AMPLIFIER CIRCUIT INCLUDING SINGLE CAPACITOR FOR DC DIFFERENTIAL-INPUT BALANCE

摘要

In an amplifier circuit, there are provided a preamplifier, a first differential-input amplifier and a second differential-input amplifier. An AC negative feedback path is formed betwenn the output terminal of the preamplifier and the inverting input terminal thereof. The inverting input terminal is connected to a ground via a RC series circuit. An input signal containing a DC voltage component is supplied via the junction of the RC series circuit to the inverting input terminal. A voltage appearing at this junction is applied to both the first and second differetial-input amplifiers as a reference voltage.