Self generating square/triangular wave and pulse width modulator using a single MO-CCCDTA
01 Jan 2018-Analog Integrated Circuits and Signal Processing (Springer US)-Vol. 94, Iss: 1, pp 177-193
Abstract: A self-generating square/triangular wave and pulse width modulator (PWM) using multiple output current controlled current differencing transconductance amplifier (MO-CCCDTA) is presented. To obtain all the three functions simultaneously from the same topology, the MO-CCCDTA is modified a little bit. The characterisation of the modified MO-CCCDTA structure shows that the parasitic resistances at input terminals (n and p) can be varied via bias current. The maximum useful frequency range is found to be 635 MHz, which is higher than the available literature. The waveform generator and PWM circuit use only one MO-CCCDTA, one grounded capacitor and no resistor; hence suitable for IC implementation. The duty cycle of proposed pulse width modulation can be tuned by bias current of MO-CCCDTA over a wide range. The performances of the proposed block and its applications (square/triangular/PWM) are verified by PSPICE simulation using TSMC 0.35 µm technology. The power consumption is about 1.12 mW. To verify experimentally, a prototype of MO-CCCDTA has been made using commercially available ICs (AD844AN and CA3080) on printed circuit board. The simulation and experimental results verify theoretical proposition well. Monte carlo simulation is carried out, which proves satisfactory performance of the proposed circuit against mismatches. The performance of the proposed circuit is also verified through pre-layout and post-layout simulation results. The required chip area is only 22.415 × 14.6 µm2.
Citations
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TL;DR: In this article, a novel design for third order chaotic and hyperchaotic oscillator with cubic nonlinearity using single operational trans-resistance amplifier (OTRA) and few passive elements is reported.
Abstract: This research paper reports a novel design for third order chaotic and hyperchaotic oscillator with cubic nonlinearity using single operational trans-resistance amplifier (OTRA) and few passive elements. The key nonlinear dynamical characteristics in terms of sensitivity, divergence, equilibrium point and Lyapunov exponent are recorded in this literature. The operational activity of the proposed oscillator based on OTRA is integrated using 0.25 µm TSMC CMOS parameter. For the generation of hyperchaotic oscillator, an external capacitor is added to the third order chaotic oscillator. To justify the theoretical nonlinear dynamics of proposed chaotic oscillator, PSPICE simulation by using CMOS based OTRA and experimental investigation using IC AD844 based OTRA are well implemented.
21 citations
TL;DR: A low-power fully on-chip tunable amplitude and frequency waveform generator (WFG) is proposed, designed and fabricated in the United Microelectronics Corporation 180-nm CMOS process technology with a 1.8-V supply.
Abstract: In this article, a low-power fully on-chip tunable amplitude and frequency waveform generator (WFG) is proposed. In the proposed architecture, frequency and amplitude are tuned by varying the currents in the respective branches. The waveform generator is designed and fabricated in the United Microelectronics Corporation (UMC) 180-nm CMOS process technology with a 1.8-V supply. It generates a square wave of 50% duty cycle, and the output is symmetric with respect to the common-mode voltage. The measured results show tuning of amplitude from 500 mVpp to 1.15 Vpp and frequency from 50 to 650 kHz approximately. It consumes $620~\mu \text {W}$ of power while occupying 0.03-mm2 silicon area only, making it suitable for low-power integrated system applications.
7 citations
TL;DR: The experimental results show that the performance of the proposed generator is good at operating frequency as low as at 19.8 Hz and as high as 19.2 kHz, and the maximum nonlinearity of oscillation frequency is found to be 4% only.
Abstract: This paper deals with the experimental realization of square/triangular wave generator using commercially available ICs. A prototype of extra-X second generation current conveyor and five passive c...
3 citations
Journal Article•
TL;DR: In this paper, the authors presented three pulsewidth modulation modulators using CMOS operational transconductance amplifiers, which consist of a ramp integrator and current-tunable Schmitt triggers.
Abstract: This paper presents three pulsewidth modulation modulators using CMOS operational transconductance amplifiers. They consist of a ramp integrator and current-tunable Schmitt triggers. Prototype circuits built using discrete components exhibited that their duty cycles are linearly controllable. Because of their simple structure, the proposed modulators can be easily fabricated in a monolithic integrated circuit.
2 citations
24 Jun 2020
TL;DR: The realization of two-inputs three-outputs voltage-mode filter using VD-DIBAs is presented and the Pspice simulation results justify the good functionality of the filtering performance.
Abstract: The voltage differencing differential input buffered amplifier (VD-DIBA) is interesting active building block for voltage-mode (VM) circuit design due to its advantage features such as electronic tuning, high impedance at input voltage ports and low impedance at output voltage port etc. In this paper, the realization of two-inputs three-outputs voltage-mode filter using VD-DIBAs is presented in this paper. The filter employs two VD-DIBAs, two resistors and two capacitors connected to ground. Four filtering responses, band-pass (BP) VM function, highpass (HP) VM function, low-pass (LP) VM function, and band-reject (BR) VM function are obtained. Two input nodes for applying input voltage signal are high impedance. The presented biquad filter employs two active devices but the quality factor (Q) is tuned without disturbing the natural frequency (ω 0 ). Also, the natural frequency tuning is linearly and electronically done through bias current. The proposed filter is designed and simulated using VD-DIBA constructed from commercially available ICs, LM3700 and AD830. The Pspice simulation results justify the good functionality of the filtering performance.
2 citations
Cites background from "Self generating square/triangular w..."
