And the ways to optimize the circuit architecture , minimize the circuit nonidealities and improve the circuit performance are analyzed combined with the characteristics of the modulator architecture . based on it , the switched - capacitor integrator , class a amplifier , nonoverlap clock , voltage reference , comparator , feedback dac have been designed . in the end , the layout design is shown 調(diào)制器采用全差分開關(guān)電容電路實現(xiàn),并根據(jù)系統(tǒng)結(jié)構(gòu)特點就如何優(yōu)化電路結(jié)構(gòu)、克服電路中存在的非理想特性、提高電路性能作了具體分析,在此基礎(chǔ)上完成了開關(guān)電容積分器(開關(guān)、電容、運(yùn)算放大器) 、參考電壓源、比較器、兩相非交疊時鐘、反饋dac等模塊的電路結(jié)構(gòu)和參數(shù)設(shè)計。