Fully integrated data receiver and method for receiving on/off keyed AM/PDSK modulated signals
First Claim
1. A data transmission system comprising a transmitter for transmitting an on/off keyed (OOK) AM/DPSK modulated data signal with an on/off ratio exceeding about 60 dB which has been modulated on a carrier;
- and a compact data receiver which operates without automatic gain control comprising,an antenna comprising a double loop of antenna wire, the loop being less than about three inches in diameter, and a trimmer capacitor which is connected to a center of said wire for providing a conjugate impedance match between said antenna and a low noise amplifier connected thereto;
a square-law detection AM demodulator for demodulating the amplified signal from said low noise amplifier; and
a DPSK data detector circuit for digitally decoding the demodulated signal in order to provide the data signal as an output.
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Accused Products
Abstract
A data transmission system in which an on/off keyed (OOK) AM/DPSK modulated data signal with an on/off ratio exceeding about 80 dB which has been modulated on a carrier is received at a compact, easily fabricated and battery powered data receiver which operates without automatic gain control and which includes a double loop antenna (diameter of about two inches) with a trimmer capacitor center tapped to the antenna for providing a conjugate impedance match between the antenna and a low noise amplifier. In the receiver, a square-law detection AM demodulator for demodulating the amplified signal is in a bipolar silicon IC, and a DPSK data detector for decoding the demodulated signal is in a separate digital CMOS IC.
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Citations
22 Claims
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1. A data transmission system comprising a transmitter for transmitting an on/off keyed (OOK) AM/DPSK modulated data signal with an on/off ratio exceeding about 60 dB which has been modulated on a carrier;
- and a compact data receiver which operates without automatic gain control comprising,
an antenna comprising a double loop of antenna wire, the loop being less than about three inches in diameter, and a trimmer capacitor which is connected to a center of said wire for providing a conjugate impedance match between said antenna and a low noise amplifier connected thereto; a square-law detection AM demodulator for demodulating the amplified signal from said low noise amplifier; and a DPSK data detector circuit for digitally decoding the demodulated signal in order to provide the data signal as an output. - View Dependent Claims (2, 3, 4, 5)
- and a compact data receiver which operates without automatic gain control comprising,
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6. A data communication method comprising the steps of:
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(a) DPSK modulating an input data signal; (b) on/off keying the DPSK modulated signal at a first AM rate with an on/off ratio of at least 60 dB, to produce an OOK AM/DPSK signal; (b) modulating the OOK AM/DPSK signal onto a carrier; (c) transmitting the modulated carrier; (d) providing a conjugate impedance match between a double loop wire antenna receiving the transmitted signal and a low noise amplifier connected thereto, the antenna being center tapped to a trimmer capacitor for impedance matching; (e) demodulating the signal from the low noise amplifier with a square-law detection AM demodulator in a bipolar silicon integrated circuit; and (f) decoding the demodulated signal with DPSK data detector circuit in a digital CMOS integrated circuit which delays data in the demodulated signal by one bit and multiplies the delayed data times the undelayed demodulated signal. - View Dependent Claims (7, 8, 9, 10)
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11. A data receiver comprising:
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an antenna comprising a double loop of antenna wire center tapped to a trimmer capacitor, said antenna for receiving an on/off keyed (OOK) AM/DPSK modulated several hundred Hertz data signal with an on/off ratio exceeding about 60 dB which has been modulated on a multi-megaHertz carrier, and for providing a conjugate impedance match between said antenna and a low noise amplifier connected thereto; an AM demodulator circuit comprising a bipolar silicon integrated circuit having therein said low noise amplifier for amplifying the signal from said antenna and a square-law detection AM demodulator for demodulating the amplified signal; and a DPSK data detector circuit comprising a digital CMOS integrated circuit having therein delay means for delaying data in the demodulated signal by one bit and a multiplier for decoding the demodulated signal by multiplying the delayed signal times the undelayed demodulated signal, said data detector circuit for providing the several hundred Hertz data signal as an output. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A data transmission system comprising a transmitter for transmitting an on/off keyed (OOK) AM/DPSK modulated data signal which has been modulated on a carrier;
- and a compact data receiver which operates without automatic gain control comprising,
an antenna comprising a double loop of antenna wire and a trimmer capacitor which is connected to a center of said wire for providing a conjugate impedance match between said antenna and a low noise amplifier connected thereto; a square-law detection AM demodulator for demodulating the amplified signal from said low noise amplifier; and a DPSK data detector circuit for digitally decoding the demodulated signal in order to provide the data signal as an output. - View Dependent Claims (19, 20, 21, 22)
- and a compact data receiver which operates without automatic gain control comprising,
Specification