scholarly journals Advanced Readout System IC Current Mode Semi-Gaussian Shapers Using CCIIs and OTAs

VLSI Design ◽  
2007 ◽  
Vol 2007 ◽  
pp. 1-12 ◽  
Author(s):  
Thomas Noulis ◽  
Constantinos Deradonis ◽  
Stylianos Siskos
Keyword(s):  
Selection Criteria ◽  
Dynamic Range ◽  
Filter Design ◽  
Harmonic Distortion ◽  
Current Mode ◽  
Current Conveyors ◽  
Readout System ◽  
Fully Integrated ◽  
Operational Transconductance Amplifiers ◽  
Transconductance Amplifiers

Novel CMOS current mode shapers for front-end electronics are proposed. In particular, six semi-Gaussian shaper implementations based on second generation current conveyors and operational transconductance amplifiers are designed using advanced filter design techniques. Although all shaper architectures are fully integrated, they satisfy a relatively large peaking time. The topologies are analytically compared in terms of noise performance, power consumption, total harmonic distortion (THD), and dynamic range (DR) in order to examine which is the most preferable in readout applications. Design technique selection criteria are proposed in relation to the shaper structures performance. Analysis is supported by simulations results using SPICE in a 0.6 μm process by Austria Mikro Systeme (AMS).

scholarly journals Active-Only Sinusoidal Oscillator with Electronically-Tunable Fully-Uncoupled Frequency and Condition of Oscillation

2001 ◽  
Vol 24 (4) ◽  
pp. 233-241 ◽  
Author(s):  
Muhammad Taher Abuelmaatti
Keyword(s):  
Second Generation ◽  
Operational Amplifiers ◽  
Current Conveyors ◽  
Oscillator Circuit ◽  
Operational Transconductance Amplifiers ◽  
Sinusoidal Oscillator ◽  
Condition Of Oscillation ◽  
Transconductance Amplifiers ◽  
Electronically Tunable

A new active-only sinusoidal oscillator is presented. The oscillator circuit uses two internally compensated operational amplifiers, two plus-type second-generation current conveyors and three operational transconductance amplifiers. The proposed circuit enjoys the attractive features of totally uncoupled frequency and condition of oscillation, low sensitivities, electronic tunability and integratability.

scholarly journals Novel Reconnection-Less Reconfigurable Filter Design Based on Unknown Nodal Voltages Method and Its Fractional-Order Counterpart

2019 ◽  
Vol 25 (3) ◽  
pp. 34-38
Author(s):  
Lukas Langhammer ◽  
Roman Sotner ◽  
Jan Dvorak ◽  
Jan Jerabek ◽  
Peter A. Ushakov
Keyword(s):  
Fractional Order ◽  
Filter Design ◽  
Variable Gain Amplifier ◽  
Pass Band ◽  
Direct Transfer ◽  
Electronic Control ◽  
Operational Transconductance Amplifiers ◽  
Variable Gain ◽  
Transconductance Amplifiers ◽  
High Pass

A novel solution of reconnection-less electronically reconfigurable filter is introduced in the paper. The filter is designed based on unknown nodal voltages method (MUNV) using operational transconductance amplifiers (OTAs) and variable gain amplifier (VGA). The structure can provide all-pass, band-stop, high-pass 2nd order functions, high-pass function of the 1st order and direct transfer from the same topology without requirement of manual reconnection. The proposed structure also offers the electronic control of the pole frequency. Moreover, fractional-order design of the proposed filter is also provided. The behaviour is verified by simulations using Cadence IC6 (spectre) software.

HIGH-FREQUENCY LINEAR MULTIPLE-OUTPUT CMOS TRANSCONDUCTANCE AMPLIFIER FOR CURRENT-MODE FILTERS

2006 ◽  
Vol 15 (05) ◽  
pp. 701-717 ◽  
Author(s):  
HSIAO WEI SU ◽  
YICHUANG SUN
Keyword(s):  
High Frequency ◽  
Dynamic Range ◽  
Low Voltage ◽  
Filter Design ◽  
Current Mode ◽  
Cmos Process ◽  
Common Mode ◽  
Differential Input ◽  
Transconductance Amplifier ◽  
Linear Differential

A high-frequency highly linear tunable CMOS multiple-output operational transconductance amplifier (MO-OTA) for fully balanced current-mode OTA and capacitor (OTA-C) filters is presented. The MO-OTA is based on the cross-coupled pairs at the input and provides two pairs of differential outputs. A simple common-mode feedback (CMFB) circuit to stabilize the DC output levels of the MO-OTA is also proposed and two such CMFB circuits are used by the MO-OTA. The proposed MO-OTA is suitable for relatively low voltage (2.5 V) applications as its circuit has only two MOS transistors between the supply and ground rails. Simulated in a TSMC 0.25 μm CMOS process using PSpice, the MO-OTA has at least ± 0.3 V linear differential input signal swing with a single 2.5 V power supply and operates up to 1 GHz frequency. The MO-OTA has a THD less than -46 dB for a differential input voltage of 0.9 Vp-p at 10 MHz, dynamic range (DR) at THD = -46 dB is over 50 dB, and power consumption (with the common-mode feedback circuit) is below 8 mW for the whole tuning range. A fully balanced multiple loop feedback current-mode OTA-C filter example using the proposed MO-OTA is presented. This example also shows that the current-mode follow-the-leader-feedback (FLF) structure can achieve good performances for OTA-C filter design.

scholarly journals Novel Cascadable Current Mode Translinear-C Universal Filter

2004 ◽  
Vol 27 (4) ◽  
pp. 215-218 ◽  
Author(s):  
Sudhanshu Maheshwari ◽  
Iqbal A. Khan
Keyword(s):  
Dynamic Range ◽  
Transfer Functions ◽  
Harmonic Distortion ◽  
Current Mode ◽  
Pass Band ◽  
Universal Filter ◽  
High Impedance ◽  
Low Pass ◽  
Single Input ◽  
Band Pass

A novel cascadable current-mode universal filter employing three current-controlled conveyors (translinear conveyors) and two grounded capacitors is proposed. The circuit with single input and three high-impedance current outputs, ideal for cascading, realizes low-pass, band-pass, and inverting band-reject transfer functions. Inverting high-pass and inverting all-pass transfer functions are obtained by simply connecting the available outputs. The proposed circuit enjoys tuning through external currents, low total harmonic distortion (THD), good dynamic range, attractive sensitivity performance and is ideal for IC implementation.

Simple Current-Mode Square-Rooting Circuit with Temperature Compensation Using Only OTAs

2010 ◽  
Vol 47 (1) ◽  
pp. 23-30
Author(s):  
Worapong Tangsrirat ◽  
Danucha Prasertsom ◽  
Tattaya Pukkalanun ◽  
Wanlop Surakampontorn
Keyword(s):  
Theoretical Analysis ◽  
Temperature Compensation ◽  
Current Mode ◽  
Experimental Results ◽  
Current Gain ◽  
Operational Transconductance Amplifiers ◽  
Active Elements ◽  
Transconductance Amplifiers ◽  
Circuit Technique ◽  
Tuning Property

A simple current-controlled current-mode square-rooting circuit with temperature compensation employing operational transconductance amplifiers (OTAs) as active elements is proposed. It has been designed by using only four OTAs, without the employment of additional passive elements. The current gain of the proposed circuit can be electronically controlled, thanks to the tuning property of the OTA. Simulation and experimental results are obtained to verify the theoretical analysis of the proposed circuit technique.

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