Fully differential demodulator with variable gain, and method for demodulating a signal
First Claim
Patent Images
1. A demodulator, comprising:
- input terminals, for receiving an amplitude-modulated input signal, defined by a carrier signal at a carrier frequency and by a modulating signal;
an amplifier stage having a gain; and
a gain-control stage coupled to the amplifier stage and configured to vary the gain of the amplifier stage according to a sinusoid of a frequency equal to the carrier frequency on the basis of the carrier signal.
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Abstract
A demodulator includes input terminals, for receiving an input signal, and an amplifier stage having a gain. The input signal is amplitude-modulated and is defined by a carrier signal at a carrier frequency and by a modulating signal. The demodulator includes, moreover, a gain-control stage, coupled to the amplifier stage for varying the gain of the amplifier stage according to a sinusoid of a frequency equal to the carrier frequency, on the basis of the carrier signal.
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Citations
26 Claims
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1. A demodulator, comprising:
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input terminals, for receiving an amplitude-modulated input signal, defined by a carrier signal at a carrier frequency and by a modulating signal; an amplifier stage having a gain; and a gain-control stage coupled to the amplifier stage and configured to vary the gain of the amplifier stage according to a sinusoid of a frequency equal to the carrier frequency on the basis of the carrier signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. 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 a sinusoid of a frequency equal to the carrier frequency on the basis of the carrier signal. - View Dependent Claims (15, 16, 17, 18)
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19. A circuit, comprising:
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a variable gain amplifier stage receiving an amplitude modulated signal and generating an output signal having a gain; and a gain control stage coupled to the variable gain amplifier stage, the gain control stage receiving as input a carrier signal of the amplitude modulated signal and generating in response thereto a gain control signal to control the gain of the variable gain amplifier stage in response to a carrier frequency of the carrier signal and bring the amplitude modulated signal into a base band in the output signal. - View Dependent Claims (20, 21, 22)
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23. An electronic apparatus, comprising:
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a gyroscope device generating a modulated signal, the gyroscope device comprising two movable masses and a read interface, the modulated signal comprising a discrete-time analog voltage given by the product of a modulating signal and a carrier signal having a carrier frequency, the carrier frequency comprising a mechanical resonance frequency of the gyroscope device 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 sign-inverting circuit cascaded to a variable gain amplifier stage and having a first input, a second input, a first output, and a second output and wherein, in a first operating configuration, the first input and the second input are connected to the first output and to the second output, respectively, and, in a second operating configuration, the first input and the second input are connected to the second output and to the first output, respectively. - View Dependent Claims (24, 25, 26)
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Specification