MOS voltage to current converter

Details MOS voltage to current converter MOS voltage to current converter

1988-04-14

1989-05-30

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including field effect transistor

323315, 330288, H03F 316, G05F 156

Patent

active

048354872

ABSTRACT:
A voltage to current converter circuit manufactured with a MOS process generates a linear reference current over a wide bandwidth and operates with an input signal that varies to either supply rail. A voltage divider network scales an input voltage for conversion to a linear current by a cascode current mirror and a gain resistor. The value of the gain resistor determines the transconductance of the conversion from voltage to current. A second current mirror provides feedback to keep the reference current accurate. An output stage makes available high impedance source and sink current output terminals wherein a source current and a sink current relative to the reference current are provided. Several voltage to current converter circuits may be coupled together to provide a addition, subtraction, multiplication, and other circuit and system functions.

REFERENCES:
patent: 4019121 (1977-04-01), Feindt
patent: 4325019 (1982-04-01), Tezuka
patent: 4612496 (1986-09-01), Hines
patent: 4618816 (1986-10-01), Monticelli
patent: 4700144 (1987-10-01), Thomson
patent: 4717869 (1988-01-01), Koch et al.

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