Circuit and method of zero generation in a real-time filter

Details Circuit and method of zero generation in a real-time filter Circuit and method of zero generation in a real-time filter

1994-01-03

1995-02-28

Cunningham, Terry D.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

327311, 327551, H04B 110

Patent

active

053940369

ABSTRACT:
A real-time tracking filter circuit (10) that exhibits accurate zero placement is implemented in a monolithic structure by incorporating a three-input summing circuit (24) and a two-input summing circuit (28). The input signal (12) and a feedback signal (30) are summed and converted to a first current. The first current is integrated for providing a first integrated voltage (18). The first integrated voltage and an amplified input signal (40) and the feedback signal are summed and converted to a second current. The second current is integrated for providing a second integrated voltage as the feedback signal. The second integrated voltage and the amplified input signal are summed for providing the filtered output signal (36). Integration capacitors (20, 32) are grounded to remove parasitic effects that impact the pole-zero frequency response of the tracking filter output.

REFERENCES:
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patent: 5140198 (1992-08-01), Atherly et al.
patent: 5311087 (1994-05-01), Suganuma
patent: 5317217 (1994-05-01), Rieger et al.

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