← 返回 JSSC 论文列表JSSC 2007第7期Analog Circuits0.13μm
A Switchable-Order G/109-C Baseband Filter With Wide Digital Tuning for Configurable
提出一种可数字调谐的Gm-C滤波器，适用于多标准蜂窝接收机。
0.13μm CMOS, 1.2V, 调谐范围25:1, 精度优于5%
Gm-C滤波器数字调谐跨导分割多标准接收机W-CDMA
▸创新点1：主从技术实现数字调谐（方法创新）。该技术通过主从架构实现滤波器截止频率的数字调谐，显著提高了调谐精度（优于5%）和灵活性，适用于从GSM到W-CDMA的多标准接收机。
▸创新点2：跨导分割技术固定参考频率（电路创新）。通过精确的跨导分割技术，将参考频率与滤波器截止频率解耦，确保了调谐过程的稳定性和独立性，解决了传统设计中频率依赖性问题。
▸创新点3：线性可调跨导器实现宽调谐范围（电路创新）。设计的线性可调跨导器支持超过25:1的调谐范围，显著提升了滤波器的适用性和性能，适用于宽频带应用场景。
▸创新点4：可切换阶数（三阶/五阶）Butterworth低通滤波器设计（系统创新）。通过可切换阶数设计，灵活适应不同应用需求，同时保持Butterworth滤波器的平坦通带特性，增强了系统的多功能性。
Abstract
A master/slave technique which allows digital tuning of a G -C filter’s cut-off frequency is proposed. It relies on an accurate transconductance division technique, fixing the reference frequency independently from the filter cut-off frequency. The design of a digitally-tunable G -C switchable third/fifth- order Butterworth low-pass filter in a 0.13- m 1.2-V CMOS process is also proposed. An extended tuning range (above 25:1) is obtained through the design of a linear very widely tunable transconductor. Measured results prove this chip to be compatible with the base- band part of direct-conversion cellular receivers, from GSM to W-CDMA, with a tuning accuracy better than 5% over the entire tuning range.