A switched capacitor biquad filter using current differencing transconductance amplifier (CDTA) is presented in this paper. The proposed circuit employs only one CDTA, two virtually grounded capacitors and one switche...A switched capacitor biquad filter using current differencing transconductance amplifier (CDTA) is presented in this paper. The proposed circuit employs only one CDTA, two virtually grounded capacitors and one switched capacitor. It is a resistorless circuit, so it is beneficial to IC implementation in terms of space consideration. The proposed circuit is a second order single input multiple output (SIMO) current-mode filter. This filter can simultaneously realize all basic filter functions high pass, low pass and band pass responses without any component-matching conditions. All the active and passive sensitivities are low. The natural angular frequency (ω0) and quality factor (Q) of proposed filter can be electronically controlled. Owing to current mode operation it consumes less power. PSPICE simulation results are used to verify the theoretical analysis.展开更多
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...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。展开更多
文摘A switched capacitor biquad filter using current differencing transconductance amplifier (CDTA) is presented in this paper. The proposed circuit employs only one CDTA, two virtually grounded capacitors and one switched capacitor. It is a resistorless circuit, so it is beneficial to IC implementation in terms of space consideration. The proposed circuit is a second order single input multiple output (SIMO) current-mode filter. This filter can simultaneously realize all basic filter functions high pass, low pass and band pass responses without any component-matching conditions. All the active and passive sensitivities are low. The natural angular frequency (ω0) and quality factor (Q) of proposed filter can be electronically controlled. Owing to current mode operation it consumes less power. PSPICE simulation results are used to verify the theoretical analysis.
文摘提出了一种具有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。
