Low-power demodulating receiver with amplifier stages sharing the same bias current
First Claim
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1. A receiver which is part of a transmitter/receiver pair for extracting a digital data signal from an amplitude carrier signal produced by the transmitter, wherein the amplitude modulated carrier signal is a pulse stream modulated in on-off fashion by the digital data signal, comprising:
- an amplifier for amplifying the amplitude modulated carrier signal;
means for filtering the output of the amplifier to remove the carrier signal and output one of two voltage levels to represent the extracted data signal;
wherein the amplifier comprises a plurality of amplifier stages with each stage having a signal input terminal, a signal output terminal, a bias current input terminal, and a bias current output terminal;
wherein the bias current input and output terminals of the amplifier stages are connected together in series so that each of the stages shares the same bias current.
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Abstract
A low-power receiver for extracting a digital data signal from a modulated carrier signal is disclosed. The receiver employs an amplifier whose stages share the same bias current in order to reduce power consumption.
122 Citations
15 Claims
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1. A receiver which is part of a transmitter/receiver pair for extracting a digital data signal from an amplitude carrier signal produced by the transmitter, wherein the amplitude modulated carrier signal is a pulse stream modulated in on-off fashion by the digital data signal, comprising:
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an amplifier for amplifying the amplitude modulated carrier signal; means for filtering the output of the amplifier to remove the carrier signal and output one of two voltage levels to represent the extracted data signal; wherein the amplifier comprises a plurality of amplifier stages with each stage having a signal input terminal, a signal output terminal, a bias current input terminal, and a bias current output terminal; wherein the bias current input and output terminals of the amplifier stages are connected together in series so that each of the stages shares the same bias current. - View Dependent Claims (2, 7, 8)
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- 3. The receiver as set forth in claim 3 wherein the input signal to each amplifier stage is the voltage difference between the bias current output terminal and the signal input terminal, and wherein the output signal from each amplifier stage is the voltage difference between the bias current output terminal and the signal output terminal, and further wherein the bias current output terminal of each amplifier stage is capacitively coupled to a constant potential to thereby provide an AC ground.
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9. A receiver which is part of a transmitter/receiving pair for extracting a digital data signal from a modulated carrier signal produced by the transmitter, comprising:
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an amplifier for amplifying the modulated carrier signal; means for demodulating the modulated carrier signal; wherein the amplifier comprises a plurality of amplifier stages with each stage having a signal input terminal, a signal output terminal, a bias current input terminal, and a bias current output terminal; wherein the bias current input and output terminals of the amplifier stages are connected together in series so that each of the stages shares the same bias current. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification