scholarly journals New Double Current Controlled CFA (DCC–CFA) Based Voltage–Mode Oscillator with Independent Electronic Control of Oscillation Condition and Frequency

2013 ◽  
Vol 64 (2) ◽  
pp. 65-75 ◽  
Author(s):  
Roman Šotner ◽  
Norbert Herencsár ◽  
Jan Jeřábek ◽  
Radek Dvořák ◽  
Aslihan Kartci ◽  
...  
Keyword(s):  
Integrated Circuit ◽  
Active Element ◽  
Frequency Tuning ◽  
Current Gain ◽  
Intrinsic Resistance ◽  
Current Feedback ◽  
Voltage Mode ◽  
Simultaneous Control ◽  
Bicmos Technology ◽  
Electronically Tunable

In this paper, a new electronically tunable quadrature oscillator (ETQO) based on two modified versions of current feedback amplifiers (CFAs), the so called double current controlled CFA (DCC-CFAs) is presented. The frequency of oscillation (FO) of the proposed voltage-mode (VM) ETQO is electronically adjustable by current gain or by varying the intrinsic resistance of the X terminal of the active element used. The condition of oscillation (CO) is adjustable by current gain independently with respect to frequency of oscillation. Simultaneous control of current gain and intrinsic resistance allows linear control of FO and provides extension of frequency tuning range. In the proposed circuit all the capacitors are grounded. The use of only grounded capacitors makes the proposed circuit ideal for integrated circuit implementation. The presented active element realized by using BiCMOS technology and the behavior of proposed circuit are discussed in details. The theoretical results are verified by SPICE simulations based on CMOS ON-Semi C5 0.5 μm and bipolar ultra high frequency transistor arrays Intersil HFA 3096 process parameters.

VARIOUS CURRENT-MODE AND VOLTAGE-MODE INSTRUMENTATION AMPLIFIER TOPOLOGIES SUITABLE FOR INTEGRATION

2010 ◽  
Vol 19 (03) ◽  
pp. 689-699 ◽  
Author(s):  
ERKAN YUCE
Keyword(s):  
Integrated Circuit ◽  
Experimental Tests ◽  
Current Mode ◽  
The Other ◽  
Operational Amplifiers ◽  
Instrumentation Amplifier ◽  
Nmos Transistor ◽  
Current Feedback ◽  
Voltage Mode ◽  
Current Feedback Operational Amplifiers

In this paper, four instrumentation amplifier (IA) topologies, one of which is current-mode (CM) while the others are voltage-mode (VM), are presented. Three of the IAs use one to two current feedback operational amplifiers (CFOAs) while the other one employs only a single NMOS transistor. One of the IA circuits, given as an example, is simple while others are novel. The CM IA is composed of only grounded resistors which have some advantages in integrated circuit (IC) process. Non-ideality effects such as non-ideal gain and parasitic impedances on the performance of introduced IAs are discussed. In order to show the performance of the circuits, we perform experimental tests and simulations by using SPICE program.

scholarly journals The voltage-mode first order universal filter using single voltage differencing differential input buffered amplifier with electronic controllability

2022 ◽  
Vol 12 (2) ◽  
pp. 1308
Author(s):  
Danupat Duangmalai ◽  
Peerawut Suwanjan
Keyword(s):  
Integrated Circuit ◽  
Universal Filter ◽  
Differential Input ◽  
First Order ◽  
Voltage Mode ◽  
Transconductance Amplifier ◽  
Low Pass ◽  
Simulation And Experiment ◽  
Electronically Tunable ◽  
High Pass

In this research contribution, the electronically tunable first-order universal filter employing a single voltage differencing differential input buffered amplifier (VD-DIBA) (constructed from two commercially available integrated circuit (IC): the operational transconductance amplifier, IC number LT1228, and the differential voltage input buffer, IC number AD830), one capacitor and two resistors. The features of the designed first order universal filter are as follows. Three voltage-mode first-order functions, low-pass (LP), all-pass (AP) and high-pass (HP) responses are given. The natural frequency (𝜔0) of the presented configuration can be electronically adjusted by setting the DC bias current. Moreover, the voltage gain of the LP and HP filters can be controllable. The phase responses of an AP configuration can be varied from 00 to −1800 and 1800 to 00. The power supply voltages were set at ±5 𝑉. Verification of the theoretically described performances of the introduced electronically tunable universal filter was proved by the PSpice simulation and experiment.

