Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2011-01-18
2011-01-18
Choe, Henry K (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S261000
Reexamination Certificate
active
07872530
ABSTRACT:
An amplifying device (10) includes first, second, third and fourth transistors (M1, M2, M3, M4). In the first and third transistors (M1, M3) the source is connected to an input signal source (IN+, IN−), the gate is connected to a biasing potential (VB) and the drain is connected to a signal output (O+, O−). There is a first and second branch (B1, B2) between the source and drain of the first and third transistor (M1, M3), respectively, each including a corresponding second or fourth transistor (M2, M4). The device also includes a third branch (B3) comprising a first capacitor (C1) and a first switch (SW1) connected between the first transistor (M1) source and the third transistor (M3) gate, and a fourth branch (B4) comprising a second capacitor (C2) and a second switch (SW2) connected between the third transistor (M3) source and the first transistor (M1) gate.
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patent: 7489193 (2009-02-01), Adachi
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patent: 1748553 (2007-01-01), None
patent: 2004/098048 (2004-11-01), None
Garcia, P. et al. “Improved High Dynamic Range Switched Gain Low-Noise Amplifier for Wide-Band CDMA Applications.” Proceedings of the 27th European Solid-State Circuits Conference (ESSCIRC 2001), Sep. 18-20, 2001.
Phansathitwong Kittichai
Sjöland Henrik
Choe Henry K
Coats & Bennett P.L.L.C.
Telefonaktiebolaget LM Ericsson (publ)
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