High-accuracy four-quadrant multiplier which also is capable of

Details High-accuracy four-quadrant multiplier which also is capable of High-accuracy four-quadrant multiplier which also is capable of

1983-02-11

1986-04-29

Ruggiero, Joseph

Boots, shoes, and leggings

307498, 328160, 364849, G06G 716

Patent

active

045861552

ABSTRACT:
A four-quadrant analog multiplier comprising a first pair of transistors to handle one multiplier input and second and third pairs of transistors interconnected with said first pair to effect multiplication. Resistors are connected to the bases of the second and third pairs of transistors, and current which is proportional-to-absolute-temperature is caused to flow through the resistors. The resistors are laser-trimmed until V.sub.BE mismatch distortion is nulled. An op amp is used to drive the bases of all three pairs of transistors. A current source is connected to the first pair of transistors, and is separately controlled so as to provide for four-quadrant division. A number of additional features are incorporated to further minimize distortion and to improve performance in other respects.

REFERENCES:
patent: T886006 (1970-04-01), Nichols
patent: 3432650 (1969-03-01), Thompson
patent: 3689752 (1972-09-01), Gilbert
patent: 3838262 (1974-09-01), Van de Plassche
patent: 4156283 (1979-05-01), Gilbert
patent: 4353000 (1982-10-01), Noda
Gilbert et al., "A Wideband Two-Quadrant Analog Multiplier", IEEE International Solid-State Circuits Conference, Feb. 1980, pp. 200-201.
Gilbert, "Analog Multiplier", New Electronics, vol. 10, No. 2, Jan. 1977, pp. 38, 40.
Bradshaw, "A Monolithic 0.1% Pulse Height Duration Multiplier-Divider", 8th Asilomar Conference on Circuits, Systems and Computers, Dec. 1974, pp. 308-313.

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