Switched-op amp technique is an effective technique for designingnlow-voltage switched-capacitor circuits. The only drawback with thisnapproach is the difficulty in designing the front-end interface to thenexternal input, In this paper, front-end interface structures with widensignal swing and no voltage boosting are proposed. Based on anconventional 1.2-Μm CMOS process, a front-end interface was designednand implemented. For a 1-V supply, the interface dissipates 80 ΜW.nThe track mode THD was measured to be -78 dB for a 600-mV peak-to-peaknoutput suing, and the maximum sampling rate was measured to be 600 kS/snfor a capacitive load of 20 pf
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