Temperature compensated wide dynamic range power detection circu

Details Temperature compensated wide dynamic range power detection circu Temperature compensated wide dynamic range power detection circu

1996-07-02

1998-08-18

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including temperature compensation means

330110, 330140, H03F 130, H03G 320

Patent

active

057963096

ABSTRACT:
A detector for a portable telephone or the like samples RF transmit power, detects the sampled signal using a Schottky diode and uses a logarithmic amplifier to apply a compressive function to the post-detection signal. The compressive function emphasizes power level changes at the low end of the transmission spectrum and de-emphasizes power level changes at the high end of the transmission spectrum. In this way, the range of detected powers required to be processed by subsequent circuitry is reduced, thereby simplifying the design of the circuit. To improve stability of the detector with respect to temperature fluctuations, the semiconductor element in the amplifier which provides its logarithmic characteristics is temperature-compensated, as is the detector diode.

REFERENCES:
patent: 3904971 (1975-09-01), Delagrange
patent: 4263560 (1981-04-01), Ricker
patent: 4523155 (1985-06-01), Walczak et al.
patent: 4560949 (1985-12-01), Young
patent: 4602218 (1986-07-01), Vilmur et al.
patent: 4760347 (1988-07-01), Li et al.
patent: 4791380 (1988-12-01), Chiappetta
patent: 5099204 (1992-03-01), Wheatley, III
Turner: "Schottky diode pair makes an rf detector stable", Electronics, May 2, 1974, pp. 94-95, (Also see Application p. 2).

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