Amplifiers – With semiconductor amplifying device – Including gain control means
Reexamination Certificate
2005-09-08
2010-10-19
Nguyen, Khanh V (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including gain control means
C330S282000, C330S311000
Reexamination Certificate
active
07816991
ABSTRACT:
A controllable-gain circuit (TI, Rt, TS1, . . . , TS4) provides a first and a second pair of complementary gain-controlled signals (Ip1, Ip3; Ip2, Ip4) in response to an input signal (RFI). In each pair, one gain-controlled signal (Ip1, Ip2) is the input signal amplified with a gain G comprised in a range between a minimum gain Gmin and a maximum gain Gmax. The other gain-controlled signal (Ip3, Ip4) is the input signal amplified with complementary gain Gmax-G. A fixed-gain output circuit (Rfg, Nfg) makes a weighed sum (Ip1*Rfg+Ip3*Rfg) of one and the other gain-controlled signal in the first pair of complementary gain-controlled signals. The respective weighing factors for one and the other gain-controlled signal are substantially similar (Rfg). A controllable-gain output circuit (Rlg, Rhg, Nlg, Nhg) makes a weighed sum (Ip2*Rlg+Ip4*(Rlg+Rhg)) of one and the other gaincontrolled signal in the second pair of complementary gain-controlled signals. The respective weighing factors for one and the other gain-controlled signal are substantially different (Rlg, Rlg+Rhg).
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patent: 2003/0001675 (2003-01-01), Costa et al.
Amiot Sebastien
Kervaon Thibault Philippe Paul
Nguyen Khanh V
NXP B.V.
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