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A fully differential (FD) voltage buffer suited to low-voltage operation and able to operate over a wide voltage range is presented. The buffer core is based on a FD difference amplifier including bulk-driven MOS transistors as input devices. The common-mode (CM) component of the buffer output voltage is controlled by means of a bulk-driven CM feedback (CMFB) network that features an extended operating...
We present a low-voltage low-power CMOS tunable transconductor exploiting body gain boosting to increase the small-signal output resistance. As a distinctive feature, the proposed scheme allows the OTA transconductance to be tuned via the current biasing the gain-boosting circuit. The proposed transconductor has been designed in a 0.13-µm CMOS technology and powered from a 1.2-V supply. To show a...
An OTA-C filter implementation suited to low-voltage operation is presented. An operational transconductance amplifier (OTA) based on a bulk-driven input stage with enhanced DC gain and bandwidth was designed and included in a 1.2-V tunable fully differential second-order OTA-C lowpass filter. Experimental results, obtained in standard 0.35-µm CMOS technology, showed a dynamic range around 70 dB with...
An architecture for MDAC stages with low sensitivity to finite opamp gain is proposed, that allows designing high-precision pipeline ADCs in deep submicron technologies. The standard MDAC architecture is modified by inserting a voltage follower in the feedback path, and zero gain error is achieved if a relationship between the gain of the main opamp and of the opamp used in the voltage follower is...
In this paper we present a differential stage suitable to be used as the input stage of rail-to-rail very low-voltage opamps. The topology exploits an input level-shifter to keep the common-mode input voltage of a pseudo-differential pair constant, thus providing a constant gain over the whole input common-mode range. The main drawback of the proposed solution is the need of a switched-capacitor level-shifter,...
In this paper, a new CMOS exponential circuit with improved linear output range is presented. The proposed circuit is based on a new approximation function to increase the dB-linear output range. Simulation results in a 0.35 µm standard CMOS technology using HSPICE reveal an output range of 78 dB with errors less than ±1 dB. Also the Monte-Carlo simulation results for the threshold voltage variations...
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