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A comparator-based buffer is proposed to enhance the driving capability of high-gain amplifiers with switched-capacitor loads. A simple correction scheme using a resistor in the charging path and a correction phase reduces the overshoot of the output voltage. SPECTRE simulations verify the effectiveness of the proposed scheme. [ABSTRACT FROM AUTHOR]

A simple and highly efficient successive-approximation registers (SAR) ADC realisation is proposed. It requires an opamp, a comparator and only three equal-valued capacitors. The proposed scheme is insensitive to the capacitor parasitics, and has a small capacitance spread. With an oversampled scheme, it also allows noise-shaping the remaining quantisation error. It is well-suited for low-frequency instrumentation and measurement applications, and for use in extended-counting ADCs. [ABSTRACT FROM AUTHOR]

A new tuning technique is proposed for Gm-C filters. The transconductance cells are tuned using switched resistors (SRs), which change the equivalent reference resistance of each cell. In the tuning circuit, the equivalent resistance of an SR branch is forced to equal that of a switched-capacitor (SC) branch by a feedback loop containing a continuous-time comparator. Thus, using the output of the loop all time constants of the Gm-C filter can be tuned simultaneously. The simulation of a second-order Butterworth filter is described to verify the effectiveness and excellent linearity of the proposed tuning method. [ABSTRACT FROM AUTHOR]