An independent tuning current-reuse Gm-C complex biquad is presented in this paper. By introducing extra freedoms, the proposed complex biquad achieves both independent tuning capability and higher linearity which are two big challenges preventing the reported current-reuse Gm-C filter from practical application. The prototype biquad is fabricated in standard 65-nm CMOS and the core circuit occupies 0.0512 mm². It consumes 0.072 mW under 1.2-V supply. Monte Carlo (MC) simulation shows the proposed biquad features more robustness to mismatch variation. The center frequency and bandwidth of the biquad are about 2 MHz and 1.2 MHz, respectively. Measurement results indicate IIP3 of −9.53 dBm with image rejection ratio (IRR) of 25.3 dB.

本文提出了一个独立的调谐电流重用Gm-C复合双二阶。通过引入额外的自由度，所提出的复杂双二阶同时实现了独立的调谐能力和更高的线性度，这是阻止报告的电流重用Gm-C滤波器实际应用的两个重大挑战。原型biquad采用标准的65 nm CMOS制造，核心电路占0.0512 mm ²。在1.2V电源下的功耗为0.072mW。蒙特卡洛（MC）仿真显示，所提出的双二阶特征对失配变化具有更强的鲁棒性。双二阶的中心频率和带宽分别约为2 MHz和1.2 MHz。测量结果表明IIP3为-9.53 dBm，镜像抑制比（IRR）为25.3 dB。