Integrated active integrator filter with compensated unity gain

Details Integrated active integrator filter with compensated unity gain Integrated active integrator filter with compensated unity gain

1997-12-15

1999-07-27

Le, Dinh

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

327336, 327344, 327553, 333172, 330107, H03K 500

Patent

active

059296992

ABSTRACT:
An active RC integrator filter with finite operational amplifier bandwidth can be compensated by biasing the operational amplifier input stage such that its transconductance becomes a function of the resistance. Thereafter, by inserting another resistance of the same material in series with the integrating capacitor, a zero results in the overall transfer function of the filter according to the present invention. In this manner, the passband peaking of the active RC integrator filter resulting from the integrator phase shift can be avoided.

REFERENCES:
patent: 3643173 (1972-02-01), Whitten
patent: 5166630 (1992-11-01), Lee
"Understanding Wide-band MOS Transistors", John M. Steininger (May 1990).
"A High Performance Low Power CMOS Channel Filter", William C. Black, Jr., David J. Allstot, and Ray A. Reed, IEEE (1980).

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