Power control circuit used for both analog/digital dual mode
First Claim
1. A power control circuit useful for both analog and digital dual modes comprising;
- a power amplifier for amplifying a RF signal by a signal applied to a gain control terminal;
a variable attenuator for attenuating the RF signal by a signal applied to a attenuation control terminal;
a detector for detecting a power level of a RF output signal;
a comparator for generating a feedback signal by comparing a detected signal obtained from the detector with a standard voltage obtained from a standard voltage generator;
a switching circuit for applying the feedback signal to the gain control terminal of the power amplifier and applying a fixed bias voltage to the attenuation control terminal of the attenuator, so that the amplifier operates as a C class amplifier in the case of analog mode, and for applying the feedback signal to the attenuation control terminal of the variable attenuator and applying a predetermined bias voltage to the gain control terminal of the power amplifier so that the amplifier operates as an A class amplifier in the case of digital mode.
1 Assignment
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Accused Products
Abstract
A power control circuit used for both analog/digital dual mode is disclosed which comprises a switching circuit (17) for applying the feedback signal to the gain control terminal (40) of the power amplifier (2) and applying a fixed bias voltage to the attenuation control terminal (30) of the attenuator (10) so that the amplifier operates as a C class amplifier in the case of analog mode, and for applying the feedback signal to the attenuation control terminal (30) of the variable attenuator (10) and applying the predetermined bias voltage to the gain control terminal (40) of the power amplifier (2) so that the amplifier operates as an A class amplifier in the case of digital mode. In the present invention, as a single amplifier operates for both analog mode and digital mode, the configuration is simplified and assembled cheaply.
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Citations
3 Claims
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1. A power control circuit useful for both analog and digital dual modes comprising;
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a power amplifier for amplifying a RF signal by a signal applied to a gain control terminal; a variable attenuator for attenuating the RF signal by a signal applied to a attenuation control terminal; a detector for detecting a power level of a RF output signal; a comparator for generating a feedback signal by comparing a detected signal obtained from the detector with a standard voltage obtained from a standard voltage generator; a switching circuit for applying the feedback signal to the gain control terminal of the power amplifier and applying a fixed bias voltage to the attenuation control terminal of the attenuator, so that the amplifier operates as a C class amplifier in the case of analog mode, and for applying the feedback signal to the attenuation control terminal of the variable attenuator and applying a predetermined bias voltage to the gain control terminal of the power amplifier so that the amplifier operates as an A class amplifier in the case of digital mode. - View Dependent Claims (2, 3)
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Specification