Apparatus for amplifying differential signal

Details Apparatus for amplifying differential signal Apparatus for amplifying differential signal

2008-07-29

2008-07-29

Mottola, Steven J (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S303000, C330S305000

Reexamination Certificate

active

07405621

ABSTRACT:
An apparatus for amplifying differential signals is provided. The apparatus comprises a differential amplifier, a first impedance component, a second impedance component, a voltage source and a high-pass filter. The differential amplifier receives an input differential signal with a first terminal and a second terminal. The differential amplifier also drains currents from the voltage source into a third terminal and a fourth terminal via the first and the second impedance components respectively. The high-pass filter receives the input differential signal and outputs a control differential signal to control the first and the second impedance components so that the impedance of the first and the second impedance components vary inversely in response to the voltages at the first and the second terminals respectively when the state of the input differential signal changes.

REFERENCES:
patent: 6480067 (2002-11-01), Kobayashi et al.
patent: 6670847 (2003-12-01), Rokhsaz
patent: 6937054 (2005-08-01), Hsu et al.
patent: 2007/0115048 (2007-05-01), Mansuri et al.

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