Digitally programmable differential attenuator with tracking com

Details Digitally programmable differential attenuator with tracking com Digitally programmable differential attenuator with tracking com

1996-02-29

1998-04-21

Callahan, Timothy P.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

327563, 327308, H03F 345

Patent

active

057422044

ABSTRACT:
A differential attenuator and method for providing an attenuated differential output in which an AC common mode component has been reduced. The attenuator includes (a) a voltage divider with two resistive elements for providing the attenuated differential output and a common mode node between the two elements, and (b) a differential amplifier for generating a DC common mode reference which is substantially the same as the DC common mode component in the outputs of the differential amplifier. The differential amplifier has a common mode output connected to the common mode node to provide the DC common mode reference thereto so that the AC common mode component is reduced in the attenuated differential output.

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