一种适用于低电压模数转换器的新型采样开关

发表于2007-12-18 460人浏览 1人跟帖总热度:279

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gogo2008

标签：电气专业论文 sampling switch； nonlinearity； low·voltage

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内容简介

A novel，highly linear sampling switch suitable for low-voltage operation is proposed．This switch not only eliminates the nonlinearity introduced by gate-source voltage variation。but also reduces the nonlinearity re．sulting from threshold voltage variation．which has not been accomplished in earlier low—voltage sampling swit—ches．This is achieved by adopting a replica transistor with the same threshold voltage as the sampling transistor．The effectiveness of this technique is dem onstrated by a prototype design of a sampling switch in 0．35vm ．The proposed sampling switch achieves a spurious free dynamic range of llldB for a 0．2MHz，1．2Vp·P input signal，sampled at a rate of 2MS／s。about 18dB over the Bootstrapped switch．Also，the oil-resistance variation is reduced bv 90％．This method is especially useful for low．voltage，high resolution ADCs，which is a hot topic today．

一种适用于低电压模数转换器的新型采样开关