Low distortion amplifier

Details Low distortion amplifier Low distortion amplifier

2007-08-07

2007-08-07

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including plural stages cascaded

C330S310000

Reexamination Certificate

active

11148683

ABSTRACT:
A low distortion amplifier. The novel amplifier includes a first transistor Q1having first and second output terminals and an input terminal adapted to receive an input signal, and a second transistor Q2having first and second output terminals and an input terminal adapted to receive a signal from the first output terminal of Q1, wherein the second output terminal of Q1is connected to the second output terminal of Q2in order to eliminate a nonlinear current component in Q2. In an illustrative embodiment, the amplifier also includes a cascode Darlington pair Q3, Q4for holding the second output terminals of Q1and Q2at a desired voltage to further reduce distortion and to maintain a wide bandwidth.

REFERENCES:
patent: 3753121 (1973-08-01), Hilbert
patent: 3934209 (1976-01-01), Valentine et al.
patent: 4355344 (1982-10-01), Felici et al.
patent: 4409560 (1983-10-01), Davis
patent: 5859568 (1999-01-01), Le et al.
patent: 6584196 (2003-06-01), Sacca et al.

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