Amplifiers – With semiconductor amplifying device – Including particular biasing arrangement
Patent
1998-09-08
2000-04-04
Mottola, Steven J.
Amplifiers
With semiconductor amplifying device
Including particular biasing arrangement
330290, 330310, H03G 130
Patent
active
060466421
ABSTRACT:
An active bias compensation circuit (110) senses a quiescent current flowing in an amplifier (130) and adjusts the quiescent current to maintain an optimal DC biasing of the amplifier (130) over a wide range of factors, e.g., temperature variation, process variation, history of the amplifier (130), etc. The compensation circuit (110) includes two transistors (101, 102) forming a difference amplifier. A sensing voltage proportional to the quiescent current and a reference voltage are applied to the base electrodes of the two transistors (101, 102), which generates a bias signal in response to a difference between the sensing voltage and the reference voltage. The bias signal adjusts the quiescent current in the amplifier (130).
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Agar, Jr. Bill Tabano
Brayton Daniel C.
Jones Jeffrey K.
Kaltenecker Robert S.
Dover Rennie William
Motorola Inc.
Mottola Steven J.
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