Dual mode voltage reference circuit and method

Details Dual mode voltage reference circuit and method Dual mode voltage reference circuit and method

1989-10-05

1990-06-12

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307360, 323313, 341121, H03K 301, H03M 100

Patent

active

049335723

ABSTRACT:
A voltage reference circuit is described which is capable of providing either an internally generated voltage having a trimming capability, or an externally generated voltage, with the use of only two pins. The internal voltage is connected through an interrupt circuit to an input/output terminal, which can also receive an externally generated voltage. A trimming terminal is used to apply trimming voltage signals to adjust the internally generated voltage. To convert from the internal to the external voltage source, an interrupt voltage is applied to the trimming terminal which is outside of the normal trimming voltage range. This interrupt voltage actuates an interrupt circuit to interrupt the connection between the internal voltage source and input/output terminal, leaving the output terminal available for the external voltage source.

REFERENCES:
patent: 4131884 (1978-12-01), Comer
patent: 4254406 (1981-03-01), Meares
patent: 4415881 (1983-11-01), Lechner et al.
patent: 4613768 (1986-09-01), Pommer, II
patent: 4634894 (1987-01-01), Shu et al.

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