Temperature-independent current trimming arrangement

Details Temperature-independent current trimming arrangement Temperature-independent current trimming arrangement

1981-02-02

1982-12-28

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330253, 330257, 330261, H03F 130, H03F 345, H03F 316

Patent

active

043664440

ABSTRACT:
A current amplifier includes six transistors of like conductivity on a substrate, the first and second transistors being diode-connected to receive input current, and the third and fourth having their main conduction paths serially connected with those of the first and second transistors, respectively. The gates of the third and fourth transistors are cross coupled with their drains. The gate-source connections of the fifth and sixth transistors are respectively connected in parallel with the gate-source connections of the third and fourth transistors. A potentiometer connects the respective sources of the third and fourth transistors to a common terminal for adjusting the relative portion of the input current in the aforementioned main conduction paths, thereby to proportionally adjust the drain currents of the fifth and sixth transistors.

REFERENCES:
patent: 3835410 (1974-09-01), Wittlinger
patent: 3873933 (1975-03-01), Wheatley, Jr.
patent: 3930172 (1975-12-01), Dobkin
patent: 4137506 (1979-01-01), Iwamatsu et al.
patent: 4243948 (1981-01-01), Schade, Jr.
patent: 4268759 (1981-05-01), Gilbert
S. Pookaiyaudom et al., "Precise Wide-Dynamic Range Constant Current Ratio Circuits", Proceedings of the IEEE, vol. 65, No. 10, Oct. 1977, pp. 1514-1515.
B. Gilbert et al., "A Wideband Two-Quadrant Analog Multiplier", Digest of Technical Papers, 1980 IEEE International Solid-State Circuits Conference, Feb. 1980, FAM 15.3, pp. 200-201.

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