摘要
介绍了一个应用在无刷电机上的开关式磁敏传感器中的高灵敏度斩波放大器的设计,它能够有效地放大Hall片产生的低频微弱信号。该电路应用斩波技术抑制放大器的低频噪声和失调,采用跟踪-保持解调器进一步减少由调制器开关引起的残余失调。在Candence环境下用1.5μCMOS工艺模型进行仿真,该放大器能有效的消除5 mV的输入失调电压且能减少由调制器开关引起的残余失调,而不需要任何的滤波器。
Described a highly sensitive CMOS chopper amplifier for a monolithic magnetic hall sensor. It is realized by using chopper stabilization technique to overcome the low frequency noise and drift problems. In order to eliminate the residual offset due to the input switching transient spikes, choose a track-and-hold （T/H）-based demodulation. A spectre simulation of the circuit was performed using 1.5 μ CMOS model parameters,an amplitude of 0.5 mV of the amplifier input offset and low-frequency input noise can be effectively eliminated, without requiring any low-pass filtering.
出处
《仪表技术与传感器》
CSCD
北大核心
2007年第4期53-55,共3页
Instrument Technique and Sensor
关键词
斩波放大器
残余失调
跟踪-保持解调器
chopper amplifier
residual offset
track-and-hold-based demodulation