scholarly journals A CFOA-Based Voltage-Mode Multifunction Biquadratic Filter and a Quadrature Oscillator Using the CFOA-Based Biquadratic Filter

2019 ◽  
Vol 9 (11) ◽  
pp. 2304 ◽  
Author(s):  
San-Fu Wang ◽  
Hua-Pin Chen ◽  
Yitsen Ku ◽  
Po-Yu Chen
Keyword(s):  
Integrated Circuit ◽  
Input Impedance ◽  
Angular Frequency ◽  
High Input ◽  
High Input Impedance ◽  
Current Feedback ◽  
Quadrature Oscillator ◽  
Voltage Mode ◽  
Biquadratic Filter ◽  
Band Pass

This paper proposes a new high-input impedance current feedback operational amplifier (CFOA)- based voltage-mode multifunction biquadratic filter and a voltage-mode quadrature oscillator using the proposed high-input impedance CFOA-based biquadratic filter. The proposed high-input impedance CFOA-based voltage-mode multifunction biquadratic filter uses three CFOAs, three resistors, and two grounded capacitors with two inputs and three outputs. The filter can simultaneously realize non-inverting low-pass, non-inverting band-pass, and non-inverting band-reject filtering functions at the high-input impedance terminal while the inverting band-pass and non-inverting high-pass filtering functions can also be obtained by applying another high-input impedance terminal. The filter offers orthogonal control of resonance angular frequency and quality factor. The proposed high-input impedance CFOA-based voltage-mode multifunction biquadratic filter can be used to implement a voltage-mode quadrature oscillator with an independently controlled the frequency of oscillator and the condition of oscillation. The OrCAD PSpice simulation and experimental results of the commercially available integrated circuit, AD844AN, are used to confirm the characteristics of the proposed filter and oscillator.

Four-Input One-Output Voltage-Mode Universal Filter Using Simple OTAs

2019 ◽  
Vol 28 (05) ◽  
pp. 1950078 ◽  
Author(s):  
Montree Kumngern ◽  
Pichai Suksaibul ◽  
Fabian Khateb
Keyword(s):  
Integrated Circuit ◽  
Pass Band ◽  
Cmos Process ◽  
Passive Component ◽  
Universal Filter ◽  
Voltage Mode ◽  
Programmable Filter ◽  
Digitally Programmable ◽  
Low Pass ◽  
Electronically Tunable

This paper presents a new electronically tunable voltage-mode universal filter with four-input one-output employing six simple operational transconductance amplifiers (OTAs), two grounded capacitors and two MOS resistors. The use of grounded passive components is beneficial for integrated circuit implementation. The proposed filter can realize low-pass, band-pass, high-pass, band-stop and all-pass filtering functions without active and passive component-matching conditions and inverting-type input signals requirements. The natural frequency and quality factor can be tuned independently and electronically by adjusting the bias currents. The voltage-mode filter offers the features of high-input impedance and low active and passive sensitivities. The characteristics of the proposed universal filter are verified using PSPICE simulators through 0.35[Formula: see text][Formula: see text]m CMOS process. Experimental results are used to confirm the workability of proposed circuit through LM13600 commercially available OTAs. Also a digitally programmable filter is shown to confirm the advantage of multiple-input universal filter.

scholarly journals Practical realization of electronically adjustable universal filter using commercially available IC-based VBDA

2020 ◽  
Vol 41 (3) ◽  
Author(s):  
Tattaya Pukkalanun ◽  
Worapong Tangsrirat ◽  
Natchanai Roongmuanpha
Keyword(s):  
Integrated Circuit ◽  
Practical Realization ◽  
Universal Filter ◽  
Voltage Mode ◽  
Filter Performance ◽  
Single Output ◽  
Transconductance Amplifier ◽  
Biquadratic Filter ◽  
Theoretical Finding ◽  
Electronically Tunable

