DIGITAL AMPLITUDE MODULATION DEVICE AND DIGITAL AMPLITUDE MODULATION METHOD

摘要

A digital amplitude modulation device includes power amplifiers, a compositor, a filter, a measurement unit, a protection unit, and a controller. The power amplifiers are arranged in parallel and amplify an input signal in accordance with ON control and stop output in accordance with OFF control. The filter suppresses an unnecessary component to generate an AM signal. The measurement unit measures a measurement value between the filter and a signal output terminal and output the AM signal generated by the filter. The protection unit includes a calculator and a first processing unit. The calculator is formed from an analog circuit and calculates an evaluation value based on the measurement value. The first processing unit is formed from an analog circuit and generates a first control signal by referring to the evaluation value. Upon receiving the first control signal, the controller OFF-controls the power amplifiers.

主权项

1. A digital amplitude modulation device comprising:
a plurality of power amplifiers arranged in parallel and configured to amplify an input signal in accordance with ON control and stop output in accordance with OFF control; a compositor configured to composite signals output from the power amplifiers to generate a composite signal; a filter configured to suppress an unnecessary component of the composite signal generated by the compositor to generate an AM (Amplitude Modulation) signal in an RF (Radio Frequency) band; a measurement unit configured to measure a measurement value between the filter and a signal output terminal configured to output the AM signal in the RF band generated by the filter; a protection unit including a calculator formed from an analog circuit and configured to calculate an evaluation value based on the measurement value measured by the measurement unit, and a first processing unit formed from an analog circuit and configured to generate a first control signal for OFF-controlling the plurality of power amplifiers based on the calculated evaluation value; and a controller configured to ON-control and/or OFF-control the plurality of power amplifiers by referring to an amplitude level of a modulated signal, and upon receiving the first control signal OFF-control the plurality of power amplifiers.