Amplifier arrangement
First Claim
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1. A method of controlling the gain of an RF amplifier device, the RF amplifier device having an input signal and an output signal, and a plurality of parallel-connected gain stages, the method comprisingcomparing a measure of magnitude of the input signal to a like measure of magnitude of the output signal;
- andusing a result of the comparison to selectively enable said gain stages by switching respective gain stages into and out of circuit to achieve a gain equal to that of the sum of the gains of the enabled gain stages.
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Abstract
A gain-controlled RF amplifier system has an input node and an output node. The system has a plurality of amplifier devices, selectively connectable between the input node and the output node. The amplifier devices are placed in circuit according to a measured gain derived by comparing a magnitude of a signal input to the input node against a magnitude of a signal output from the output node, and a desired value of gain.
14 Citations
13 Claims
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1. A method of controlling the gain of an RF amplifier device, the RF amplifier device having an input signal and an output signal, and a plurality of parallel-connected gain stages, the method comprising
comparing a measure of magnitude of the input signal to a like measure of magnitude of the output signal; - and
using a result of the comparison to selectively enable said gain stages by switching respective gain stages into and out of circuit to achieve a gain equal to that of the sum of the gains of the enabled gain stages. - View Dependent Claims (2, 3, 4)
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5. A gain-controlled RF amplifier system, the system having an input node and an output node and further comprising
a plurality of parallel-connected gain stages, connected between the input node and the output node; -
circuitry for comparing a magnitude of a signal input to the input node against a magnitude of a signal output from the output node, the comparing circuitry having an output providing a comparison result; a control means responsive to the comparison result to select a number of said parallel-connected gain stages. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13)
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Specification