Circuit for RF buffer and method of operation

Details Circuit for RF buffer and method of operation Circuit for RF buffer and method of operation

1999-03-29

2000-08-08

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330268, H03F 326

Patent

active

061007633

ABSTRACT:
An RF buffer (10) supplies a single ended output signal and differential output signals. An average voltage of the differential output signals is compared to a reference voltage (VR) by an amplifier (40). The amplifier (40) provides a feedback signal for controlling the bias current conducted by a first transistor (24) and a mirrored bias current conducted by a second transistor (46). The bias currents conducted by the first and second transistors (24, 46) are used to generate the differential output signals (OUT-, OUT+) and are substantially independent of the signal level at an input terminal (20). The signal current conducted by the first transistor (24) controls an output transistor (66), while the signal current conducted by the second transistor (46) controls another output transistor (56) in the push-pull output stage of the RF buffer (10).

REFERENCES:
patent: 3772606 (1973-11-01), Waehner
patent: 4458213 (1984-07-01), Quan
patent: 5467058 (1995-11-01), Fujita
patent: 5497123 (1996-03-01), Main et al.
patent: 5973563 (1999-10-01), Seven

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