混合模式AGC设计
doi: 10.3724/SP.J.1146.2006.01196
The Design of Mixed-Mode AGC
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摘要: 该文提出了一种混合模式AGC，在不需要A/D转换器的条件下可以获得较好的线性，同时采用粗调与细调相结合的方法大大地降低了系统的稳定时间。该设计基于1st Silicon 0.25m 标准CMOS工艺，仿真表明，当输入信号幅度在100mV到1.3V范围内变化时，输出信号的幅度为800mV25mV，系统的稳定时间小于3.2s；当输入信号幅度为1V时，输出信号的THD低于－45dB；AGC的最大功耗为10mW。Abstract: A mixed-mode AGC is proposed in this paper. The peak value of the output signal is detected by an analog peak detector. The detected peak is then processed by the following comparator and control logic. The gain of the VGA is controlled by the output of the control logic. The AGC is designed based on 0.25m standard CMOS technology. The supply voltage is 2.5V. The simulation results show that the amplitude of the output signal is 800mV25mV when the input amplitude ranges from 100mV to 1.3V. The THD of the output signal is less than 45dB when the input amplitude is 1V, and the power consumption is 10mW.
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