Temperature compensated oscillation circuit

Details Temperature compensated oscillation circuit Temperature compensated oscillation circuit

1991-05-17

1992-09-29

Mis, David

Oscillators

Solid state active element oscillator

Transistors

331176, H03B 504, H03B 512, H03L 102

Patent

active

051516675

ABSTRACT:
An oscillation circuit has a differential amplifier including a constant current source formed by a resistor and a transistor whose emitter is grounded through the resistor, and a feedback circuit through which an output of the differential amplifier is positively fed back to an input of the same differential amplifier. The oscillation circuit further includes a band-gap regulator for producing a band-gap voltage proportional to a thermal voltage of transistors forming the band-gap regulator whose emitter areas are different with each other, and an operational amplifier for DC-amplifying the band-gap voltage and applying the amplified band-gap voltage to the base of the transistor forming the constant current source. The oscillation circuit is capable of performing a stable oscillation against a wide range of temperature changes.

REFERENCES:
patent: 4063193 (1977-12-01), Wilcox
patent: 4270102 (1981-05-01), Gawler et al.
patent: 4833426 (1989-05-01), Robichon et al.
patent: 4884042 (1989-11-01), Menon et al.
patent: 4978930 (1990-12-01), Suter

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