【摘要】 设计了一种自动增益控制(AGC)放大器。该AGC放大器使用线性跨导技术的可变增益放大器(VGA),可实现较好的线性度。利用下峰值检测电路检测信号大小和简洁的调整电路控制VGA增益,并设计了一种无启动电路的带隙基准电路为整个系统提供基准电压。经过SMIC的0.35μm CMOS工艺仿真验证,结果表明,所设计的自动增益控制放大器可以实现100kHz的信号从54.12 dB的输入动态压缩到7.36 dB的输出。更多还原

【Abstract】 An automatic gain control(AGC) amplifier for CMOS image sensor has been designed.The AGC amplifier adopts translinear a variable gain amplifier(VGA) to realize a good linearity.It detects valley to present the strength of signal,and uses a succinct adjustment circuit to control the gain of VGA.A bandgap reference that does not need start—up circuit has been designed for the whole system.Simulated in SMIC 0.35μm CMOS,it can compress the dynamic range of 54.12 dB input to 7.36 dB output.更多还原