Fully differential demodulator with variable gain, and method for demodulating a signal
First Claim
Patent Images
1. A demodulator for an amplitude-modulated input signal defined by a carrier signal having a carrier frequency modulated by a modulating signal, the demodulator comprising:
- an amplifier stage having a gain and structured to receive the amplitude-modulated input signal; and
a gain-control stage coupled to the amplifier stage and configured to vary the gain of the amplifier stage according to the carrier frequency of the carrier signal.
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Abstract
A demodulator is provided for demodulating an amplitude-modulated input signal defined by a carrier signal having a carrier frequency modulated by a modulating signal, the demodulator including an amplifier stage having a gain and structured to receive the amplitude-modulated input signal, and a gain control stage coupled to the amplifier stage and configured to vary the gain of the amplifier stage according to the carrier frequency of the carrier signal.
14 Citations
26 Claims
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1. A demodulator for an amplitude-modulated input signal defined by a carrier signal having a carrier frequency modulated by a modulating signal, the demodulator comprising:
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an amplifier stage having a gain and structured to receive the amplitude-modulated input signal; and a gain-control stage coupled to the amplifier stage and configured to vary the gain of the amplifier stage according to the carrier frequency of the carrier signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for demodulation of a signal, comprising:
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receiving an amplitude-modulated input signal, defined by a carrier signal at a carrier frequency and a modulating signal; and amplifying the input signal with a gain that is varied according to the carrier frequency of the carrier signal. - View Dependent Claims (14, 15, 16, 17)
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18. A circuit, comprising:
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a variable gain amplifier stage adapted to receive an amplitude modulated signal and to generate an output signal having a gain; and a gain control stage coupled to the variable gain amplifier stage, the gain control stage adapted to receive as input a carrier signal of the amplitude modulated signal and to generate a gain control signal to control the gain of the variable gain amplifier stage in response to a frequency of the carrier signal and to bring the amplitude modulated signal into a baseband in the output signal. - View Dependent Claims (19, 20, 21)
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22. A gyroscopic apparatus, comprising:
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a gyroscope device generating a modulated signal, the gyroscope device comprising two microstructure movable masses and a read interface, the modulated signal comprising a discrete-time analog voltage given by a product of a modulating signal and a carrier signal having a carrier frequency, the carrier frequency comprising a mechanical resonance frequency of the two movable masses and an amplitude modulation that is proportional to an angular velocity of the gyroscope device; and a demodulator of the discrete-time analog type, the demodulator comprising; a variable gain amplifier stage adapted to receive an amplitude modulated signal and to generate an output signal having a gain; and a gain control stage coupled to the variable gain amplifier stage, the gain control stage adapted to receive as input a carrier signal of the amplitude modulated signal and to generate a gain control signal to control the gain of the variable gain amplifier stage in response to a frequency of the carrier signal and to bring the amplitude modulated signal into a baseband in the output signal. - View Dependent Claims (23, 24, 25, 26)
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Specification