New versatile building blocks for implementing analog functional circuits such as a multiplier, a squarer, and a square rooter based on functional terms of a differential input circuit are proposed and implemented in 0.25 um CMOS process. The input range of these circuits is over ±1.0 V with a high linearity of less than 4% for 3.3 V power supply. The -3 dB bandwidth of all discussed circuits has been measured to over 200 MHz. The functional circuit size is 340 lm 2 , and its typical power consumption is about 90 uW.
In this paper, we propose a new approach to thermometer-to-binary encoder of Flash ADCs. Instead of integrating bubble error correction circuit as previous approaches, proposed approach integrates a bubble error detection circuit. The advantage of this approach is that it can handle all types of bubble error whereas previous approaches often deal with first-order bubble error only. Simulation results show that the bubble error detection circuit consumes very little energy.
A novel track-and-hold (T&H) employing an operational transconductance amplifier (OTA) with two cross-coupled differential pairs (CCDPs) is proposed for high-accuracy and high-frequency applications. The T&H has a simple architecture requiring smaller capacitors and fewer switches and offers higher speed, lower distortion, and lower power dissipation than its op-amp based counterparts. The chip implemented in 0.35 µm CMOS process operates from a single 1.8 V supply and achieves more than 10-bits precision for sampling rate in excess of 120 MS/s.
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