer; a first demodulator coupled to said second port of said transformer, said demodulator demodulating said first pass band signal to recover said first 1-bit digital signal for transmission to said line side circuit. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
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50. An electrical isolation barrier for use in a data access arrangement for providing electrical isolation between a system side circuit and a line side circuit, comprising, in combination:
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an HF isolation element having a desired frequency range of operation, and having a first port and a second port; a first modulator coupled to the first port of said isolation element through a first HF circuit, said first modulator modulating a first base band signal to a first pass band signal within said desired frequency range such that integer multiples of two or greater of frequencies of the first pass band signal fall outside of the frequency range, and transmitting the modulated signal to said isolation element; a first demodulator coupled to said second port of said isolation element through a second HF circuit, said demodulator demodulating said first pass band signal to recover said first base band signal for transmission to said line side circuit; a second modulator coupled to said second port of said isolation element through said second HF circuit, said second modulator modulating a second base band signal to a second pass band signal within said desired frequency range such that integer multiples of two or greater of frequencies of the shifted signal fall outside of the frequency range, and transmitting it to said isolation element; a second demodulator coupled to said first port of said isolation element through said first HF circuit, said second demodulator demodulating said second pass band signal to recover said second base band signal for transmission to said system side circuit.
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51. An electrical isolation barrier for use in a data access arrangement, comprising, in combination:
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an HF transformer for providing electrical isolation between an input circuit and an output circuit and having a frequency range of desired operation, said transformer having a first port and a second port ports; a modulator and high frequency circuit combination capable of bidirectional operation and having an input and an output, said modulator input capable of being connected to the input circuit, said modulator modulating the input signal to frequencies within the frequency range of the transformer such that integer multiples of two or greater of frequencies of the modulated input signal fall outside of the frequency range of the transformer; said modulator output coupled to the first port of the transformer to supply the modulated signals to the transformer; a demodulator and high frequency circuit combination capable of bidirectional operation having an input and an output, said demodulator input coupled to the second port of the transformer, said demodulator demodulating signals from the frequency range of the transformer to an output signal for use by the output circuit. - View Dependent Claims (52)
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53. The method of providing an electrical isolation barrier in a modem system comprising the steps of:
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providing a single high frequency transformer in the data access arrangement section of the modem, which transformer has a predetermined frequency operation range and an input port and an output port, and delivers both signal and power; providing a power deriving circuit to derive power from a modulated signal; shifting an input signal to a bandpass signal within the frequency operation range of the transformer such that integer multiples of two or greater of frequencies of the shifted signal fall outside of the frequency range of the transformer, and providing the shifted first signal to the transformer input port; obtaining from the output port of the transformer an output signal; utilizing said power deriving circuit to derive power from said first modulated shifted signal; and shifting the frequency of the output signal to recover the input signal.
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Specification