Substantially temperature-independent trimming of current flows

Details Substantially temperature-independent trimming of current flows Substantially temperature-independent trimming of current flows

1979-05-08

1981-01-06

Dixon, Harold A.

Amplifiers

With semiconductor amplifying device

Including temperature compensation means

307229, 307296R, 307310, 330288, H03F 304

Patent

active

042439485

ABSTRACT:
A current I of predetermined temperature coefficient is supplied to the series connection of at least one semiconductor diode and a positive-temperature-coefficient resistance. This resistance is of such value that a voltage drop with a temperature-coefficient equal to that of I, in terms of percentage change per degree of temperature change, appears across the series connection. A relatively large, zero-temperature-coefficient, adjustable resistance, alone or in series with a zero-temperature-coefficient voltage source, parallels the series connection. Adjustment of the relatively large zero-temperature-coefficient resistance provides a trim for the current flow in the series connection, which trim is substantially unaffected by changing temperature.

REFERENCES:
patent: 3050644 (1962-08-01), Ironside
patent: 3268739 (1966-08-01), Dickson
patent: 3430076 (1969-02-01), Overtveld
patent: 3531655 (1970-09-01), Taylor
patent: 4055811 (1977-10-01), Wheatley

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