CMOS programmable resistor-based transconductor

Details CMOS programmable resistor-based transconductor CMOS programmable resistor-based transconductor

1995-03-14

1996-04-23

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Converting input voltage to output current or vice versa

327561, 330254, 330260, H03F 345

Patent

active

055107389

ABSTRACT:
A CMOS programmable resistor-based transconductor receives a differential input voltage and generates a differential output current. The transconductor includes a degenerate pair of transistors linearized by servo feedback, and further includes a string of series-connected resistors defining a group of tap points. Two selected tap points in the resistor string are selected by digital control of MOS switches and are connected, respectively, to the feedback input of the two amplifiers in the feedback loops. Because no DC current flows through the MOS switches into the high impedance inputs of the amplifiers, the differential input voltage is impressed across a portion of the resistor string residing between the two selected tap points, and the conversion gain is determined by the value of this portion of the resistor string.

REFERENCES:
patent: 4100433 (1978-07-01), Duffy et al.
patent: 4134078 (1979-01-01), Arai et al.
patent: 4462003 (1984-07-01), Takamatsu
patent: 4667166 (1987-05-01), Itoh
patent: 5404097 (1995-04-01), Barou
Scott D. Willingham et al. "A BiCMOS Low-Distortion 8-MHz Low-Pass Filter", IEEE Journal of Solid-State Circuits, vol. 28, No. 12, Dec. 1993, pp. 1234-1245.

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