Common mode compensation for differential integrating filter

Details Common mode compensation for differential integrating filter Common mode compensation for differential integrating filter

1990-01-03

1991-02-26

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330310, 307491, H03F 345

Patent

active

049964984

ABSTRACT:
A filter cell having common mode compensation for use in a differential integrating filter includes a transconductance amplifier that comprises a pair of differentially connected transistors the bases of which are coupled to respective inputs of the filter cell and whose emitters are interconnected to a current sinking transistor while the collectors are coupled via respective output circuitry to first and second outputs of the filter cell. Circuitry is provided to set the common voltage levels at the first and second outputs of the comprising a pair of resistors commonly connected at a circuit node that is a virtual ground for differential signals and the first and second filter cell outputs respectively. The circuit node is also coupled to the base of the current sinking transistor to thereby for a common mode closed loop in conjunction with a current supply that is also coupled to the circuit node. Common mode compensation to inhibit loop instability is provided by a pair of capacitors coupled in series between the collectors of differentially connected transistors and having the junction therebetween connected to the base of the current sinking transistor.

REFERENCES:
patent: 4697152 (1987-09-01), Westwick
patent: 4918399 (1990-04-01), Devecchi et al.

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