This paper describes the practical realization of electronically adjustable voltage-mode universal filter with three inputs and single output (TISO) using the commercially available integrated circuit (IC)-based voltage differencing buffered amplifiers (VDBAs). The realization is resistor-less and contains only two VDBAs and two capacitors. The described filter structure can realize all the five standard biquadratic filter functions from the same configuration without needing any component matching criterions. It also exhibits low-output impedance, which enables for easy cascading in voltage-mode operation. Owing to practical VDBA realization, the filter circuit can be easily made electronically tunable with orthogonal o-Q tuning. The effects of the VDBA non-idealities on the filter performance have been analyzed in detail. To prove the theoretical finding, the performance of the studied circuit was also experimentally measured using the operational transconductance amplifier

scholarly journals A 2-bit, 3.1 GS/s, band-pass DSM receiver for active antenna systems

2013 ◽  
Vol 5 (3) ◽  
pp. 329-334 ◽  
Author(s):  
Udo Karthaus ◽  
Stephan Ahles ◽  
Ahmed Elmaghraby ◽  
Horst Wagner
Keyword(s):  
Integrated Circuit ◽  
Dynamic Range ◽  
Noise Figure ◽  
Base Stations ◽  
Active Antenna ◽  
Single Carrier ◽  
Bicmos Technology ◽  
Band Pass ◽  
Time Band ◽  
Antenna Systems

This paper presents a radio frequency (RF) continuous-time band-pass delta sigma modulator (CT BP DSM) receiver realized in a 180 nm SiGe BiCMOS technology. It also provides an introduction to active antenna systems (AAS) for cellular infrastructure base stations, which is the target application for this RF integrated circuit (IC). The internal quantizer and feedback digital to analog converter (DAC) resolution of the CT BP DSM is 2 bit. Without applying DAC linearization techniques such as trimming or dynamic element matching being utilized, measured performance parameters include an SNR and SNDR in 35 MHz bandwidth of 56.7 and 53.7 dB, respectively. IIP3 and noise figure are −6.6 dBm and 10 dB, respectively. No image reception is noticeable within a measurement dynamic range of 83 dB. When driven by single-carrier and three-carrier W-CDMA signals, adjacent channel leakage ratio (ACLR) is −62.6 and −52.1 dB, respectively, making the design also suitable as a modulator for a class-S power amplifier.

scholarly journals Minimum dropout voltage on a serial pnp transistor of a moderately loaded voltage regulator in a gamma radiation field

2012 ◽  
Vol 27 (4) ◽  
pp. 333-340 ◽  
Author(s):  
Vladimir Vukic
Keyword(s):  
Integrated Circuit ◽  
High Current Density ◽  
Negative Influence ◽  
Radiation Hardness ◽  
Voltage Regulators ◽  
Current Gain ◽  
Voltage Regulator ◽  
Emitter Current ◽  
Moderate Load ◽  
Loaded Voltage

The main examined value in an experiment performed on moderately loaded voltage regulators was the serial pnp transistor?s minimum dropout voltage, followed by the data on the base current and forward emitter current gain. Minimum dropout voltage decreased by up to 12%, while the measured values of the forward emitter current gain decreased by 20-40% after the absorption of a total ionizing dose of 500 Gy. The oxide trapped charge increased the radiation tolerance of the serial lateral pnp transistor owing to the suppression of interface trap formation above the base area. Current flow through the serial transistor of the voltage regulator had an influence on the decrease in the power pnp transistor?s forward emitter current gain. Due to the operation with a moderate load of 100 mA, loss of emitter injection efficiency was not as important as during the operation with high current density, thus eliminating the negative influence of emitter crowding on the radiation hardness of the voltage regulator. For a moderate load, gain in the negative feedback reaction was enough to keep output voltage in the anticipated range. Only information procured from tests of the minimum dropout voltage on the moderately loaded voltage regulators were not sufficient for unequivocal determination of the examined integrated circuit?s radiation hardness.

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