Amplifiers – With semiconductor amplifying device – Including particular biasing arrangement
Patent
1996-08-28
1998-05-26
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including particular biasing arrangement
330285, H03G 330
Patent
active
057572372
ABSTRACT:
A power amplifier (50) includes two transistors (11, 21) and a dynamic biasing circuit (52). The dynamic biasing circuit (52) uses a sampling circuit (54) to generate a bias adjusting signal proportional to the amplitude of an AC signal at a drain electrode of the first transistor (11). The bias adjusting signal is combined with a constant voltage bias signal to generate a dynamic biasing signal applied to a gate electrode of the second transistor (21). As the gain of the first transistor (11) decreases, the amplitude of the AC signal at its drain electrode decreases. Thus, the dynamic biasing circuit (52) generates a lower dynamic biasing signal at the gate electrode of the second transistor (21), thereby decreasing a quiescent drain current in the second transistor (21) and improving the efficiency of the amplifier (50) at low output power levels.
REFERENCES:
patent: 3708756 (1973-01-01), Fajen
patent: 4442407 (1984-04-01), Apel
patent: 4462004 (1984-07-01), Cox et al.
patent: 5216379 (1993-06-01), Hamley
patent: 5392464 (1995-02-01), Pakonen
patent: 5455968 (1995-10-01), Pham
patent: 5559471 (1996-09-01), Black
Beckwith William B.
Staudinger Joseph
Hoshizaki Gary
Motorola Inc.
Mottola Steven
Zhou Ziye
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