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DIFFERENTIAL AMPLIFIER CIRCUIT AMPLIFYING DIFFERENTIAL SIGNALS WITH SELECTIVELY SWITCHING BETWEEN DIFFERENTIAL SIGNALS AND AD CONVERTER APPARATUS
DIFFERENTIAL AMPLIFIER CIRCUIT AMPLIFYING DIFFERENTIAL SIGNALS WITH SELECTIVELY SWITCHING BETWEEN DIFFERENTIAL SIGNALS AND AD CONVERTER APPARATUS
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机译:差分放大器电路,通过差分信号和AD转换器之间的选择性切换来放大差分信号
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摘要
A differential amplifier circuit is provided with an operational amplifier and a modulator. The operational amplifier includes a feedback capacitance, and amplifies an analog input signal and outputs an amplified analog output signal. The modulator is connected to a virtual ground point of an input terminal of the operational amplifier, and the modulator switches between a pair of inputted analog differential signals to alternately select one of the analog differential signals based on a predetermined modulation control signal, and outputs a selected analog differential signal. The differential amplifier circuit alternately folds and amplifies the analog input signal within a predetermined input level limit range to generate a signal having different polarities sequentially so as to start from a voltage potential of the virtual ground point at a timing of the modulation control signal. In addition, an converter apparatus is provided with the differential amplifier circuit.
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