提出了一个基于动态源级负反馈和交叉耦合后失真调谐的可调谐跨导放大器单元(Gm),并采用此Gm单元搭建了3阶Gm-C滤波器来验证此Gm的性能.仿真结果表明,所设计的Gm单元的大信号恒定跨导V范围超过600 mV,在工艺角、电源电压、温度等变化时,滤波器-3 dB截止频率均可调谐到10 M Hz,调谐范围为9~26.4 M Hz,在10 M Hz频点等效输入噪声为39 nV,带内IIP3维持在16 dBm以上,功耗电流小于1.7 mA.
Abstract
This paper presents a tunable transconductor (Gm) cell
which is based on dynamic source degeneration and cross coupling technique
and builds a 3rd order Gm-C filter to prove the validity of this Gm cell.Simulation results reveal that
the Gm cell owns a constant transconductance (V) range of around 600 mV and the Gm -C filter has a tunable -3 dB cutoff frequency from 9 M Hz to 26.4 M Hz
equivalent input referred noise of 39 nV@10 M Hz
in-band IIP3 higher than 16 dBm and a total power consumption less than 1.7 mA over all variations of process corners