Abstract
An architecture of a switched-capacitor integrator that includes a charge buffer operating in an open-loop is hereby proposed. As for the switched-capacitor filters, the gain of the proposed integrator, which is given by the input/output capacitor ratio, ensures desensitization to process, voltage, and temperature variations. The proposed circuit is suitable for low voltage supplies. It enables a significant power saving compared to a traditional switched-capacitor integrator. This was demonstrated through an analytical comparison between the proposed integrator and a traditional switched-capacitor integrator. The mathematical results were supported and verified by simulations performed on a circuit prototype designed in 16 nm finFET technology with 0.95 V supply. The proposed switched-capacitor integrator consumes 76 µW, resulting in more than twice the efficiency for the traditional closed-loop switched-capacitor filter as an input voltage equal to 31.25 mV at 7 ns clock period is considered. The comparison of architectures was led among the proposed integrator and the state-of-the-art technology in terms of the figure of merit.
Highlights
Switched-capacitor filters are used in a variety of applications like sensors interfaces [1], audio applications [2], RF front-ends [3], analog-to-digital converters [4], etc
The desensitization of the gain concerning the operational transconductance amplifiers (OTAs) parameters is reached as the gain depends only on the C1 and C2 capacitor ratio, in the ideal case
A transistor-level design of the proposed switched-capacitor circuit was performed in finFET 16 nm CMOS technology
Summary
Switched-capacitor filters are used in a variety of applications like sensors interfaces [1], audio applications [2], RF front-ends [3], analog-to-digital converters [4], etc. The high accuracy, comparable to the capacitors mismatch and the ease of reprogramming, makes this topology preferable. Such filters require high-performance operational transconductance amplifiers (OTAs). The proposed switched-capacitor integrator enables low voltage operation and relaxes the power requirement compared to the closed-loop counterpart. The paper is organized as follows: Section 2 starts with the analysis from the conventional switched-capacitor integrator used as a benchmark.
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