Generalized switched-capacitor active filter

Details Generalized switched-capacitor active filter Generalized switched-capacitor active filter

1979-12-05

1982-02-09

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

328151, 333174, H03H 1900, H03K 5153

Patent

active

043152279

ABSTRACT:
Because of the very large variety of useful filter configurations, it is highly desirable to have a generalized circuit topology from which all specific filters can be derived. A generalized switched-capacitor biquadratic active filter comprises a pair of operational amplifiers (10, 11), each of which has an unswitched feedback capacitor (D, B) connected between its output port (3, 3') and its inverting input port (1, 1'). A third through-switched capacitor (C) provides feedback between the output port (3') of the second amplifier (11) and the inverting input port (1) of the first amplifier (10). A diagonally-switched capacitor (A) couples the output port (3) of the first amplifier (10) to the inverting input port (1') of the second amplifier (11). The noninverting input ports (2, 2') of the two amplifiers are connected to signal ground. The filter input terminal (5) is connected to the inverting input ports (1, 1') of each amplifier by an input circuit including a parallel array of an unswitched capacitor, a diagonally-switched capacitor, and a through-switched capacitor (L, H, G and K, J, I). Damping is provided by either a through-switched capacitor (F) connected in parallel with feedback capacitor (B), or by a unswitched capacitor (E) connected in parallel with through switched feedback capacitor (C).

REFERENCES:
Martin-"Improved Circuits for the Realization of Switched Capacitor Filters", Proc. of 1979 ISCAS, 1979; pp. 756-759.
White et al.-"A Monolithic Dual-Tone Multifrequency Receiver", Session II: Telecommunication Circuit Techniques, 1979, IEEE International Solid-State Circuits Conference, Feb. 14, 1979, (Pennsylvania Ballroom); pp. 36-37.
Martin et al.-"Strays-Insensitive Switched-Capacitor Filters Based on Bilinear Z-Transform", Electronic Letters, vol. 15, No. 13, Jun. 21, 1979; pp. 365-366.

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