Telecommunications – Transmitter – Power control – power supply – or bias voltage supply
Reexamination Certificate
2005-06-17
2008-03-04
Nguyen, Duc M. (Department: 2617)
Telecommunications
Transmitter
Power control, power supply, or bias voltage supply
C327S350000, C327S351000, C327S352000
Reexamination Certificate
active
07340227
ABSTRACT:
A wireless communication system uses a transmission power detection circuit. The transmission power detection circuit has excellent linearity of detection output for transmission output power and can obtain detection output not having temperature dependence. The transmission power detection circuit has a rectifying detection part that includes plural amplifiers connected in series and obtains detection output by taking out rectified outputs from emitters of input transistors of amplifiers of individual stages and synthesizing them. A compensation voltage generating circuit has a dummy amplifier having a construction similar to the amplifiers constituting the rectifying detection part and a coefficient circuit that changes output of the dummy amplifier at a specified ratio, and generates voltage for compensating temperature characteristics. Also included is an addition/subtraction circuit that obtains detection output free of temperature dependence by subtracting compensation voltage generated in the compensation voltage generating circuit from output voltage of the rectifying detection part.
REFERENCES:
patent: 5319264 (1994-06-01), Kimura
patent: 5471166 (1995-11-01), Kimura
patent: 5506537 (1996-04-01), Kimura
patent: 5631594 (1997-05-01), Kimura
patent: 2000-151310 (2000-05-01), None
Igarashi Yutaka
Yamamoto Akio
Yoshimi Daisuke
Mattingly, Stanger Malur & Brundidge PC
Nguyen Duc M.
Renesas Technology Corp.
Wang David
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