5results about "Dc amplifiers with modulator-demodulator" patented technology

A signal processing device and a signal transceiver device are provided. The signal processing device includes a first amplifier, two first choppers, a second chopper, and a third chopper. The first amplifier is configured to generate a second signal from a first signal. The two first choppers are embedded between an input and an output of the first amplifier and are configured to perform a first frequency shift and a first frequency shift back, respectively. The second chopper is coupled to the input of the first amplifier and is configured to perform a second frequency shift. The third chopper is coupled to the output of the first amplifier and is configured to perform a second frequency shift back. The first frequency and the second frequency are different.

This application relates to methods and apparatus for clipping prevention. A driver apparatus for driving a load with an output signal has a switching driver with a switch network and a modulator configured to control the switch network to switch output nodes between different switching voltages with a controlled duty-cycle. A quantizer controller receives a quantizer input signal based on an input signal and a feedback signal and controls the duty-cycle of the switch network. A clipping prevention controller is configured to control a gain applied to the input signal so as to provide limiting of the input signal to avoid clipping, wherein the clipping prevention controller is configured to dynamically control at least one limiting threshold used to determine when to apply limiting of the input signal based on an indication of said quantizer input signal.

An optical light sensing device includes a detector operable to detect a light wave. The optical light sensing device also includes an integration circuit that includes an operational amplifier that is operable to reduce or cancel dark currents generated at the detector.

A sensor readout system (100) is provided. The sensor readout system (100) comprises a signal generator (101) configured to generate a biasing signal (102), a first chopper (103) configured to modulate the biasing signal (102) using a chopping signal (117) with a chopping frequency fchop to generate a modulated biasing signal (104) . It also comprises a Wheatstone bridge circuit (105) comprising four resistive branches (R1, R2, R3, R4), at least one of the four resistive branches comprises an impedance-based sensor (Rs1, Rs2, Rs3). The Wheatstone bridge circuit (105) is configured to receive the modulated biasing signal (104) and to generate a sensing signal (106) based on the modulated biasing signal (104). A second chopper (107) is configured to modulate the sensing signal (106) using the chopping signal (117) with the chopping frequency fchop to generate a modulated sensing signal (108) .

A signal processing device and a signal transcciving device are provided. The signal processing device includes a first amplifier, two first choppers, a second chopper, and a third chopper. The first amplifier is configured to generate a second signal according to a first signal. The two first choppers are embedded between an input end and an output end of the first amplifier and respectively configured to perform a shifting operation of a first frequency and a shifting back operation of the first frequency. The second chopper is coupled to the input end of the first amplifier and configured to perform a shifting operation of a second frequency. The third chopper is coupled to the output end of the first amplifier and configured to perform a shifting back operation of the second frequency. The first frequency and the second frequency are different.