Burst control circuit for use in TDMA communications system
AssigneeNEC Corporation
InventorsKazuya Hashimoto, Daiji Horikoshi
Life of this patent
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Abstract
A burst control circuit for use in a TDMA communications system comprises a power amplifier having two separate control terminals. A level control signal which is the difference between a reference signal and the level of the output burst signal of the amplifier, feedback-controls the level of the output burst signal through a first control terminal, and a waveform control signal having a predetermined waveform, controls the waveform of the output burst signal through a second control terminal. When the level of the reference signal is decreased, the amplitude of the waveform control signal is decreased as a function of the level of the reference signal.
Claims7
A burst control circuit for use in a TDMA communications system comprising:
- power amplifier means having first and second control terminals for amplifying an input radio signal to produce an output burst signal, said amplifier means changing the level and waveform of said output burst signal in response to level and waveform control signals which are supplied through said first and second control terminals, respectively;
- ALC circuit means for generating a level control signal on the basis of a signal representing a difference between the level of a reference signal and the level of said output burst signal, and supplying the generated level control signal to said first control terminal as said level control signal;
- and
- waveform control circuit means for generating a waveform control signal having a predetermined waveform and an amplitude which is a function of the amplitude of said reference signal, and supplying the generated waveform control signal to said second control terminal as said waveform control signal.
A method of controlling a burst signal, comprising the steps of:
- generating a level control signal on the basis of a signal representing a difference between the level of a reference signal and the level of an output burst signal;
- generating a waveform control signal having a predetermined waveform and an amplitude which is a function of the amplitude of said reference signal;
- and
- amplifying an input radio signal to produce said output burst signal in accordance with said level and waveform control signals.
Dependencies are inferred from the claim text.