Attenuation control voltage determining method, attenuation control voltage determining device and ALC (automatic level control) circuit

Abstract

The invention discloses an attenuation control voltage determining method, an attenuation control voltage determining device and an ALC (automatic level control) circuit. The method includes when a sampling period reaches, sampling voltage signals output by a detecting circuit in the ALC circuit to acquire sampling voltage of a current sampling period; on the basis of the sampling voltage of the current sampling period and power voltage of a previous sampling period, determining power voltage of the current sampling period; according to a preset comparison table of the power voltage and attenuation control voltage, and determining the attenuation control voltage corresponding to the power voltage of the current sampling period to serve as the attenuation control voltage of the current sampling period to be used for controlling attenuation parameters of a radio frequency attenuation circuit in the ALC circuit before the attenuation control voltage of a next sampling period is determined. By the method, the device and the ALC circuit, power control effect, on output signals of power amplification equipment, of the ALC circuit is improved.

Description

technical field [0001] The present invention relates to the field of radio frequency technology in the field of communication technology, in particular to a method, device and ALC circuit for determining an attenuation control voltage applicable to time slot signal communication equipment. Background technique [0002] In a wireless communication system, a power amplifier is usually used to amplify the power of the signal in transmission, so as to ensure sufficient power strength of the signal and expand the coverage of the signal. When the power amplifier performs power amplification on the received signal, when the output power of the power amplifier exceeds the rated output power, it will cause severe signal distortion, affect the communication quality, and even damage the equipment. To solve this problem, a control and protection circuit capable of limiting the maximum output power of the power amplifier is generally added to the power amplifier device, and this circuit ...

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Problems solved by technology

[0014] Embodiments of the present invention provide a method and device for determining an attenuation control voltage, and an ALC circuit to solve the problem in the prior art that the ALC circuit has a poor power control effect on the output signal of a power amplification device

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