Narrow Results

In this paper, a comparator and an operational amplifier considered as essential components, constituting a 10-bit 50-MHz pipeline Analog-to-Digital Converter for Wireless Local Area Network (WLAN) applications, are described and designed. All post-layout and Monte-Carlo simulations, using a 0.35$\mu$m CMOS AMS process technology with $3.3$V supply voltage and an input common-mode range of $1.15–2.15$V, are achieved. An improved clocked comparator with a dynamic latch, based on a switched capacitor network, using the current reuse technique for slew rate enhancement and positive feedback for offset voltage compensation, is presented. The operational amplifier, consisting of a fully differential folded cascode operational transconductance amplifier, providing high-gain and good stability, is exhibited. A new frequency compensation technique, based on active resistors, is used to improve amplifier phase-margin. The Monte-Carlo performance results of the designed clocked comparator provide an offset voltage of $32.32$mV with $2.49$mV 3$\sigma$ deviation, a slew rate of $8.29$V/ns with $0.45$V/ns 3$\sigma$ deviation, and a propagation delay of $4.16$ns with $0.15$ns 3$\sigma$ deviation. Monte-Carlo performance results of the designed operational amplifier provide a phase-margin of $63.01^{\circ }$, and a high-gain of $79.22$dB with $1.92^{\circ }$ and $4.86$dB 3$\sigma$, respectively, by using $1\text{pF}$ load capacitance.