Differential amplifier with a common mode voltage loop

Details Differential amplifier with a common mode voltage loop Differential amplifier with a common mode voltage loop

2006-07-04

2006-07-04

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S009000

Reexamination Certificate

active

07071780

ABSTRACT:
An amplifier circuit comprising an amplification chain having a differential output stage; a common mode correction block acting on the input of the output stage as a function of a common mode voltage at the output of said stage and introducing a phase shift between its input and its output for frequencies close to the cut-off frequency of the circuit; and, in parallel with the correction block, a means introducing no phase shift between its input and its output and having at frequencies greater than or equal to the circuit cut-off frequency an output impedance much smaller than the output impedance of the correction block.

REFERENCES:
patent: 4533876 (1985-08-01), Haque et al.
patent: 4752744 (1988-06-01), Aoki
patent: 6965268 (2005-11-01), Dyer et al.
patent: 2002/0167357 (2002-11-01), Renous
Luciano Tomasini, et al., A Fully Differential CMOS Line Driver for ISDN, IEEE Journal of Solid-State Circuits, vol. 25, No. 2 (1990).
French Search Report, FR0304829, Dec. 12, 2003.

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