Amplifiers – With semiconductor amplifying device – Including balanced to unbalanced circuits and vice versa
Reexamination Certificate
2011-08-02
2011-08-02
Nguyen, Hieu P (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including balanced to unbalanced circuits and vice versa
C323S273000
Reexamination Certificate
active
07990222
ABSTRACT:
A circuit for converting first and second differential input signals into an output signal is provided with a first differential input stage comprising first and second inputs for receiving the first differential input signal and comprising first and second outputs and with a second differential input stage comprising third and fourth inputs for receiving the second differential input signal and comprising third and fourth outputs and with an output stage comprising a first terminal connected to the first output that is further connected to the third output and comprising a second terminal connected to the second output that is further connected to the fourth output and comprising a third terminal for providing the output signal, to avoid complex operational amplifiers. The differential input stages comprise two pairs of transistors and the output stage comprises a current mirror with a third pair of transistors. A regulator comprises the circuit and a modulator stage for in response to the output signal modulating a voltage supply signal.
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patent: 7064609 (2006-06-01), Beck et al.
patent: 7208925 (2007-04-01), Rose
patent: 2005/0258901 (2005-11-01), Khorramabadi
patent: 2002-176770 (2002-06-01), None
Huang et al., “Novel Fully-Integrated Active Filters Using the CMOS Differential Difference Amplifier,” IEEE, pp. 173-176, Aug. 14, 1989.
Säckinger et al., “A Versatile Building Block: The CMOS Differential Difference Amplifier,” IEEE Journal of Solid-State Circuits, 22(2):287-294, Apr. 1987.
Iannucci Robert
Nguyen Hieu P
Seed IP Law Group PLLC
ST-Ericsson SA
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