摘要
设计了一种高精度宽带数字控制可变增益放大器,利用增益加强技术改进可变增益放大器的步进精度;同时,引入零点抵消技术,并加入源极负反馈电容,在不增加额外功耗的条件下,拓展了带宽。该电路采用0.18μm CMOS工艺,1.8V供电电源,增益动态范围为62dB,步进精度为1dB,步进误差为0.2dB。设计的可变增益放大器可以提供高达80MHz的带宽,整个电路消耗1.5mA电流,芯片尺寸为300μm×800μm。
A wideband digitally controlled gain amplifier （DGA） with high accuracy was presented, in which gain-boosting technology was used to improve gain step accuracy. A zero composed of source feedback resistance and source capacitance was introduced to offset the pole. Fabricated in 0. 18 μm CMOS process, the circuit occupied a chip area of 800μm×300μm. Test results showed that the DGA, which consumed less than 1.5 mA of power, had a gain control range of 62 dB by 1 dB step with a gain error less than 0.2 dB, and a 3 dB-bandwidth up to 80 MHz.
出处
《微电子学》
CAS
CSCD
北大核心
2012年第4期458-462,472,共6页
Microelectronics
基金
核高基重大专项(2009ZX01031-002-008)
关键词
数字控制
可变增益放大器
宽带
Digital control
Gain variable amplifier
Wideband
