Transconductance cell with improved linearity

Details Transconductance cell with improved linearity Transconductance cell with improved linearity

1992-07-23

1994-05-10

Sikes, William L.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307494, 307490, 328167, H03B 512

Patent

active

053110889

ABSTRACT:
Analog filters may be conveniently implemented in MOS technology by the use of "transconductance cells". Each cell includes stages each having a pair of current paths, with each path comprising a current source and input transistor. The gain of each stage is set by a transistor connected across the current path, with the transconductance of this transistor being controlled by its gate voltage. In the inventive technique, a transconductance cell comprising two input stages utilizes inputs to each input stage that are in-phase rather than complementary, as in prior-art designs. The inputs to the second input stage are then each balanced (out of phase) with respect to the inputs to the first input stage. Higher linearity is obtained, with the common-mode signal being cancelled by the summation of currents supplied by the input stages to the common output stage. A biquadratic filter conveniently implements this technique, with other applications being possible.

REFERENCES:
patent: 4374335 (1983-02-01), Fukahoki et al.
patent: 5001441 (1991-03-01), Gen-Kuong
patent: 5051628 (1991-09-01), Hanna
patent: 5093634 (1992-03-01), Khoury
patent: 5155395 (1992-10-01), Motte
patent: 5182522 (1993-01-01), Tanigawa et al.
patent: 5189321 (1993-02-01), Seevinck
patent: 5223743 (1993-07-01), Nakagawara
IEEE Journal of Solid-State Circuits, vol. 26, No. 12, Dec. 1991, 0018-9200/91/1200-1988$01.00, "Design of a 15-MHz CMOS Continuous-Time Filter with On-Chip Turing", John M., Khoury, Member, IEEE, pp. 1988-1997.

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