Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1996-07-30
1997-07-08
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including gain control means
330284, H03G 330
Patent
active
056465785
ABSTRACT:
The present invention is directed to a wide dynamic range power amplifier having a power amplification circuit for increasing the power of an incoming signal to an output power suitable for transmitting the signal over a communication medium, and a feedback circuit coupled between the output and gain control input of the power amplification circuit for changing the output power to a new, desired output power.
The feedback circuit may include a digital step attenuator, a power detector, a reference D.C. voltage, and a comparator. To change the output power, the digital step attenuates the output power sensed by the power detector, from a first attenuation level to a second attenuation level, by an amount corresponding to the desired change in output power. The power conversion circuit converts the output power at the second attenuation level to a D.C. voltage for comparison with the reference D.C. voltage which corresponds to the output power at the first attenuation level. The comparator increases the gain of the power amplification circuit, and thereby the output power, by an amount corresponding to the difference between the D.C. voltage and the reference D.C. voltage, until the D.C. voltage equals the reference D.C. voltage.
REFERENCES:
patent: 4709403 (1987-11-01), Kikuchi
patent: 5150075 (1992-09-01), Hietala et al.
patent: 5204637 (1993-04-01), Trinh
patent: 5208550 (1993-05-01), Iwane
Loh Koon Whye
Pathak Yatish Swarup
Lucent Technologies - Inc.
Mottola Steven
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