Amplifiers – With semiconductor amplifying device – Including plural stages cascaded
Reexamination Certificate
2010-03-01
2011-12-06
Choe, Henry (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including plural stages cascaded
C330S302000
Reexamination Certificate
active
08072272
ABSTRACT:
A tunable inter-stage matching circuit that can improve performance is described. In an exemplary design, an apparatus includes a first active circuit (e.g., a driver amplifier), a second active circuit (e.g., a power amplifier), and a tunable inter-stage matching circuit coupled between the first and second active circuits. The tunable inter-stage matching circuit includes a tunable capacitor that can be varied in discrete steps to adjust impedance matching between the first and second active circuits. In an exemplary design, the tunable capacitor includes (i) a plurality of capacitors coupled in parallel and (ii) a plurality of switches coupled to the plurality of capacitors, one switch for each capacitor. Each switch may be turned on to select an associated capacitor or turned off to unselect the associated capacitor. The tunable capacitor may further include a fixed capacitor coupled in parallel with the plurality of capacitors.
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Hadjichristos Aristotele
Nejati Babak
Pletcher Nathan M
Zhao Yu
Choe Henry
Mobarhan Ramin
QUALCOMM Incorporated
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