一种多输出压控电流差分跨导放大器的设计

The Design of a New Multiple Output Voltage Control CDTA

提出了一种具有Z端复制输出、跨导可由电压调节的电流差分跨导放大器(MO-VCCDTA)。该电路采用低压高性能电流镜作为电流输入级,降低了消耗的电压余度、输入阻抗与传输误差;利用MOS管的线性组合,实现了可由电压控制跨导的跨导放大级。采用SMIC 0.18μm CMOS工艺进行仿真,结果表明:在±0.9 V电源电压下,电路的线性输入范围为-100μA^100μA,输入电阻约为10Ω;跨导值可在0.34 m S^1.56 m S内线性变化,iz/ii、ix/ii的-3 d B带宽分别为131 MHz、88 MHz;电路总功耗为2.8 m W。最后,仅采用两个该模块和两个接地电容得到了电流模式通用二阶滤波器。

A new Z-copy current differencing transconductance amplifier（CDTA）with variable transconductance ad-justed by voltage is presented. Adopted a low voltage-high performance current mirror in the current input stage,the consumption of the voltage redundancy,input impedance and transmission error of this circuit are reduced;Based on the MOS linear composite cell,transconductance amplifier stage with voltage control transconductance is achieved. The circuit is designed by using SMIC 0.18 μm CMOS technology,the Spectre simulation results show that the current linear input range is from-100μA to 100μA in ＆#177; 0.9 V voltage source condition,the input imped-ance is 10Ω. The transconductance can be regulated from 0.34 mS to 1.56 mS,and the-3 dB bandwidths of iz/ii and ix/ii are 131 MHz and 88 MHz. The total power consumption is 2.8 mW. In addition,a current-mode universal bi-quad filter is acquired occupying only two MO-VCCDTA and two capacitors.