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针对中频采样模数装换器中的宽带采样/保持电路,提出了一种新颖的电荷交换补偿(CEC)技术.该技术通过消除采样开关有限导通电阻的影响,补偿了采样带宽,并避免了时钟馈通和电荷注入的加剧.同时设计了具有AB类输出的低功耗两级运放,在1.8V电源下为该采样/保持提供了3V峰-峰值的输入范围.该采样/保持电路在100Ms/s的采样率下,对于200MHz输入信号达到了94dB的无杂散动态范围.在5.5pF的负载下,功耗仅为26mW.
A novel charge exchange compensation (CEC) technique is proposed for the wideband sample / hold circuit in the IF sampling modulo converter, which compensates for the sampling bandwidth by eliminating the effect of the limited on-resistance of the sampling switch and avoids Increased clock feedthrough and charge injection while designing a low-power, two-stage operational amplifier with class AB output that provides a 3V peak-to-peak input range for this sample / hold at 1.8V. The circuit achieves 94dB of spurious-free dynamic range for a 200MHz input signal at a sampling rate of 100Ms / s, consuming only 26mW at a 5.5pF load.