Amplifier circuit having feedback circuit

H - Electricity – 03 – F

Patent

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330/13

H03F 1/26 (2006.01) H03F 1/34 (2006.01) H03G 3/34 (2006.01)

Patent

CA 2035820

ABSTRACT OF THE DISCLOSURE An amplifier circuit includes a high-gain amplifier, and a feedback circuit for extracting an unstable output having a level equal to or less than a threshold level from an amplified signal from the amplifier and for feeding back the unstable signal to the amplifier, so that the amplifier oscillates at a predetermined oscillation frequency. The amplifier circuit also includes a band rejection filter for passing signal components of the amplified signal other than an oscillation output which is obtained at the output terminal of the amplifier when the amplifier oscillates at the predetermined oscillation frequency. The signal components obtained from the band rejection filter are an output signal of the amplifier circuit.

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