Trimming circuit

Details Trimming circuit Trimming circuit

1989-07-21

1991-09-10

Miller, Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

3072961, 357 51, H03K 326, H03K 3335

Patent

active

050476645

ABSTRACT:
There is disclosed a trimming circuit for use in integrated circuits for adjusting a circuit parameter to a desired level. The trimming circuit includes an input terminal and a fuse coupled between the input terminal and a supply voltage. The fuse is convertible from a low resistance condition to an open circuit condition in response to a first voltage potential applied to the input. The trimming circuit also includes circuit means coupled to the input for causing the circuit parameter to be permanently adjusted in response to the fuse being converted to the open circuit condition and is also responsive to a second voltage potential applied to the input for causing the circuit parameter to be temporarily adjusted without the fuse being converted to the open circuit condition. With the application of the second voltage potential, the appropriateness of the circuit parameter adjustment may be determined before the fuse is converted to the open circuit condition and hence, before the circuit parameter is permanently adjusted.

REFERENCES:
patent: 4104546 (1978-08-01), Seiler
patent: 4532607 (1985-07-01), Uchida
patent: 4593203 (1986-06-01), Iwahashi et al.
patent: 4797578 (1989-01-01), Eriksson

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