Transmitter circuits and apparatus of wireless application

Details Transmitter circuits and apparatus of wireless application Transmitter circuits and apparatus of wireless application

2011-01-18

2011-01-18

Pan, Yuwen (Department: 2618)

Telecommunications

Transmitter

With feedback of modulated output signal

C455S091000

Reexamination Certificate

active

07873333

ABSTRACT:
In conventional polar-loop transmitter circuits, using two feedback circuits intended to control the amplitude in an open loop and phase of a power output in closed loop, respectively, during transmission, causes current consumption to increase during delivery of a small power output. Therefore, a complex table has to be prepared in order to correct the nonlinearities in the amplitude-to-amplitude characteristic of the power amplifier and the amplitude-to-phase characteristic thereof. In order to reduce the current consumption required for the delivery of a moderate or small power output, a polar-loop transmitter circuit in which two feedback circuits intended to control the amplitude and phase of the power output respectively are active when the power amplifier delivers a large power output exhibiting strong nonlinearity, and when the power amplifier delivers a moderate or small power output, the amplitude of the power output is controlled in the open loop.

REFERENCES:
patent: 6295442 (2001-09-01), Camp et al.
patent: 7424276 (2008-09-01), Yamawaki et al.
“Highly Integrated Radio Transceiver with Power Amplifier for GSM/GPRS/EDGE Applications” Polaris™ 2 TOTAL RADIO™ Total Radio Solution 2005.
Electronics Letters 10thMay 1979, vol. 15 No. 10., pp. 286-288.

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