Function generator

Details Function generator Function generator

1996-09-26

1998-02-17

Mis, David

Oscillators

Frequency stabilization

Temperature or current responsive means in circuit

331158, 310315, 327512, 327513, H03B 504, H03B 532, H03K 3011

Patent

active

057195331

ABSTRACT:
In order to realize highly accurate temperature compensation of a crystal oscillation frequency, a current in proportion to the cube of a difference between an ambient temperature T.sub.a and a reference temperature T.sub.0 is generated. For this purpose, provided are a first series circuit of two diodes; a second series circuit of three diodes; a third series circuit of two diodes; a fourth series circuit of three diodes; a current source for allowing a constant current to flow into the first series circuit; a current source for allowing a constant current to flow from the third series circuit; a current source for allowing a current in proportion to T.sub.a -T.sub.0 to flow into the second series circuit when T.sub.a .gtoreq.T.sub.0 and allowing a current in proportion to .vertline.T.sub.a -T.sub.0 .vertline. to flow from the fourth series circuit when T.sub.a <T.sub.0 ; an NPN transistor and a PNP transistor whose collectors are connected with an output terminal; and two operational amplifiers for applying a voltage between the anode terminals of the first and second series circuits between the base and the emitter of the NPN transistor and for applying a voltage between the cathode terminals of the third and fourth series circuits between the base and the emitter of the PNP transistor, respectively.

REFERENCES:
patent: 4978930 (1990-12-01), Suter
patent: 5422832 (1995-06-01), Moyal
patent: 5434533 (1995-07-01), Furutani
patent: 5546041 (1996-08-01), Szajda
Hidehiko Aoki, "An Introduction to Functional Circuit Design of Analog IC", CQ Publishing CO., Ltd, pp. 187-200, 1992.

Affiliated with

Also associated with

Rating

Function generator does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Function generator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Function generator will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1787145