Operational amplifier with junction field effect transistors as

Details Operational amplifier with junction field effect transistors as Operational amplifier with junction field effect transistors as

1992-12-23

1995-02-28

Mottola, Steven

Amplifiers

With periodic switching input-output

330300, H03F 102

Patent

active

053941110

ABSTRACT:
In an operational amplifier circuit, noise is lowered by using junction FETs as an input transistor pair, and an input operating point and an output operating point can be set at different potentials by connecting a capacitor between an output terminal and an inverting input terminal. For this reason, the operational amplifier circuit can be properly biased and can be operated at a low power supply voltage. In addition, since transistors other than transistors used as constant current sources are constituted by bipolar transistors, the operational amplifier circuit can have wideband frequency characteristics.

REFERENCES:
patent: 4135162 (1979-01-01), Takahashi
patent: 4783602 (1988-11-01), Viswanathan
patent: 5068622 (1991-11-01), Mead et al.
Roettcher, "A Compatible CMOS-JFET Pulse Density Modulator for Interpolative High-Resolution A/D/Conversion", IEEE Journal of Solid-State Circuits, vol. SC-21, No. 3, Jun. 1986.

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