ABSTRACT

A novel operational transconductance amplifier (OTA) having high gain and high bandwidth for high-speed analog communication techniques and precision filtering is designed in this paper. The designed OTA uses β-multiplier-based current biasing scheme with folded cascode amplifier scheme in order to improve the small signal models and the DC gain of circuit. The OTA design was carried out using TSMC 65 nm CMOS technology using Cadence Virtuoso tool with 1 V supply voltage and 10 pf capacitive load. The output DC gain was found to be approximately 75.3 dB. In addition, the unity gain frequency for the designed OTA was found to be around 200 MHz. Superior common mode rejection ratio, power supply rejection ratio and slew rates along with compact chip area and low power are other salient features of the designed OTA. The designed OTA can be employed in order to design high performance analog circuits like data converters, phase-locked loops, etc.

摘要

本文设计了一种用于高速模拟通信技术和精密滤波的高增益和高带宽新型运算跨导放大器（OTA）。所设计的OTA采用基于β乘法器的电流偏置方案和折叠级联放大器方案，以改善小信号模型和电路的直流增益。OTA 设计采用 TSMC 65 nm CMOS 技术，使用 Cadence Virtuoso 工具，电源电压为 1 V，容性负载为 10 pf。发现输出直流增益约为 75.3 dB。此外，发现设计的 OTA 的单位增益频率约为 200 MHz。卓越的共模抑制比、电源抑制比和压摆率以及紧凑的芯片面积和低功耗是设计的 OTA 的其他显着特点。