Differential circuit with improved linearity

Amplifiers – With semiconductor amplifying device – Including differential amplifier

Reexamination Certificate

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C330S253000

Reexamination Certificate

active

07423485

ABSTRACT:
A differential circuit includes main transistors differentially coupled for converting differential input signals into main differential currents at output terminals. The differential circuit also includes compensation transistors coupled to the main transistors for converting the differential input signals into compensation differential currents at the output terminals. Each compensation differential current has an exponential current-voltage characteristic for improving linearity of the differential circuit.

REFERENCES:
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patent: 5523717 (1996-06-01), Kimura
patent: 5619169 (1997-04-01), Matsuura
patent: 6445251 (2002-09-01), Robinson
patent: 6871057 (2005-03-01), Ugajin et al.
Japanese Patent Application No. 04-120025, having Publication date of Nov. 5, 1993 (w/English Abstract page).
Korean Patent Application No. 1019990029627, having Publication date of Feb. 15, 2001 (w/ English Abstract page).
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Korean Patent Application No. 08-320825, having Publication date of Jun. 2, 1998 (w/ English Abstract page).

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