Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2007-11-29
2010-02-09
Choe, Henry K (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S098000
Reexamination Certificate
active
07659780
ABSTRACT:
A gain control circuit including a resistor with a first terminal and a second terminal; an operational amplifier with an inverting terminal thereof electrically coupled to said first terminal of said resistor; a non-inverting terminal thereof; and an output terminal thereof; an amplifier circuit for transforming the voltage change of said operational amplifier output into a substantially exponential current change; wherein the output of said amplifier circuit is electrically coupled to said inverting terminal of said operational amplifier. The above described gain control circuit is able to perform wide bandwidth input signal buffering with linearity under low voltage and low power conditions. The circuit also offers low output impedances without the need of additional buffers and hence minimizing circuit size and manufacturing costs.
REFERENCES:
patent: 4366446 (1982-12-01), Henderson et al.
patent: 4546327 (1985-10-01), Suzuki et al.
patent: 4931797 (1990-06-01), Kagawa et al.
patent: 4933647 (1990-06-01), Dea
patent: 5424682 (1995-06-01), Gomez et al.
Ho Jennifer Shuet Yan
Kuang Xiaofei
Kwong David Kwok Kuen
Leung Lap Chi
Mak Chit Ah
Choe Henry K
Hong Kong Applied Science and Technology Research Institute Co.
Schneider Ryan A.
Troutman Sanders LLP
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