System and method for receiving analog and digital signals
First Claim
Patent Images
1. A system for receiving a transmitted signal comprising:
- an image reject mixer receiving the transmitted signal and generating a received signal;
a first receiver coupled to the image reject mixer, converting the received signal to a phase-corrected received signal and decoding the phase-corrected received signal according to a first demodulation format; and
a second receiver coupled to the image reject mixer, decoding the received signal according to a second demodulation format.
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Abstract
A system for receiving a transmitted signal is provided. The system includes a first receiver that can receive the transmitted signal and decode the transmitted signal according to a first demodulation format, such as a CDMA or PCS format. A second receiver, such as an FM demodulator, is connected to the first receiver at a suitable location, such as after initial signal amplification and processing has been completed. The second receiver can decode the transmitted signal according to a second demodulation format, such as AMPS.
36 Citations
20 Claims
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1. A system for receiving a transmitted signal comprising:
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an image reject mixer receiving the transmitted signal and generating a received signal;
a first receiver coupled to the image reject mixer, converting the received signal to a phase-corrected received signal and decoding the phase-corrected received signal according to a first demodulation format; and
a second receiver coupled to the image reject mixer, decoding the received signal according to a second demodulation format. - View Dependent Claims (2, 3, 4, 5, 6)
an amplifier receiving the transmitted signal and amplifying the transmitted signal; and
a surface acoustic wave filter receiving the amplified transmitted signal and providing a filtered, amplified transmitted signal to the image reject mixer.
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4. The system of claim 1 wherein the image reject mixer further comprises:
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a first band pass filter receiving the transmitted signal and passing signals having a frequency associated with the first demodulation format and the second demodulation format;
an amplifier receiving the filtered transmitted signal and amplifying the filtered transmitted signal; and
a second band pass filter receiving the amplified and filtered transmitted signal and providing a filtered, amplified and filtered transmitted signal to the image reject mixer.
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5. The system of claim 1 further comprising:
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an analog format filter coupled between the image reject mixer and the first receiver and filtering the received signal in accordance with an analog format; and
a digital format filter coupled between the image reject mixer and the second receiver and filtering the received signal in accordance with a digital format.
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6. The system of claim 1 wherein the first receiver coupled to the image reject mixer, converting the received signal to the phase-corrected received signal and decoding the phase-corrected received signal according to the first demodulation format comprises:
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a phase shifter coupled to the image reject mixer introducing a phase shift to compensate for the image reject mixer; and
the first receiver coupled to the phase shifter and decoding the phase-shifted received signal according to the first demodulation format.
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7. A system for receiving a transmitted signal comprising:
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a first receiver converting the transmitted signal to an in-phase received signal and a quadrature-phase received signal according to a first demodulation format;
a phase shifter combining the in-phase received signal and the quadrature-phase received signal and shifting the combined signal; and
a second receiver receiving the combined signal from the phase shifter and generating a second received signal according to a second demodulation format. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method for receiving a transmitted signal comprising:
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image reject mixing the transmitted signal to generate a received signal;
demodulating the received signal according to a first demodulation format;
correcting a phase shift of the received signal; and
demodulating the corrected received signal according to a second demodulation format. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification