An area‐efficient switched‐capacitor relaxation oscillator with digitally controlled frequency tunability

Abstract

SUMMARYThis paper describes a programmable low-jitter switched-capacitor (SC) square-wave oscillator for the use in a variety of voice-band signal-processing applications. The core of the circuit is a relaxation oscillator whose oscillation frequency programmability does not resort to variations either in capacitor values or in the sampling frequency. As a result, total capacitance is reduced and, hence, silicon area is minimized while low phase jitter and high resolution programmability are achieved. Simulation results referred to the design of an SC oscillator in 0.35-m CMOS technology are presented to demonstrate the feasibility of the proposed approach.

A new efficient SC integrator scheme for high‐speed low‐power applications

“…Switched-capacitor (SC) circuits are widely used in modern electronic systems [1][2][3][4][5][6][7][8][9][10]. In particular, SC integrators are building blocks in filters [1] and analog-to-digital converters (ADCs) [3][4][5][6][7] whose speed, accuracy and power consumption are severely affected by the performances of SC integrators.…”

“…‡ ‡ The interested reader can refer, for example, to the analysis carried out by the authors in 2 for two‐stage op‐amps with current‐buffer Miller compensation used in SC applications.…”