Coded data generation or conversion – Analog to or from digital conversion – Nonlinear
Patent
1992-08-31
1994-08-02
Hoff, Marc S.
Coded data generation or conversion
Analog to or from digital conversion
Nonlinear
330129, H03M 162, H03M 184, H03M 188
Patent
active
053349792
ABSTRACT:
According to this invention, a power controller includes a power amplifier, a detector, a digital/analog converter, and a power control unit. The amplifier amplifies RF signal input on the basis of an applied control voltage to output a RF power. The detector detects the RF power from the power amplifier to output a detection voltage. The digital/analog converter converts externally input digital data into a reference voltage to output the reference voltage. The power control unit compares the reference voltage from the digital/analog converter means with the detection voltage from the detector to output the control voltage. The digital/analog converter has conversion characteristics in which a rate of change in reference voltage corresponding to a change in digital data is set to be low in a high sensitive output region of a feedback system constituted by the power amplifier, the detector, and the power control circuit and is set to be high in a low sensitive output region.
REFERENCES:
patent: 3999181 (1976-12-01), Hirsch
patent: 4363024 (1982-12-01), Brokaw
patent: 4476437 (1984-10-01), Fujiwara
patent: 4546326 (1985-10-01), Van Uffelen et al.
patent: 5126686 (1992-06-01), Tam
patent: 5128629 (1992-07-01), Trinh
patent: 5132634 (1992-07-01), Suarez
patent: 5159283 (1992-10-01), Jensen
patent: 5196806 (1993-03-01), Ichihara
Hoff Marc S.
NEC Corporation
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