← 返回 JSSC 论文列表JSSC 2006第9期Analog Circuits0.18μm CMOS
2 GHz /81-Enhanced Active Filter With Low Passband Distortion and High
提出一种低通带失真、高动态范围的2 GHz 81增强型可调谐滤波器，采用交叉耦合差分对和LC谐振器技术。
2.0 GHz中心频率，130 MHz带宽，3%频率可调，6.6 dBm 1-dB压缩点，15 dB噪声系数，17 mW功耗
可调谐滤波器Q值增强低通带失真LC谐振器动态范围
▸使用交叉耦合差分对增强螺旋电感器的Q值
▸通过第二LC谐振器退化实现频率依赖性补偿
▸可直流电压控制的Q值增强技术
Abstract
A tunable /81-enhanced filter with low passband dis- tortion is presented. The /81of the on-chip spiral inductors that form the filter resonators is enhanced by using a cross-coupled dif- ferential pair which is degenerated by a secondLC tank. This tech- nique allows for frequency dependent compensation of inductor losses and ensures that the /81-enhanced LC resonators have a fre- quency behaviour close to the ideal in the passband of the filter. The circuit allows DC voltage control of /81-enhancement. The filter centered at 2.0 GHz with a 130 MHz bandwidth is tunable in fre- quency by 3%, exhibits a 6.6 dBm 1-dB compression point and a 15 dB noise figure while consuming 17 mW of DC power. The cir- cuit was fabricated in 0.18- m CMOS and the performance was verified experimentally.