Common-mode and differential-mode compensation for...

Details Common-mode and differential-mode compensation for... Common-mode and differential-mode compensation for...

2005-03-15

2005-03-15

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S258000

Reexamination Certificate

active

06867649

ABSTRACT:
An amplifier is configured to provide both common-mode and differential-mode compensation to ensure stability in telecommunications circuits or other circuits where both common mode and differential mode signal paths are provided. The amplifier includes two interconnected operational amplifiers AMPAand AMPB. Common mode compensation is provided by connecting one or more capacitors with a total value CCOMMONconnected from a gain node at the input of an inverter in one of the amplifiers AMPAor AMPBto the output of the inverter in the other amplifier. Differential mode compensation can be provided by connecting a capacitor with value CCOMPat the gain node of each of the amplifiers AMPAor AMPB. Alternatively, both differential mode and Miller effect compensation can be provided by connecting one or more capacitors with total value CCOMPfrom the input to the output of components forming the inverter in each of the amplifiers AMPAand AMPB. As a further alternative, differential mode compensation can is provided independent of common mode compensation by connecting a capacitor with value CDIFFbetween the outputs of the inverters of the amplifiers AMPAand AMPB.

REFERENCES:
patent: 5266852 (1993-11-01), Shigenari et al.
patent: 5374897 (1994-12-01), Moraveji
patent: 5420542 (1995-05-01), Harvey

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