Reference module apparatus and method therefor

Details Reference module apparatus and method therefor Reference module apparatus and method therefor

2006-07-06

2008-03-25

Jeanglaude, Jean Bruner (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

C341S117000, C341S118000, C341S119000, C341S120000

Reexamination Certificate

active

07348910

ABSTRACT:
A Root Mean Square (RMS) detector circuit includes a first differential pair circuit arranged to operate in a common mode. The detector circuit also includes a compensation circuit unit having a second differential pair circuit to duplicate an unwanted base current drawn by the first differential pair circuit. The compensation circuit unit is arranged to generate an offset voltage using the duplicated base current. The compensation circuit unit also has an operational amplifier coupled to an NMOS transistor so as to generate a corrective current corresponding to the offset voltage, the corrective current being mirrored by a current mirror and provided as a compensatory current to an input of the first differential pair circuit.

REFERENCES:
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patent: 5585757 (1996-12-01), Frey
patent: 5714911 (1998-02-01), Gilbert
patent: 6172549 (2001-01-01), Gilbert
patent: 6204719 (2001-03-01), Gilbert
patent: 6348829 (2002-02-01), Gilbert
patent: 6549057 (2003-04-01), Gilbert

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