Fully differential demodulator with variable gain, and method for demodulating a signal
AssigneeSTMicroelectronics S.r.l.
InventorsLuciano Prandi, Carlo Caminada, Paolo Invernizzi
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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.
Claims26
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.
A method for demodulation of a signal, comprising:
- 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.
A circuit, 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.
A gyroscopic apparatus, comprising:
- 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.
Dependencies are inferred from the claim text.