Design of a Sample & Hold Circuit Using a Two-Stage Class-AB operational transconductance amplifier
الموضوعات :
1 - گروه برق الكترونيك، واحد علي آباد كتول، دانشگاه آزاد اسلامي ، علي آباد كتول، ايران.
الکلمات المفتاحية: Operational Trans-Conductance Amplifier, OTA specifications, unity-gain bandwidth, Figures of Merits,
ملخص المقالة :
This paper introduces dc-gain enhancement circuit for CLASS AB Operational Trans conductance Amplifier (OTA). In this OTA, active loads and recycling folded cascade technique are employed to increase the DC-gain of the OTA by about 17dB without affecting the unity-gain bandwidth (UGBW), stability, power dissipation and output voltage swing of the conventional two-stage OTA. Using the nonlinear current mirror (NLCM) in the second stage the current of the output stage is increased. Therefore, the slew rate (SR) is improved. The proposed OTA is utilized in a flip-around sample-and-hold amplifier (SHA). The output spectrum of the SHA shows the total harmonic distortion of 0.0023%. The post-layout and Monte Carlo simulation results show that the proposed OTA has better performance than the state-of- the-art designs. The efficiently of the proposed OTA is evaluated by several simulations in 0.18μm, CMOS process whit the 1.8V supply voltage
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