Patent ID: 6593813
Filing Date: 2003-07-15
Classification: H03F

Abstract:
A negative feed-back amplifier comprising:a phase inverter amplifier for amplifying an input signal, said input signal being provided through an input terminal, and for producing a reversed signal of a phase opposite to said input signal and for producing a non-reversed signal in phase with said input signal; a push-pull output circuit comprising at least two transistors having emitters, said push-pull output circuit for producing an output signal of a phase opposite to said input signal by inputting both said reversed signal and said non-reversed signal; a negative feed-back circuit for producing a negative feed-back signal by inputting said output signal, said negative feedback circuit being connected to said input terminal and to both said emitters; wherein said negative feed-back circuit is provided with a feedback ratio setting circuit for attenuating said output signal at a predetermined feedback ratio and for producing said negative feed-back signal.