Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2008-01-08
2008-01-08
Choe, Henry (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S278000
Reexamination Certificate
active
11473331
ABSTRACT:
A variable gain amplifier comprises a plurality of serially connected transistor cells, in which each of the transistor cells has a plurality of connecting terminals. The first terminals of the transistor cells are serially coupled together to receive a first input voltage. The second terminals of the transistor cells are serially connected via a first set of resistors between adjacent cells and coupled to a first gain control. Each of the second terminals is AC or virtual grounded. The third terminals of the transistor cells are coupled together to supply a positive current output. The fourth terminals of the transistor cells are coupled together to supply a negative current output.
REFERENCES:
patent: 5077541 (1991-12-01), Gilbert
patent: 5313172 (1994-05-01), Vagher
patent: 5619169 (1997-04-01), Matsuura
patent: 7262661 (2007-08-01), Zou
patent: 0 234 655 (1987-09-01), None
International Search Report issued in corresponding International Patent Application No. PCT/US2006/043965 dated Mar. 15, 2007.
Van Lieshout, P.J.G, et al., “A Power-Efficient, Low-Distortion Variable Gain Amplifier Consisting of Coupled Differential Pairs”, IEEE Journal of Solid-State Circuits, Dec. 1997, pp. 2105-2110, vol. 32 No. 12, IEEE.
Choe Henry
Linear Technology Corporation
McDermott Will & Emery LLP
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