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US 2004/0176049 A1Published application
RF transmitters with saturation detection and correction and methods therefor
AssigneeMotorola, Inc.
InventorsThomas Nagode, Patrick Pratt, Dale Schwent
Life of this patent
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Abstract
Methods in radio communications devices having a transmitter with an integral control loop, and in other integral control systems, including generating a first error signal (210) based upon an amplifier output signal and a corrected reference signal, generating a second error (220) signal based on a closed loop integral control signal applied to a control input of the amplifier and based on an integral control reference signal, and generating the corrected reference signal (230) by correcting a reference signal based upon the first and second error signals.
Claims8
A radio communications device, comprising:
- a transmitter having a modulator with an output coupled to an input of an amplifier;
- an integral control device having an integral control output coupled to a control input of the amplifier;
- an error signal circuit having a feedback input coupled to an output of the amplifier, the error signal circuit having a corrected reference input and an error output coupled to an error input of the integral control device;
- an integral control device controller having an input coupled to the integral control output of the integral control device, the integral control device controller having a controlled output coupled to the amplifier control input, the integral control device controller having a limit reference input;
- a reference signal control circuit having a first input coupled to the first error output of the error signal circuit, an error output of the integral control device controller coupled a second reference control input of the reference signal control circuit;
- a reference signal correction circuit having a reference input, a reference control output of the reference signal control circuit coupled to a reference control input of the reference signal correction circuit.
3 more elements
Dependencies are inferred from the claim text.