Telecommunications – Transmitter – With feedback of modulated output signal
Reexamination Certificate
2005-07-12
2005-07-12
Trinh, Sonny (Department: 2687)
Telecommunications
Transmitter
With feedback of modulated output signal
C455S108000, C455S091000
Reexamination Certificate
active
06917791
ABSTRACT:
A polar loop transmitter circuit arrangement includes a circuit input, a circuit output and a controllable signal source. A modulator is coupled between the signal source and the output, whilst a first logarithmic amplifier is provided having its input coupled to the circuit input. A second logarithmic amplifier is also provided having its output coupled to the circuit output. An output of each logarithmic amplifier is coupled to a respective input of a comparator, and an output of the comparator is coupled to an input of the modulator. The logarithmic amplifiers can be successive detection logarithmic amplifiers, such amplifiers having an RF output which is amplitude limited and can be designed to have constant phase limited output.
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Gosling and Petrovic, Electronics Letters, 1979, 15(10) pp 286-288.
Kahn, Single Sideband Transmission by Envelope Elimination and Restoration, Proc. IRE 1952, 40, pp 803-806.
Dority & Manning P.A.
Trinh Sonny
Zarlink Semiconductor Limited
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