← 返回 JSSC 论文列表JSSC 2015第10期RF & Wireless0.18μmTransceiver
A 50450 MHz Tunable RF Biquad Filter Based on a Wideband Source Follower With 2
基于宽带源跟随器的50450 MHz可调RF双二阶滤波器设计
0.18μm CMOS, 1.8V, 14mA, 50-450MHz可调, 26dBm IIP3, 15dB噪声系数
射频滤波器源跟随器双二阶滤波器宽带系统噪声抑制
▸采用亚1源跟随器替代传统运放缓冲器，改善噪声系数和带宽
▸通过改变源跟随器在滤波器中的位置提升阻带抑制性能
▸有效抑制缓冲器的直流失调电压和闪烁噪声
Abstract
This paper reports a source follower-based active
RC filter topology for RF front-ends in wideband systems. In
the proposed active RC filter, the noise figure and bandwidth
are improved through adopting the proposed sub-1
source follower, which replaces the conventional operational
amplifier-based unity gain buffer and through simply changing
its location in the filter. Applying the proposed scheme to the
conventional Sallen–Key filter also improves the stopband re-
jection performance. Furthermore, t