Importance

Loading Importance Indicators...

Abstract

A tuned amplifier that can be produced easily in an integrated circuit and by which the tuning frequency and the maximum damping are arbitrarily adjusted without mutual interference. The tuned amplifier is constituted of two phase shifting circuits (10C, 30C) each of which comprises a first serial circuit consisting of two resistors for dividing the voltage of the inputted AC signal to obtain a signal of half the voltage of the inputted signal, a second serial circuit consisting of a capacitor and a variable resistor for shifting the phase of the inputted signal by a predetermined angle, and a differential amplifier for amplifying the difference between the outputs of the first and second serial circuits, a noninverting circuit (50) connected to the input of the phase shifting circuit (10C) of the first stage, and an adding circuit which adds signals outputted from the phase shifting circuit (30C) of the second stage and input signals inputted to an input terminal (90) at a specific rate through a feedback resistor (70) and an input resistor (74).

Loading the Abstract Image...

First Claim