...Especially, the analog filters based electronically tunable active building blocks such as OTA [6-8], CCCII [9-11], VDTA [12-14], CCCDTA [15-17] etc....
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References
More filters
01 Jan 1993
TL;DR: This book discusses current-mode Circuits from a Translinear Viewpoint, as well as applications of current-copier circuits, and the future of Analogue Integrated Circuit Design.
Abstract: * Chapter 1: Introduction * Chapter 2: Current-mode Circuits From A Translinear Viewpoint: A Tutorial * Chapter 3: Current Conveyor Theory And Practice * Chapter 4: Universal Current-Mode Analogue Amplifiers * Chapter 5: High Frequency CMOS Transconductors * Chapter 6: Bipolar Current Mirrors * Chapter 7: Dynamic Current Mirrors * Chapter 8: Gallium Arsenide Analogue Integrated Circuit Design Techniques * Chapter 9: Continuous-Time Filters * Chapter 10: Continuous-time and Switched Capacitor Monolithic Filters Based on LCR Filter Simulation using Current and Charge Variables * Chapter 11: Switched-Current Filters * Chapter 12: Analog Interface Circuits For VLSI * Chapter 13: Current Mode A/D and D/A Converters * Chapter 14: Applications of current-copier circuits * Chapter 15: Integrated Current Conveyor * Chapter 16: Applying 'Current Feedback' to Voltage Amplifiers * Chapter 17: Neural Network Building Blocks for Analog MOS VLSI * Chapter 18: Future of Analogue Integrated Circuit Design
1,382 citations
Book•
01 Jan 1988TL;DR: In this article, the authors present a design-oriented course for operational amplifiers and analog ICs, which includes additional problems, more in-depth coverage of negative feedback, more effective layout, updated technology (current feedback and folded-cascode amplifiers, and low-voltage amplifiers), and increased topical coverage (current-feedback amplifier, switching regulators and phase-locked loops).
Abstract: Franco's "Design with Operational Amplifiers and Analog Integrated Circuits, 3e" is intended for a design-oriented course in applications with operational amplifiers and analog ICs. It also serves as a comprehensive reference for practicing engineers.
This new edition includes enhanced pedagogy (additional problems, more in-depth coverage of negative feedback, more effective layout), updated technology (current-feedback and folded-cascode amplifiers, and low-voltage amplifiers), and increased topical coverage (current-feedback amplifiers, switching regulators and phase-locked loops).
Table of contents
1 Operational Amplifier Fundamentals
2 Circuits with Resistive Feedback
3 Active Filters: Part I
4 Active Filters: Part II
5 Static Op Amp Limitations
6 Dynamic Op Amp Limitations
7 Noise
8 Stability
9 Nonlinear Circuits
10 Signal Generators
11 Voltage References and Regulators
12 D-A and A-D Converters
13 Nonlinear Amplifiers and Phase-Locked Loops
696 citations
TL;DR: In this article, three discontinuous operating modes of PWM (pulsewidth modulated) converters are considered: the discontinuous inductor current mode (DICM), discontinuous capacitor voltage mode (DCVM), and a previously unidentified mode called discontinuous quasi-resonant mode.
Abstract: Three discontinuous operating modes of PWM (pulsewidth modulated) converters are considered: the discontinuous inductor current mode (DICM), the discontinuous capacitor voltage mode (DCVM), and a previously unidentified mode called the discontinuous quasi-resonant mode (DQRM). DC and small-signal AC analyses are applicable to all basic PWM converter topologies. Any particular topology is taken into account via its DC conversion ratio in the continuous conduction mode. The small-signal model is of the same order as the state-space averaged model for the continuous mode, and it offers improved predictions of the low-frequency dynamics of PWM converters in the discontinuous modes. It is shown that converters in discontinuous modes exhibit lossless damping similar to the effect of the current-mode programming. >
219 citations
TL;DR: A triangular/square-wave generator with current-controllable frequency and amplitude and the application of the circuit to a current- Controllable saw-tooth waveform generator is presented.
Abstract: A triangular/square-wave generator with current-controllable frequency and amplitude is presented. The generator utilizes operational transconductance amplifiers as switching elements. A prototype circuit built with commercially available components exhibits less than 2% nonlinearity in its current-to-frequency transfer characteristic from 1 to 10 kHz and -150 ppm//spl deg/C temperature coefficient of frequency over 15/spl deg/C to 35/spl deg/C. The circuit also displays wide sweep capability and good linearity of current to amplitude. The application of the circuit to a current-controllable saw-tooth waveform generator is also presented.
98 citations
TL;DR: Two second-generation current conveyor (CCII+)-based resistance-capacitance (RC) square/triangular waveform generators, which have been derived from their voltage-mode op-amp-based schemes, with independent control of frequency are presented.
Abstract: Two second-generation current conveyor (CCII+)-based resistance-capacitance (RC) square/triangular waveform generators, which have been derived from their voltage-mode op-amp-based schemes, with independent control of frequency are presented in this paper. Each configuration consists of two positive second-generation conveyors (CCII(+)-ldquoArdquo and CCII(+)-ldquoBrdquo), three resistors, and one floating capacitor that is responsible for better linearity. The frequency of the waveform generators can independently be adjusted with any passive device. The circuits were built with commercially available current feedback operational amplifiers (AD844) and passive components used externally and tested for waveform generation and tunability. The measured results included in the paper show excellent linear variation of frequency as compared with existing reported configurations over the range from 25 Hz to 260 kHz. The configurations that are suitable for very large scale integration (VLSI) realization find application in capacitive and resistive sensors and in neuro-fuzzy systems.
95 citations