Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Patent
1996-01-18
1997-08-26
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
327553, 327562, 327103, H03F 345, H03F 3191
Patent
active
056614322
ABSTRACT:
A time-continuous tunable Gm-C integrator including a "super Gm" differential input stage (O1; MI1/O2, MI2) and using linear and constant degeneration resistors (R1/R2) for obtaining the most optimal linear input-voltage to output-current conversion is tunable in a time-continuous manner. The integrator is provided with three tuning CMOS transistors (MU1, MU2, MU3) controlling the integrating currents flowing between the input stages and from the input stages towards the outputs (OP/ON). By a suitable control of the tuning transistors and owing to the fact that the voltage swing across the latter is small, it is possible to obtain a perfectly linear transconductance (Gm) characteristic over the whole operating range of the integrator.
REFERENCES:
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patent: 5384501 (1995-01-01), Koyama et al.
patent: 5440264 (1995-08-01), Sevenhans et al.
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patent: 5471168 (1995-11-01), Sevenhans et al.
patent: 5559470 (1996-09-01), Laber et al.
"Very high linearity tunable OTA in 5 V CMOS" by A.M. Durham et al, IEE Proceedings-G, vol. 140, No. 3, Jun. 1993, pp. 207-210.
Chang Zhong Yuan
Haspeslagh Didier Rene
ALCATEL N.V.
Callahan Timothy P.
Lam T. T.
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