Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. Abstract—Analog–Digital (A/D)… (More)
A switched-R-MOSFET-C filter with tunable corner frequency is described. The tunability is achieved by varying the clock duty cycle using an automatic tuning circuit. This tuning method does not involve a change in any gate voltage , and is therefore particularly suitable for low-voltage and high-linearity applications. The advantages of the proposed method… (More)
— The design and performance of a switched-R-MOSFET-C filter is presented in this paper. The filter achieves-77dB THD using a 0.6V supply, and-90dB THD using a 0.8V supply, with a 0.6Vpp differential 2kHz sine input. High linearity at a low supply voltage is achieved by the use of duty-cycle controlled tuning inside a feedback loop.
—Thermal noise represents a major limitation on the performance of most electronic circuits. It is particularly important in switched circuits, such as the switched-capacitor (SC) filters widely used in mixed-mode CMOS integrated circuits. In these circuits, switching introduces a boost in the power spectral density of the thermal noise due to aliasing.… (More)
Novel common-mode feedback circuits are proposed for use in pseudo-differential switched-capacitor circuits. They can be implemented by incorporating just four additional capac-itors (and switches) for an integrator, and only two additional capacitors for a residue gain amplifier. The circuits are applicable to very low-voltage switched-capacitor stages… (More)