Simulink Behavioral Modeling of a 10- bit Pipelined ADC

Abstract

The increasing architecture complexity of data converters makes it necessary to use behavioral models to simulate their electrical performance and to determine their relevant data features. For this purpose, a specific data converter simulation environment has been developed which allows designers to perform time-domain behavioral simulations of pipelined analog to digital converters (ADCs). All the necessary blocks of this specific simulation environment have been implemented using the popular Matlab simulink environment. The purpose of this paper is to present the behavioral models of these blocks taking into account most of the pipelined ADC non-idealities, such as sampling jitter, noise, and operational amplifier parameters (white noise, finite DC gain, finite bandwidth, slew rate, and saturation voltages). Simulations, using a 10-bit pipelined ADC as a design example, show that in addition to the limits analysis and the electrical features extraction, designers can determine the specifications of the basic blocks in order to meet the given data converter requirements.

Telescopic Op-Amp Optimization for MDAC Circuit Design

“…The MDAC is a single switched capacitor circuit that can be implemented the function of S/H operation, D/A conversion, subtraction, and amplification of the remainder. With the charge conservation concept, the output in hold phase is given by [2]:…”

“…3. The implementation of the MDAC stage is shown in Fig. 3 [2]. During the first phase, the input signal is sampled onto the sampling capacitors C S and C F .…”

“…ADCs can be found in a wide range of applications, spanning from imaging to ultrasound and communication systems. In particular, pipelined ADC architecture [1][2][3] offers a good trade-off between conversion rate, resolution and power consumption.…”

Comparative study of two CMOS operational amplifiers for high performance pipelined ADC

“…where Cs is the sampling capacitor, Cf is the feedback capacitor, and VDAC is the output voltage of the sub-DAC circuit in MDAC [2].…”

“…ADCs can be found in a wide range of applications, spanning from imaging to ultrasound and communication systems. In particular, pipelined ADC architecture [1][2][3] offers a good trade-off between conversion rate, resolution and power consumption. Operational amplifiers are one of the most widely used building blocks for analog and mixed-signal systems.…”