考虑直流偏置抑制的载波电路设计

A Carrier Circuit Considered DC Bias Rejection Design

为解决模拟式三角波载波电路在输入信号误差波动时含有直流偏置等问题,提出考虑直流偏置抑制的载波电路。在积分电路后级环节设计比例积分(PI)控制电路,正向输入端接地设定参考值为零,积分输出三角波信号为被控量,通过PI调节使偏差接近于零,消除输出三角波中含有的直流偏量。经仿真与实验测试,对比分析经典三角波载波电路和考虑直流偏置抑制的载波电路输出波形,验证了所提设计方案可有效抑制输出载波中所含有的直流分量,输出标准三角波载波。

In order to solve the problem of direct current bias in the error fluctuation of the input signal of the analog triangular wave carrier circuit,a carrier circuit considered direct current bias rejection is proposed.The proportional integral(PI)control circuit is designed in the post-stage link of the integration circuit.The reference value is set to zero at the ground of the forward input terminal.The integrated output triangle wave signal is defined as the controlled quantity.Therefore,the deviation is close to zero through PI adjustment to eliminate the direct current bias contained in the output triangle wave.After simulation and experimental tests,the output waveform of the classical triangle wave carrier circuit and the carrier circuit considered direct current bias rejection are compared and analyzed.It is validated that the proposed design project can effectively suppress the direct current component contained in the output carrier and output the standard triangle wave carrier.