Low sensitivity switched-capacitor ladder filter using monolithi

Details Low sensitivity switched-capacitor ladder filter using monolithi Low sensitivity switched-capacitor ladder filter using monolithi

1979-12-18

1982-07-06

Mullins, James B.

Amplifiers

Signal feedback

Plural amplifier channels

330107, H03F 134

Patent

active

043385710

ABSTRACT:
A switched-capacitor circuit (50) for passing an audio frequency over a predetermined range of frequencies fabricated on a monolithic semiconductor substrate is provided. The switched-capacitor filter (50) includes a first amplifier (60) and a second amplifier (90). A first integrator capacitor (66) is interconnected to the first amplifier (60). A second integrator capacitor (96) is interconnected to the first amplifier (90). A first input switched-capacitor (82) is interconnected between the first amplifier (60) and the second amplifier (90), such that the first input switched-capacitor (82) samples and holds the output of the second amplifier (90) during a first clock phase thereby isolating the output of the second amplifier (90) from the input of the first amplifier (60). During a second clock phase the first input switched-capacitor (82) applies the output of the second amplifier (90) to the first integrator capacitor (66). A second input switched-capacitor (112) is provided and is interconnected between the output of the first amplifier (60) and the input of the second amplifier (90), such that during the second clock phase the second input switched-capacitor (112) applies the output of the first amplifier (60) to the second integrator capacitor (96). The switched-capacitor circuit (50) functions such that effectively zero phase shift is introduced into the signal being processed by the switched-capacitor circuit (50).

REFERENCES:
Bruton, "Low-Sensitivity Digital Ladder Filters", IEEE Transactions on Circuits and Systems, V. Cas-22, No. 3, Mar. 1975, pp. 168-176.
Allstot et al, "MOS Switched Capacitor Ladder Filters", IEEE Journal of Solid-State Circuits, vol. SC-13, No. 6, Dec. 1978, pp. 806-814.

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