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The paper introduces a novel sinusoidal quadrature oscillator (QO) with low harmonic distortion. The oscillator utilizes the non-linear non-inertial principle for amplitude stabilization and thus a fast transition to 0 steady state oscillations should be accomplished. This feature makes the QO suitable for operation at very low frequencies. The oscillator operates in the current-mode and is is intended...
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,...
Current sensing amplifier is one of the basic blocks in biosensing interfaces as current-related phenomena are at the base of biological and chemical interfaces. A wide number of papers have been published in literature on the subject showing both continuous time (CT) and discrete time (DT) approaches. Among them, CT solutions show better performance in terms of input-referred noise floor due to the...
A low-noise transconductance amplifier (LNTA) aimed at continuous-time ΣΔ wideband frontend is presented. In this application, the LNTA operates with a capacitive load to provide high linearity and sufficient Gm gain over a wide frequency band. By combination of various circuit techniques the LNTA, which is designed in 65nm CMOS, achieves in simulation the noise figure less than 1.35 dB and linearity...
This paper presents a novel approach to design a programmable-bandwidth amplifier intended for ultra-low-power switched-capacitor application. The proposed topology is based on the common load-compensated two-stage OTA. The GBW is enhanced by replicating the second amplifying stage. Implemented in a 65-nm CMOS technology and approved by the post-layout simulation, the GBW is programmed in three operation...
Bioelectrical impedance measurements can be used in a wide range of clinical applications for monitoring and tissue characterization. Bioimpedance measurement applications need current drivers with high output impedance and stable current injection in the frequencies from DC to about 10 MHz. This paper presents an improved current driver based on a pair of balanced operational transconductance amplifiers...
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...
In this paper a novel CMOS latch is designed using a class-AB transconductor as a core. The static latch behavior is studied using a homotopy method which allows highlighting sufficient conditions for the transconductor to become a latch. These last conditions are general and can be used for the design of new latches and comparators. The proposed latch features high speed together with high power...
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...
In this paper a new current-mode precision full-wave rectifier using is presented. It uses only single dual-X second generation current conveyor and two diodes. The main advantage of the proposed circuit is the high-impedance output, hence, by appropriate loading, voltage response can also be obtained. Using the CMOS implementation of the active element, the performance of the rectifier is analyzed...
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