Method for a transmitter to compensate for varying loading without an isolator
AssigneeMotorola, Inc.
InventorsLawrence F. Cygan, Paul H. Gailus, William J. Turney
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Abstract
A transmitter that includes an amplifying element, an antenna, a gain stage, and a closed loop feedback may compensate for varying antenna loads without an isolator. This may be accomplished by determining the effects of the varying loading on overall loop gain. Knowing the effects, the transmitter adjusts the gain of the gain stage to maintain a constant overall loop gain, thus eliminating the need for an isolator.
Claims8
A method for a transmitter to compensate for varying loading without utilization of an isolator, wherein the transmitter includes closed loop feedback, at least one linear amplifying element, an antenna, and at least one gain stage, wherein the closed loop feedback substantially maintains linear operation of the at least one amplifying element, the method comprises the steps of:
- a) determining, by the transmitter, effects of the varying loading on overall loop gain of the transmitter to determine overall loop gain changes;
- and
- b) adjusting, by the transmitter, gain of the at least one gain stage based on the overall loop gain changes to substantially maintain the overall loop gain at a predetermined gain level.
A method for a transmitter to compensate for varying loading without utilization of an isolator, wherein the transmitter includes closed loop feedback, at least one linear amplifying element, an antenna, a signal source, and at least one gain stage, wherein the closed loop feedback substantially maintains linear operation of the at least one amplifying element, wherein the signal source provides signals to the at least one linear amplifying element for amplification, and wherein the varying loading substantially occurs as a result of reflected energy being received by the antenna, the method comprises the steps of;
- a) determining, by the transmitter, a representation of the reflected energy
- b) adjusting, by the transmitter, signal source level of the signals provided by the signal source to the at least one amplifying element based on the representation of the reflected energy;
- the method further comprises the steps of:
- c) determining, by the transmitter, effects of the varying loading on overall loop gain of the transmitter to determine overall loop gain changes;
- d) adjusting, by the transmitter, the gain of the at least one gain stage based on the representation of the of the reflected energy and the overall loop gain changes to substantially maintain the overall loop gain at a predetermined gain level.
Dependencies are inferred from the claim text.