A CMOS transconductance amplifier architecture with wide tuning range for very low frequency applications
A CMOS transconductance amplifier architecture with wide tuning range for very low frequency applications
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DOI：
10.1109/jssc.2002.1004583
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发表时间：
2002-08
期刊：
影响因子：
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通讯作者：
A. Veeravalli;E. Sánchez-Sinencio;J. Silva-Martínez
中科院分区：
文献类型：
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作者：
A. Veeravalli;E. Sánchez-Sinencio;J. Silva-Martínez
设计了一种具有宽调谐范围和大输入电压摆幅的伪差分CMOS运算跨导放大器（OTA），用于非常小的G/sub / M/ s（数量级为几纳安培/伏）。OTA基于改进的四象限乘数架构，具有当前除法。提出并设计了一种利用浮栅晶体管处理大差分信号的共模反馈电路结构。通过阻抗缩放电路模拟了大型片上电容器。该电路以1.2-/spl μ m CMOS工艺制作，已用于设计四阶带通滤波器和弛豫振荡器。实验结果与理论结果吻合较好。
A pseudodifferential CMOS operational transconductance amplifier (OTA) with wide tuning range and large input voltage swing has been designed for very small G/sub M/'s (of the order of a few nanoamperes per volt). The OTA is based on a modified four-quadrant multiplier architecture with current division. A common-mode feedback circuit structure has been proposed and designed using floating-gate transistors to handle large differential signals. Large on-chip capacitors are emulated through impedance scaling circuits. The circuits, fabricated in a 1.2-/spl mu/m CMOS process, have been used to design a fourth-order bandpass filter and a relaxation oscillator. Experimental results are in good agreement with the theoretical results.