← 返回 JSSC 论文列表JSSC 2012第11期Analog Circuits0.18μm
A 05-V R-MOSFET-C Filter Design Using Subthreshold R-MOSFET Resistors and OTAs W
0.5V低功耗高线性度可调谐R-MOSFET-C滤波器设计
0.18μm CMOS, 0.5V, 91-268kHz可调, 61.0dB动态范围, 0.6mW
亚阈值R-MOSFET-C滤波器低电压线性电阻动态范围
▸创新点1:亚阈值R-MOSFET线性电阻技术,通过利用晶体管亚阈值工作区实现高线性电阻特性,解决了传统MOSFET电阻在低压(0.5V)下非线性严重的问题,其总谐波失真(THD)控制在1%以内。
▸创新点2:交叉前馈共模消除OTA设计,采用独特的共模信号抵消技术,显著提升了运算跨导放大器(OTA)的共模抑制比(CMRR),在0.5V超低电源电压下仍保持53.7dB的无杂散动态范围(SFDR)。
▸创新点3:片上PLL自动带宽调节系统,集成锁相环(PLL)实现滤波器带宽(91kHz-268kHz)的3:1动态调节,无需外部控制,功耗仅0.6mW,体现了系统级低功耗设计创新。
▸创新点4:全集成0.5V R-MOSFET-C滤波器架构,结合亚阈值电阻与改进OTA,在0.18μm CMOS工艺下实现61dB动态范围,突破了传统有源滤波器在超低压下的性能限制。
Abstract
A 0.5-V fully integrated R-MOSFET-C filter with
low power, good linearity, and wide frequency tunability is demon-
strated. It relies upon the operational transconductance ampli fier
using the cross-forward common-mode cancellation and the linear
sub-threshold R-MOSFET resistor—both employ subthreshold
operation of the transistors. A fifth-order Chebys hev low-pass
filter using regular transistors with a 0.5-V threshold voltage in
a 0.18-
m triple-well CMOS process is implemented for a 0.5-V
supply.