Patent ID: 6229405
Filing Date: 2001-05-08
Classification: H03K

Abstract:
A low voltage oscillation amplifying circuit, comprising:a switching circuit including first and second insulated gate field effect transistors of the same conductivity type being connected in series and having gate electrodes connected to each other;an amplifying circuit connected to said switching circuit and including a third insulated gate field effect transistor of a first conductivity type and a fourth insulated gate field effect transistor of a second conductivity type, drain electrodes of said third and fourth insulated gate field effect transistors being connected to each other to provide a common drain electrode, and gate electrodes of said third and fourth insulated gate field effect transistors being connected to each other to provide a common gate electrode;a feedback resistor connected between said common gate electrode and said common drain electrode of said third and fourth insulated gate field effect transistors;a control circuit including a control signal terminal and an inverter circuit for outputting an inverted signal obtained by inverting a control signal inputted to said control signal terminal;a power source of a first polarity connected to said switching circuit; anda power source of a second polarity connected to said amplifying circuit;wherein a body of each of said third and fourth insulated gate field effect transistors is insulatively isolated, a voltage of said body of said fourth insulated gate field effect transistor is controlled by said control signal of said control circuit, and a voltage of said body of said third insulated gate field effect transistor is controlled by said inverted signal.