Dynamic distortion control
AssigneeADC Telecommunications, Inc.
InventorJoseph F. Chiappetta
Life of this patent
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Abstract
A distortion monitor for a non-linear device is provided. The control circuit includes an input coupleable to receive a signal from the non-linear device and a first frequency monitor coupled to the input. The frequency monitor monitors the level of one of even and odd order distortion at a first frequency and creates a first signal indicative of the level of the distortion without the use of a pilot tone.
Claims30
A distortion monitor for a non-linear device, the distortion monitor comprising:
- an input coupleable to receive a signal from the non-linear device;
- and
- a frequency monitor, coupled to the input, that monitors the level of one of even and odd order distortion at a first frequency and that creates a signal indicative of the level of the distortion without the use of a pilot tone.
A control circuit for dynamic distortion control in a non-linear device, the control circuit comprising:
- an input coupleable to receive a signal from the non-linear device;
- a frequency monitor, coupled to the input, that monitors the level of odd order distortion at a frequency and that creates a signal indicative of the level of the distortion without the use of a pilot tone;
- and
- a controller, coupled to the frequency monitor to receive the first and second signals and to selectively create at least one control signal to control the non-linear device.
A control circuit for dynamic distortion control in a non-linear device, the control circuit comprising:
- an input coupleable to receive a signal from the non-linear device;
- a frequency monitor, coupled to the input, that monitors the level of even order distortion at a frequency and that creates a signal indicative of the level of the distortion without the use of a pilot tone;
- and
- a controller, coupled to the frequency monitor to receive the first signal and to selectively create at least one control signal to control the non-linear device.
A control circuit for dynamic distortion control in a non-linear device, the control circuit comprising:
- an input coupleable to receive a signal from the non-linear device;
- a first frequency monitor, coupled to the input, that monitors the level of one of even and odd order distortion at a first frequency and that creates a first signal indicative of the level of the distortion without the use of a pilot tone;
- a second frequency monitor, coupled to the input, that monitors the level of the other of even and odd order distortion at a second frequency and that creates a second signal indicative of the level of the distortion;
- and
- a controller, coupled to the first frequency monitor and second frequency monitors, that receives the first and second signals and that selectively creates at least one control signal to control the non-linear device.
An apparatus, comprising:
- an input, coupleable to receive an RF signal;
- a pre-distorter, coupled to the input, that selectively adds distortion to the RF signal;
- a non-linear device, coupled to the pre-distorter, that receives the RF signal from the pre-distorter to produce an output for apparatus;
- wherein the distortion added by the pre-distorter is controlled to reduce distortions in the output of the apparatus generated by the non-linear device;
- a distortion monitor, coupled to the output of the non-linear device, that monitors at least one frequency of the output of a transmitter to detect distortion in the output without the use of a pilot tone;
- and
- a microprocessor, coupled to the distortion monitor, the pre-distorter, and the non-linear device that uses an output of the distortion monitor to selectively generate at least one control signal for one of the non-linear device and the pre-distorter to reduce the distortion in the output of a transmitter.
An apparatus, comprising:
- a non-linear device that receives an input signal and produces an output signal;
- and
- a distortion monitor, coupled to the output of the non-linear device, that monitors at least one frequency of the output signal of the non-linear device to detect distortion without the use of a pilot tone.
Dependencies are inferred from the claim text.