Single-ended differential circuit using complementary devices

Details Single-ended differential circuit using complementary devices Single-ended differential circuit using complementary devices

2005-04-26

2005-04-26

Mottola, Steven J. (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including balanced to unbalanced circuits and vice versa

C330S261000

Reexamination Certificate

active

06885248

ABSTRACT:
The present invention relates to circuits having differential structure which uses complementary devices for processing single-ended signal. The single-ended differential circuit in accordance with the present invention, comprises first and second complementary devices having first, second, and third terminals, respectively, wherein current flowing from the second terminal to the third terminal has its quantity and direction being varying in dependant on the voltage driven to the first terminal, wherein the currents flowing through the first and second complementary devices vary in opposite relationship. The single-ended differential circuit further comprises an input terminal for driving the first terminals of the first and second complementary devices with a control signal; and biasing means connected to the second and third terminals of the first and second devices, for determining biasing points of the first and second complementary devices such that the first and second devices operates in a differential relationship with respect to a signal driven to the input terminal, wherein the biasing means determining the biasing points such that one of the first and second devices is substantially active.

REFERENCES:
patent: 6097250 (2000-08-01), Kamali et al.
patent: 6693493 (2004-02-01), Kim et al.
Anadigics Application Note for ACA0861—A,B,C,D 750/860 Mhz CATV Line Amplifiers, Rev. 2, Aug. 2001, pp. 1-16.*
Kyeongho Lee et al., A Single-Chip 2.4 Ghz Direct-Conversion CMOS Receiver for Wireless Local Loop using One -third Frequency Local Oscillator, 2000 Symposium on VLSI Circuits Digest fo Technical Papers, pp 42-45.

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