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This paper introduces electronically tunable multiple-mode universal biquadratic circuits employing operational trans-conductance amplifiers (OTAs) and grounded capacitors. The basic current-mode circuit configuration is obtained from a second-order integrator loop structure consisting of loss-less integrators. The multiple-mode biquadratic circuits are constructed with additional OTAs to the current-mode...
This paper presents a new current-mode multiphase sinusoidal oscillator employing current-controlled current differencing transconductance amplifiers (CCCDTAs). The proposed oscillator circuit, which employs one CCCDTA, one grounded capacitor and one grounded resistor for each phase, can generate arbitrary n output current equal-amplitude signals that are equally spaced in phase (n being even or odd),...
The transimpedance limit describes the maximum transimpedance that a transimpedance amplifier (TIA) can attain for a given bandwidth and technology. We analyze and compare this limit for a wide variety of TIA topologies thus exposing their relative merits. The topologies considered are the shunt-feedback TIA with single and multistage amplifier, the shunt-feedback TIA with feedback capacitor, the...
A new DC offset compensation technique for voltage buffers is presented. It can used to improve the accuracy of data converters. This technique also compensates the finite gain error of the op-amp and it is fast compared to conventional techniques. As an application of this technique, a 10-bit current mode and a 10-bit voltage mode D/A converter are described. Simulation results in 0.5 mum CMOS technology...
A current-controlled current-mode multiphase sinusoidal oscillator employing translinear current conveyors is presented. The proposed oscillator circuit, which uses only one translinear current conveyor and one grounded capacitor for each phase and can generate arbitrary n signals which are equal in amplitude and equally spaced in phase. The oscillation frequency of each phase is independently tuned...
An artificial neural network (ANN) is utilized to characterize a current-mode capacitorless bandpass biquad based on a simple single-stage CMOS OTA. The training data is automatically collected from HSPICE simulations based on the AMS's 0.35 mu CMOS process. The trained ANN is able to indicate the feasibility of biquad's requirements with low probability of type-I and type-II error. The ANN-generated...
This paper describes a current-mode multifunction filter with a minimum number of active and passive elements using multi-output current followers (MO-CFs) as active elements. The proposed filter consists of only three MO-CFs and two grounded capacitors, which can simultaneously realize all the five standard biquadratic filter functions from the same configuration. The filter not only offers an independent...
This article presents a current-mode universal biquadratic filter (low-pass, high-pass, band-pass functions), based on multiple-output current controlled current conveyor transconductance amplifiers (MO-CCCCTAs). The features of the circuit are that: the quality factor and pole frequency can be tuned orthogonally via the input bias currents: the circuit description is very simple, consisting of merely...
In this paper a new generalized method for synthesis of current-mode log-domain filters, using nonlinear transconductance is presented. The nonlinear transconductance is designed by employing floating gate MOS (FG-MOS) transistors that operate in weak-inversion. It allows deriving current-mode nonlinear transconductance-capacitor (Gm-C) structure from its corresponding conventional transconductance-capacitor...
A genetical tuning scheme, implemented in MATLAB with the cooperation of HSPICE, is utilized to tune a capacitorless current-mode bandpass biquad employing a simple plusmn1.5V single-stage CMOS OTA, which is based on the AMSpsilas 0.35 mu CMOS process. The abilities of biquad, indicating the feasibility of such requirements, are examine through the extreme bias conditions. The very complex estimation...
In this paper, a general first order structure using dual output OTA is explored to derive new first-order and second-order filters using OTAs with dual outputs and grounded capacitors. Two first-order all-pass filters that have been obtained are presented together with an analysis of non-idealities of OTAs viz., finite bandwidth and parasitic output and input resistances and capacitances. Second-order...
A two-input two-output (TITO) current-mode universal biquad using only four dual-output operational transconductance amplifier (DO-OTAs) and two grounded capacitors is described. By appropriately connecting the input and output terminals, the proposed circuit can provide lowpass, bandpass, highpass, bandstop and allpass current responses. The filter also offers an independent electronic control of...
A universal current-mode active filter based on 2 types of integrator, lossy and lossless integrators, is presented. The biquadratic transfer function is obtained by the two integrators loop. The proposed circuit employs only 2 multiple output OTAs (MO-OTA) and 3 capacitors. The parameter Qp can be wide-range tuned independent from the omegap either changing of capacitor and transconductance gains...
The cascadable current-controlled current-mode multifunction filter with three inputs and one output using current differencing transconductance amplifiers (CDTAs) as active components is presented. The proposed configuration comprising only three CDTAs and two grounded capacitors provides low-input and high-output impedances, which is advantageous from an integration point of view and is important...
This paper presents the design method of very low-frequency current-mode low-pass filters for biomedical applications. The double-output operational transconductance amplifiers and grounded capacitors (DO-OTA-Cs) are used to realize the proposed low-frequency low-pass filters. The theory focuses mainly on establishing a relationship between the cascaded DO-OTA-Cs and the multiple-loop feedback connections,...
A novel on-chip compensated error amplifier for fast transient response of DC-DC converters is presented in this paper. The error amplifier uses on-chip current-mode Miller capacitor to replace a large off-chip capacitor. We only use three transistors and one voltage follower to implement this novel on-chip compensated error amplifier for fast transient DC-DC converters. Owing to the current-mode...
A current-mode "even"-nth-order OTA-C elliptic filter with the minimum components is presented in this paper. The filter, designed by the analytical synthesis method, is the counterpart of the recently reported current-mode "odd"-nth-order filter and features both current-mode signals and the important criteria of single ended input OTAs and grounded capacitors. Only (3n)/2 single-value...
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