Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1994-09-30
1995-08-15
Mottola, Steven J.
Amplifiers
With semiconductor amplifying device
Including gain control means
330133, H03G 330
Patent
active
054423228
ABSTRACT:
A control circuit for a multi-stage power amplifier (such as in a portable radio transmitter) compensates for fluctuations in ambient temperature, load, signal level and power supply voltage, The control voltage is set by comparing a biasing level which is related to the amplifier input signal level to a voltage proportional to the power supply current of the last stage of the amplifier. The control voltage resulting from the comparison establishes the operating point of the last stage of the power amplifier.
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Kornfeld Richard K.
Okazaki Mitsunari
Weiland Ana L.
Alps Electric Co.
Klivans Norman R.
Mottola Steven J.
Nguyen Tiep H.
Qualcomm Inc.
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