Capacitor Mismatch Compensation for the Quasi-Passive Switched-Capacitor DAC
نویسندگان
چکیده
A method to eliminate the effect of capacitor mismatch for a switched-capacitor DAC is described. The method consists of two elements. The first element is the use of a compensating switching algorithm, which can eliminate the effect of capacitor mismatch only for some digital input values. The second element is that each digital word is written as the sum of two other words for which the capacitor mismatch can be eliminated. These words are converted and the corresponding voltages are summed.
منابع مشابه
A switched-capacitor DAC with analog mismatch correction
This paper describes a background calibration method for enhancing the accuracy and linearity of a switched-capacitor digital-to-analog converter. It can be used alone or in combination with mismatch shaping to achieve very high accuracy and linearity combined with high speed.
متن کاملMismatch-Shaped Pseudo-Passive Two-Capacitor DAC
A simple mismatch-shaping scheme is proposed for a two-capacitor DAC. Unlike in other mismatchshaping systems, the shaped error is generated by direct ltering of a well-de ned bounded signal, which can be generated as white noise. The operation is closely related to a speci c digital interpolation lter, but arbitrary properties of the overall interpolation characteristic can be assured. Simulat...
متن کاملA Low-Voltage, Low-Power, Two-Stage Amplifier for Switched-Capacitor Applications in 90 nm CMOS Process
Abstract- A novel low-voltage two-stage operational amplifier employing resistive biasing is presented. This amplifier implements neutralization and correction common mode stability in second stage while employs capacitive dc level shifter and coupling between two stages. The structure reduces the power consumption and increases output voltage swing. The compensation is performed by simple mill...
متن کاملA Very Accurate Averaging Circuit Technique for the Switched Capacitor DAC
A simple and efficient method for improving the linearity of a two capacitor charge redistribution digital to analog converter (DAC) is presented. This method utilizes consecutive interchanging of the voltages on the capacitors for each bit being converted. It is shown that the accuracy achieved by the proposed algorithm is orders of magnitude higher compared to this of the conventional method....
متن کاملA 2.7mW 2MHz Continuous-Time ΣΔ Modulator with a Hybrid Active-Passive Loop Filter
Abstract We present a 5-order continuous-time Σ∆ modulator with a hybrid active-passive loop filter consisting of only three amplifiers. The passive integrators save power, and introduce no distortion. The active integrators provide gain and minimize internal noise contributions. A single-bit switched-capacitor DAC is employed as the main feedback DAC for high clock jitter immunity. An addition...
متن کامل