Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2008-05-29
2009-10-20
Nguyen, Patricia (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S12400D, C330S252000
Reexamination Certificate
active
07605655
ABSTRACT:
There is provided a highly linear differential amplifying circuit. The highly linear differential amplifying circuit includes: a differential amplifying unit including a main differential amplifying unit having a differential pair of transistors for amplifying a difference of two input signals and an auxiliary amplifying unit connected in parallel with the main differential amplifying unit, wherein second-order derivatives of transconductances of the main differential amplifying unit and the auxiliary differential amplifying unit are properly set to have an offset; and a source degeneration resistor unit including a first source degeneration resistor to a fourth source degeneration resistor. Accordingly, the linearity of the differential amplifying circuit is improved at a wide output power region.
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Han Sangwon
Kim Jong-sik
Shin Hyunchol
Foley & Lardner LLP
Integrant Technologies Inc.
Nguyen Patricia
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