A Simple Schmitt Trigger Circuit with Grounded Passive Elements and Its Application to Square/Triangular Wave Generator

In this paper, a versatile modulator circuit that can be used for amplitude modulation, frequency modulation, delta modulation and sigma delta modulation has been proposed. The circuit has been implemented with the help of CDTA blocks, grounded capacitor and resistors. The circuit basically consists of an integrator, a Schmitt trigger and an inherent clock which is used as a carrier signal thereby obviating the need for an external clock. Due to its compact size, it is suitable for IC realisation. The performance comparison of different modulation modes is made in terms of power dissipation, signal to noise ratio (SNR) and output noise voltage.Index Terms--Current difference transconductance amplifier (CDTA), Amplitude Modulation, Frequency Modulation, Delta Modulation, Sigma Delta Modulation.

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“…The current flowing through the capacitor is equal to I Bias3 . Therefore, voltage across the capacitor is given by (3).…”

Section: B Frequency Modulationmentioning

confidence: 99%

Design of versatile modulator using CDTAs

Pandey

Sayal

Tripathi

et al. 2013

2013 International Conference on Emerging Trends in Communication, Control, Signal Processing and Computing Applications (C2SPC

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“…Subsequently, the operation returns to on-duty cycle mode. The decreasing rate of V o2 and the currents I X and I Z in this state are expressed in (14) to (16).…”

Section: Circuit Descriptions and Operationsmentioning

confidence: 99%

“…In 2007 literature [13] presented an operational transresistance amplifier (OTRA) based scheme that featured switch-controllable operation. Recent research reports a DVCC-based topology constructed with two DVCCs and four passive components [16]. This is the first reported square/triangular wave generator built by DVCCs.…”

Section: Introductionmentioning

confidence: 99%

“…For several years, the typical configuration of square/triangular generator was realized by using OPAs combined with external passive components [1]. In addition to OPA-based configuration, previous studies presented several implementations of square/triangular wave generators using different types of active devices [11][12][13][14][15][16]. For the reported square/triangular wave generators, one current tunable topology was designed using three operational transconductance amplifiers (OTAs) [12].…”

Section: Introductionmentioning

confidence: 99%

“…Because the DVCC-based application circuits received considerable attention in recent years, this study proposes a novel circuit configuration to add to this list. Although DVCC-based square/triangular wave generator was discussed in a previous study [16], this paper presents a compact topology to implement a low cost design. To illustrate the novelty and difference of the proposed circuit, comparisons with other schemes are shown in Table 1.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Square/Triangular Wave Generator Using Single DO-DVCC and Three Grounded Passive Components

Chien¹

2013

AJEEE

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This study proposes a novel square/triangular wave generator based on a dual outputs differential voltage current conveyor (DO-DVCC). The proposed circuit uses one DO-DVCC combined with three grounded passive components. The presented scheme reveals a compact topology and can produce square/triangular waveform simultaneously. To verify their feasibility, commercially available ICs were used for implementing the prototype circuits. Experimental results revealed consistency with theoretical analyses.

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A waveform generator circuit for extra low‐frequency CMOS micro‐power applications

Al-Darkazly

Hasan

2015

Circuit Theory & Apps

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Summary This paper presents a novel low‐power CMOS extra low‐frequency (ELF) waveform generator based on an operational trans‐conductance amplifier (OTA). The generator has been designed and fabricated using 2.5‐V devices available in 130‐nm IBM CMOS technology with a ±1.2‐V voltage supply. Using the same topology, two sets of device dimensions and circuit components are designed and fabricated for comparing relative performance, silicon area and power dissipation. The first design consumes 691 μW, while the second design consumes 943 μW using the same voltage supply. This low‐power performance enables the circuit to be used in many micro‐power applications. ELF oscillation is achieved for the two designs being around 3.95 Hz and 3.90 Hz, respectively, with negligible waveform distortion. The measured frequencies agree well with the simulation results. The first design is found to provide overall optimal performance compared to the second design at the expense of higher silicon area. Copyright © 2015 John Wiley & Sons, Ltd.

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A Simple Schmitt Trigger Circuit with Grounded Passive Elements and Its Application to Square/Triangular Wave Generator

Cited by 63 publications

References 31 publications

Design of versatile modulator using CDTAs

Design of versatile modulator using CDTAs

Square/Triangular Wave Generator Using Single DO-DVCC and Three Grounded Passive Components

A waveform generator circuit for extra low‐frequency CMOS micro‐power applications

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