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2014-11-29 01:33  
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Matched pair of FETs gives high input resistance for analog input signal greater than 1012 ohms, while output resistance of FET pair is under 12K. Opamp A1 acts as buffer and allows C1 to charge rapidly. Use of DG181 analog switches limits leakage current flowing into or out of C1, while SW2 provides fast resetting of capacitor voltage to zero. Similar FET pair and opamp provide output voltage proportional to sampled value.- Analog Switches and Their Applications, Siliconix, Santa Clara, CA, 1976, p 4-7-4-8.