Patent
Radio transmitter having an output power control circuit
TLDR
In this article, a radio transmitter has an output power control circuit including a power amplifier, a directional coupler coupled to the power amplifier and a generator of a difference voltage between the output voltage of the detector means and a reference voltage.Abstract:
A radio transmitter has an output power control circuit including a power amplifier, a directional coupler coupled to the power amplifier, a detector of the forward power of the directional coupler, a generator of a difference voltage between the output voltage of the detector means and a reference voltage. A power regulator varys the output power of the power amplifier in response to the output of the difference voltage. The power applied from the power amplifier through the directional coupler to the detector is controlled by a control signal. The control circuit electrically varies the coupling coefficient of the directional coupler for attenuating the power applied from the directional coupler to the detector means to extend the controllable range of the transmitter output power.read more
Citations
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Patent
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Earl W. McCune,Wendell B. Sander +1 more
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References
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Patent
Protected amplifier apparatus
TL;DR: In this article, an amplifier incorporating various devices for detecting parameters such as average power, peak power and signal voltage is used to provide the feedback signals for automatic level control of an RF amplifier whose output signal is passed through an antenna coupler to an antenna.
Patent
Amplifier protection circuit
TL;DR: In this article, a protection circuit for a transmitter amplifier is provided which senses the forward power level and develops a first voltage which is compared with a reference voltage to provide a control voltage which controls the power developed by the transmitter amplifier.
Patent
Automatic tuning electric wave filter
TL;DR: In this article, the phase and signal level are sensed through directional couplers at the input and output ports of the filter, which act as matching sections to minimize the insertion loss.
Patent
Automatic control for amplitude-modulated signal source
TL;DR: In this article, an automatic level control is proposed to maintain an accurate output level measurement under conditions of high modulation index by developing a control signal proportional to the deviation of output level from a desired norm.
Patent
Amplifier protection circuit
TL;DR: In this paper, a protection circuit for a transmitter amplifier is provided which senses the forward power level and develops a first voltage which is compared with a reference voltage to provide a control voltage which controls the power developed by the transmitter amplifier.