低壓低功耗CMOS電流反饋運(yùn)算放大器設(shè)計(jì)
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結(jié)語
本設(shè)計(jì)在有關(guān)資料的基礎(chǔ)上,提出了自己設(shè)計(jì)的低壓低功耗電流反饋運(yùn)算放大器。在輸入級(jí)合理設(shè)置CCII+的W/L來提高其帶寬,避免了輸入級(jí)的迷勒補(bǔ)償。在輸出級(jí)使用了緩沖器,在開環(huán)時(shí),將輸出電阻減小到幾歐姆左右,極大的提高了負(fù)載能力。-3DB帶寬為23.3MHz,靜態(tài)功耗降低為為3.5mW。當(dāng)前,電流負(fù)反饋運(yùn)算放大器主要是基于雙極工藝的,但是隨著電源電壓的降低及芯片集成度的增加,對(duì)CMOS型電路的研究是很有必要的。
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