Polar loop transmitter

Details Polar loop transmitter Polar loop transmitter

2005-01-18

2005-01-18

Kinkead, Arnold (Department: 2817)

Modulators

Amplitude modulator

Including stabilization or alternatively distortion, noise...

C332S162000, C375S295000, C330S136000, C455S109000, C455S115200, C455S126000

Reexamination Certificate

active

06844788

ABSTRACT:
A polar loop transmitter circuit arrangement includes a circuit input, a circuit output, a controllable signal source, a modulator connected between the signal source and the output, a first amplifier having its input connected to the circuit input, a second amplifier having its input connected to the circuit output, and a comparator. Each amplifier preferably includes respective amplitude detector and signal modifier portions connected in series between their respective inputs and outputs. An output of each of the amplifiers is connected to a respective input of the comparator, and an output of the comparator is connected to a control input of the modulator. The amplifiers may each be characterized by transfer functions that are generally logarithmic. Each amplifier's signal modifier portion may further include an analog-to-digital converter, a digital signal modifier, and a digital-to-analog converter. Additional signal mixer and/or phase comparison elements may also be incorporated into select embodiments of the subject polar loop transmitter technology.

REFERENCES:
patent: 4618999 (1986-10-01), Watkinson
patent: 20030073419 (2003-04-01), Chadwick
patent: 0 954 096 (1999-11-01), None
patent: 1 017 162 (2000-07-01), None
patent: 2 331 881 (1999-02-01), None
patent: 0124332.8 (2002-05-01), None
Petrovic and Kaya in their paper “Spurious Emissions from EER Type Transmitters,” ISBN 0903748630, Dec. 1985, pp 181-8.
Gosling and Petrovic in Electronics Letters, 1979, 15 (10) pp 286-288.
Kahn “Single Sideband Transmission by Envelope Elimination and Restoration,” Proc. IRE 1952, 40, pp 803-806.
Petrovic and Kaya in their paper “Spurious Emissions from EER Type Transmitters,” ISBN 0903748630, pp 181-8.

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