Power amplifying apparatus for wireless transmitter
First Claim
1. A power amplifying apparatus having power amplifying means composed of a plurality of power amplifiers, for controlling the electric power outputted from said power amplifying means to a predetermined electric power level by using a feedback control, comprising:
- power controlling means for outputting a control signal so as to obtain a desired output of the electric power from said power amplifying means,first controlling means for fetching a monitor voltage from said power amplifying means, converting said monitor voltage into a predetermined level on the basis of said control signal from said power controlling means, and controlling the converted monitor voltage in a feedback control to feedback said converted monitor voltage into a predetermined power amplifier of said power amplifying means, anda second controlling means for receiving said control signal from said power controlling means and for controlling a predetermined power amplifier of said power amplifying means according to the received control signal.
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Accused Products
Abstract
A power amplifying apparatus according to the present invention can provide a stable electric power output with wide range by controlling both of the output amplifier for amplifying the electric power and the pre-amplifier disposed at the front of the output amplifier. Furthermore, in order to avoid the disadvantage that a transmission spectrum is expanded because of no supply of a stable voltage to be supplied to the electric power amplifier, thereby producing a cross-talk, a stabilizing power source circuit is provided to stabilize the voltage between the power amplifier and the power source for supplying the voltage.
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Citations
20 Claims
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1. A power amplifying apparatus having power amplifying means composed of a plurality of power amplifiers, for controlling the electric power outputted from said power amplifying means to a predetermined electric power level by using a feedback control, comprising:
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power controlling means for outputting a control signal so as to obtain a desired output of the electric power from said power amplifying means, first controlling means for fetching a monitor voltage from said power amplifying means, converting said monitor voltage into a predetermined level on the basis of said control signal from said power controlling means, and controlling the converted monitor voltage in a feedback control to feedback said converted monitor voltage into a predetermined power amplifier of said power amplifying means, and a second controlling means for receiving said control signal from said power controlling means and for controlling a predetermined power amplifier of said power amplifying means according to the received control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 19, 20)
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15. A power amplifying apparatus having power amplifying means composed of a plurality of power amplifiers, for controlling the electric power outputted from said power amplifying means to a predetermined electric power level by using a feedback control, comprising;
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said power amplifying means having an output stage amplifier and a pre-stage amplifier disposed at a front stage of said output stage amplifier; power controlling for means outputting a control signal so as to obtain a desired output electric power from said power amplifying means; first controlling means for fetching a monitor voltage from said power amplifier, converting said monitor voltage into a predetermined level on the basis of said control signal from said power controlling means, and controlling the converted monitor voltage in a feedback control to feedback said converted monitor voltage into said output means of said power amplifying means, and a second controlling means for fetching the output electric power from said pre-stage amplifier, converting said monitor voltage into a predetermined level on the basis of the control signal from said electric power controlling means, and controlling the converted monitor voltage by effecting a feedback control to said pre-stage amplifier of said power amplifying means. - View Dependent Claims (16, 17, 18)
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Specification