Adaptive power control circuit
First Claim
1. A power control circuit for controlling the power of a transmitter amplifier which produces an RF output varying in response to a control signal applied thereto, comprising:
- (a) sensing means, coupled to the transmitter amplifier, for sensing RF power, and for generating a power signal representative of RF power;
(b) signal processing means, coupled to the sensing means, for filtering the power signal, such that wide bandwidth filtering is utilized in response to a desired change in transmitter amplifier power for a period of time sufficient to permit the desired change in transmitter amplifier power, and such that narrow bandwidth filtering is otherwise utilized;
(c) comparator means, coupled to the signal processing means, for generating a control signal which varies in accordance with the difference between a reference voltage and the filtered power signal, said comparator means being coupled to the transmitter amplifier for applying said control signal thereto to vary the RF power developed by the transmitter amplifier.
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Accused Products
Abstract
A transmitter power control circuit which provides normal power control functions, and provides a high speed loop response when abrupt changes in output power are required. The circuit utilizes an electronic switch to provide adaptive filtering to permit narrow bandwidth filtering during normal steady state operation of the transmitter and wide bandwidth filtering during desired abrupt changes in transmitter power output. This allows rapid changes in transmitter output power when desired, while substantially eliminating undesired noise during normal operation.
11 Citations
11 Claims
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1. A power control circuit for controlling the power of a transmitter amplifier which produces an RF output varying in response to a control signal applied thereto, comprising:
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(a) sensing means, coupled to the transmitter amplifier, for sensing RF power, and for generating a power signal representative of RF power; (b) signal processing means, coupled to the sensing means, for filtering the power signal, such that wide bandwidth filtering is utilized in response to a desired change in transmitter amplifier power for a period of time sufficient to permit the desired change in transmitter amplifier power, and such that narrow bandwidth filtering is otherwise utilized; (c) comparator means, coupled to the signal processing means, for generating a control signal which varies in accordance with the difference between a reference voltage and the filtered power signal, said comparator means being coupled to the transmitter amplifier for applying said control signal thereto to vary the RF power developed by the transmitter amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. Method of controlling the power of a transmitter amplifier comprising the steps of:
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(a) sensing power output from the transmitter and generating a power signal representative of the power output; (b) filtering the power signal utilizing wide bandwidth filtering in response to a desired change in the transmitter amplifier power for a period of time sufficient to permit the desired change in transmitter power, and otherwise utilizing narrow bandwidth filtering; (c) generating a control signal which varies in accordance with the difference between a reference voltage and the filtered power signal; (d) applying said control signal to the transmitter amplifier to control the power developed by the transmitter amplifier. - View Dependent Claims (10, 11)
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Specification