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.
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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