Completely differential filter with switched condensers using CM

Details Completely differential filter with switched condensers using CM Completely differential filter with switched condensers using CM

1994-01-28

1996-11-19

Mottola, Steven J.

Amplifiers

Signal feedback

Phase shift means in loop path

330109, H03F 134

Patent

active

RE0353795

ABSTRACT:
The filter comprises at least one completely differential operational amplifier having two inputs and two outputs and at least one pair of feedback circuits connecting said outputs with respective inputs of said amplifier outside of same. The operational amplifier has no common-mode feedback circuit, whose functions are performed by said feedback circuits external to the amplifier.

REFERENCES:
patent: 4533877 (1985-08-01), Rahim
patent: 4574250 (1986-03-01), Senderowicz
patent: 4609877 (1986-09-01), Nicollini et al.
patent: 4918399 (1990-04-01), Devecchi et al.
patent: 4920325 (1990-04-01), Nicollini et al.
Maloberti, F., et al., "Low-Noise Time-Shared Differential Switched-Capacitor Ladder Filters", IEEE 1983 Symp. CRTs and Systems, vol. 2, pp. 559-566.

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