电子设计工程
電子設計工程
전자설계공정
ELECTRONIC DESIGN ENGINEERING
2014年
23期
132-134
,共3页
跨导放大器%输出阻抗%开环增益%共源共栅放大器%THD%PSpice
跨導放大器%輸齣阻抗%開環增益%共源共柵放大器%THD%PSpice
과도방대기%수출조항%개배증익%공원공책방대기%THD%PSpice
transconductance amplifier%output impedance%open-loop gain%cascode amplifier%THD%PSpice
跨导放大器能向负载输出与输入电压成正比的电流，电流大小与负载无关，所以也称为可编程电流源。为了增强输出阻抗，提高开环增益，改善跨导放大器在大电流时同时保持宽频带的性能，提出了一种用于大电流放大器中的跨导单元的新设计理论，同时展示了两种优化电路，并用PSpice对该设计建模，仿真结果对优化理论进行了验证。
跨導放大器能嚮負載輸齣與輸入電壓成正比的電流，電流大小與負載無關，所以也稱為可編程電流源。為瞭增彊輸齣阻抗，提高開環增益，改善跨導放大器在大電流時同時保持寬頻帶的性能，提齣瞭一種用于大電流放大器中的跨導單元的新設計理論，同時展示瞭兩種優化電路，併用PSpice對該設計建模，倣真結果對優化理論進行瞭驗證。
과도방대기능향부재수출여수입전압성정비적전류，전류대소여부재무관，소이야칭위가편정전류원。위료증강수출조항，제고개배증익，개선과도방대기재대전류시동시보지관빈대적성능，제출료일충용우대전류방대기중적과도단원적신설계이론，동시전시료량충우화전로，병용PSpice대해설계건모，방진결과대우화이론진행료험증。
The transconductance amplifier can produce output current to the load that is proportional to the input voltage. One thing must be mentioned is that the magnitude of the current has nothing to do with the load. So we call it programmable current source as well. In order to enhance the output impedance , improve open-loop gain and the property of keeping wide band in high current of the transconductance amplifier, a new approach is proposed. At the same time, two kinds of enhanced circuit are described and are proved by PSpice simulation. The simulation results verified that the enhanced theory is of course correct.
