Amplitude and phase demodulation circuit for signals with very low modulation index
First Claim
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1. An amplitude and phase demodulator circuit for signals with very low modulation index, comprising:
- amplifier means adapted to amplify a modulated signal coming from a transmitter, said modulated signal being composed by a carrier and by a modulating component;
means adapted to cancel said carrier from said modulated signal;
said means adapted to cancel the carrier receiving as an input the output signal of said amplifier means and a sync signal coming from said transmitter, the output signal of said amplifier means being delivered to receiver means;
wherein said means adapted to cancel said carrier comprises a synchronous resonator adapted to generate a carrier signal to be subtracted from said modulated signal output from said transmitter.
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Abstract
An amplitude and phase demodulator circuit for signals with very low modulation index, including: amplifier circuitry adapted to amplify a modulated signal coming from a transmitter, the modulated signal being composed by a carrier and by a modulating component, circuitry adapted to cancel said carrier from said modulated signal; the circuitry adapted to cancel the carrier receiving in input the output signal of the amplifier circuitry and a sync signal coming from the transmitter, the output signal of the amplifier circuitry being delivered to receiver circuitry.
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Citations
43 Claims
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1. An amplitude and phase demodulator circuit for signals with very low modulation index, comprising:
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amplifier means adapted to amplify a modulated signal coming from a transmitter, said modulated signal being composed by a carrier and by a modulating component;
means adapted to cancel said carrier from said modulated signal;
said means adapted to cancel the carrier receiving as an input the output signal of said amplifier means and a sync signal coming from said transmitter, the output signal of said amplifier means being delivered to receiver means;
wherein said means adapted to cancel said carrier comprises a synchronous resonator adapted to generate a carrier signal to be subtracted from said modulated signal output from said transmitter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for amplitude and phase demodulating signals with very low modulation index comprising the steps of:
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subtracting from a modulated signal, output from a transmitter, a carrier signal generated using a means adapted to cancel the carrier, to obtain a pre-processed signal;
amplifying said pre-processed signal; and
feeding back to said means adapted to cancel the carrier a signal obtained by said amplifying step, to derive an output signal to be delivered to a receiver;
wherein said step of using the means adapted to cancel the carrier includes using a synchronous resonator receiving as an input the signal derived from said amplifying step and a sync signal output from said transmitter. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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22. An amplitude and phase demodulator circuit, comprising:
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a transmitter;
an amplifier adapted to amplify a modulated signal derived from said transmitter;
said modulated signal being composed by a carrier and a modulating component;
a synchronous resonator adapted to cancel the carrier from said modulated signal;
said synchronous resonator having one input connected to and for receiving the output signal, from said amplifier and another input connected to and for receiving a sync signal from said transmitter;
and a receiver connected to and for receiving the output signal from said amplifier. - View Dependent Claims (23, 24, 25, 26)
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27. An amplitude and phase demodulator circuit, comprising:
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a transmitter;
an amplifier adapted to amplify a modulated signal derived from said transmitter;
said modulated signal being composed of a carrier and a modulating component;
a low pass filter amplifier receiving as an input a sample and hold signal derived from said modulating signal;
an integrator which receives as an input a feed-back signal from said low-pass filter amplifier;
and a receiver connected to and for receiving the output signal from said amplifier. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35)
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36. A method for amplitude and phase demodulating signals with very low modulation index, comprising the steps of:
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providing a modulated signal, output from a transmitter;
providing a carrier signal;
subtracting the carrier signal from the modulated signal so as to cancel the carrier and obtain a pre-processed signal;
amplifying said pre-processed signal;
providing a receiver;
delivering the amplified signal to said receiver;
wherein said amplifying step is followed by a mixing step in which said output signal from the amplifying step and a sync signal output from said transmitter are added and the resulting signal is subjected to a low-pass filtering step. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43)
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Specification