A tunable high-frequency operational transconductance amplifier (OTA) is presented along with its application in the implementation of a Gm-C filter. The OTA is tuned by varying the negative resistance produced by a positive feedback at the output. Post-layout simulation results (using TSMC 90 nm CMOS technology and a 1-V supply voltage) show that the differential DC gain, common-mode gain and OTA unity gain frequency are 34 dB, −26 dB and 10 GHz, respectively. Moreover, for precise control of filter performance, an auto-tuning circuit is presented to adjust the filter cutoff frequency at low power consumption (i.e., 0.6 mW, about 16.3% of the total circuit power consumption). The filter has a cutoff frequency of 1 GHz with a group delay variation less than 6% up to 1.3 f_c. The size of filter is 0.040 × 0.023mm² and the third order intermodulation (IM3) value at cutoff frequency is −37 dB. The Monte Carlo simulation results are presented for predicting the manufacturing process errors.

提出了一种可调式高频运算跨导放大器（OTA）及其在Gm-C滤波器实现中的应用。通过改变输出端的正反馈产生的负电阻来调整OTA 。布局后的仿真结果（使用TSMC 90 nm CMOS技术和1V电源电压）显示，差分DC增益，共模增益和OTA单位增益频率分别为34 dB，-26 dB和10 GHz。此外，为了精确控制滤波器性能，提出了一种自动调谐电路，以在低功耗（即0.6 mW，约占总电路功耗的16.3％）下调节滤波器的截止频率。该滤波器的截止频率为1 GHz，在1.3 f _c之前的群时延变化小于6％。。滤波器的大小为0.040×0.023mm ²，截止频率处的三阶互调（IM3）值为-37 dB。给出了蒙特卡洛模拟结果，以预测制造过程中的误差。