Method and apparatus for controlling an amplifier
First Claim
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1. A method for controlling the operation of an amplifier, comprising the steps of:
- measuring a characteristic of an output signal of the amplifier;
measuring a peak value of the characteristic;
measuring a time-averaged mean value of the characteristic;
comparing the peak value to the mean value;
providing a demand signal representing a required value of the peak to mean comparison; and
adjusting a bias level applied to the amplifier so as to generate an output signal having the desired level of the peak to mean comparison.
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Abstract
A method and apparatus are described for controlling the operation of an amplifier, in which, a bias level applied to the amplifier is adjusted so as to generate an output signal having the desired level of peak to mean ratio.
9 Citations
20 Claims
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1. A method for controlling the operation of an amplifier, comprising the steps of:
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measuring a characteristic of an output signal of the amplifier;
measuring a peak value of the characteristic;
measuring a time-averaged mean value of the characteristic;
comparing the peak value to the mean value;
providing a demand signal representing a required value of the peak to mean comparison; and
adjusting a bias level applied to the amplifier so as to generate an output signal having the desired level of the peak to mean comparison. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. Apparatus for controlling an amplifier to achieve a desired peak envelope to mean envelope ratio in the output signal of such amplifier comprising:
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a detector generating for a first value, representative of an output power envelope of a signal from such amplifier;
a peak detector for determining a peak value of the first value;
an averaging means for determining a mean value of the first value;
a subtracter for subtracting the mean value from the peak value, to obtain a difference value;
a subtracter for subtracting the difference value from a demand signal to produce a bias signal for controlling such amplifier according to the difference between the difference value and the demand signal, so as to achieve a required peak-to-mean ratio of the output signal. - View Dependent Claims (14, 16, 17, 18, 19, 20)
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15. Apparatus according 13, wherein the detector is a linear detector, the first value is a linear representation of the output power envelope, and the demand signal is adapted to operate with the difference value to produce the required adjustment to the bias signal, to control the amplifier as required, wherein the difference value represents the difference between the peak value of the output power envelope and the mean value of the output power envelope.
Specification