Circuitry and method for power calibration

Details Circuitry and method for power calibration Circuitry and method for power calibration

1997-03-31

1999-09-28

Chin, Wellington

Telecommunications

Transmitter

455126, 455127, 455116, 330137, 330279, 375297, 375312, H04B 102, H03G 320, H04K 102

Patent

active

059603330

ABSTRACT:
A method and circuitry for improved output power level calibration/compensation/control is disclosed. A single RF detector diode is employed, to which a bias current is applied prior to applying a coupled amount of the transmitted radio frequency signal to be measured during a level calibration or automatic level control function. The initial (pre-RF) voltage out of the detector circuit is stored and later subtracted from the detector's output voltage after application of the RF signal. This results in a voltage proportional only to the detected RF signal, independent of any circuit-dependent voltages and variations due to environmental conditions such as temperature fluctuation, and allowing precise control of the output power levels.

REFERENCES:
patent: 4841301 (1989-06-01), Ichihara
patent: 5196806 (1993-03-01), Ichihara
patent: 5371473 (1994-06-01), Trinh et al.
patent: 5423081 (1995-06-01), Thiele et al.
patent: 5515008 (1996-05-01), Ueda et al.

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