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US 2004/0000953 A1Published application
Bias control for HBT power amplifiers
AssigneeFreescale Semiconductor, Inc.
InventorsDavid A. Newman, Benjamin R. Gilsdorf
Life of this patent
Estimating the term…
Abstract
A power amplifier's base current is biased by a control circuit that produces a linear relationship across varying temperatures and processes. A voltage to current converter controls a voltage follower configured operational amplifier in response to a reference device to drive the voltage and current of the power amplifier.
Claims14
An integrated circuit comprising:
- a power amplifier having a base, an emitter and a collector;
- a bias control circuit controlling a current supplied to the base of the power amplifier;
- and
- a reference device having a base, a collector and an emitter wherein the base of the reference device is isolated from the base of the power amplifier.
1 more element
An integrated circuit comprising:
- a power amplifier having a collector producing an output signal and connected with a batter source, an emitter connected with ground and a base injected by an RF signal and connected with a first input and an output of an operational amplifier;
- a reference device having a collector connected to a second input of the operational amplifier, a base connected with the collector and an emitter connected with ground;
- and
- a voltage to current converter having a power source input connected with the battery source, a control input connected with an analog control signal and an output connected to the second input of the operational amplifier and to the collector of the reference device.
1 more element
Dependencies are inferred from the claim text.