Recent Developments in Current-Mode Sinusoidal Oscillators: Circuits and Active Elements

Abuelma’atti, Muhammad Taher

doi:10.1007/s13369-016-2325-x

Cited by 10 publications

(3 citation statements)

References 148 publications

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“…Sensitivities of proposed solution achieved the standard and low value of −0.5. A possibility of the implementation of the both resistors for tuning purposes and their replacement by suitable electronically controllable equivalents (optocouplers with resistive outputs stage) can be seen as inspiration for many interesting topologies of oscillators (a great overview is available in References [45,46]), where the presented method of tuning can be beneficially implemented. …”

Section: Discussionmentioning

confidence: 99%

Design and Analysis of CCII-Based Oscillator with Amplitude Stabilization Employing Optocouplers for Linear Voltage Control of the Output Frequency

et al. 2018

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This paper shows the topology design of a simple second-order oscillator based on two three-port current conveyors, two resistors, and two grounded capacitors, as well as its modification to a voltage-controlled oscillator (VCO). In comparison with many previous works, the following useful conceptual novelties and improvements were made in this study. Both resistors presented in the topology can be employed to tune of the oscillation frequency by the simultaneous driving of two optocouplers with resistive output stage. The current gain of the current conveyor ensures the control of the oscillation condition. The proposed solution offers advantages (in comparison with many standard so-called single-resistance-controllable types) of improved dependence of the frequency of oscillation (FO) on a driving force (extended tuning of the FO), constant ratio of amplitudes of generated waveforms when the FO is tuned, low complexity (taking into account auxiliary circuitry for optocouplers), and comfortable tuning of the FO by a single control voltage. The oscillator produces waveforms with tunable frequency having a constant 45-degree phase shift between them. The relative sensitivities of the proposed solution achieve typical values for these second-order systems (−0.5). Experimental verification confirmed the expected behavior in the operational band between 1 and 10 MHz tuned by a DC voltage from 1.7 to 5 V. This indicates a significant reduction of the driving force ratio (3:1 in our case) in comparison with standard tuning approaches required for a ratio of 10:1 for FO adjustment. Output amplitudes reached 100 and 150 mV in the observed tunability range with distortion ranging between 0.7 and 3.3%.

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Section: Discussionmentioning

confidence: 99%

Design and Analysis of CCII-Based Oscillator with Amplitude Stabilization Employing Optocouplers for Linear Voltage Control of the Output Frequency

et al. 2018

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“…Various oscillator circuits are provided in the literature with OTA as the leading block having grounded capacitor feature. It is found to be suitable for monolithic IC technology and thin film fabrication as it is less sensitive to parasitics and noise [11], [12]. Of these A. Srinivasulu et al in [13] presented a nearly similar topology as proposed by these authors here although their transfer function had a lower-valued constant term resulting in lower centrefrequency.…”

Section: Introductionmentioning

confidence: 86%

An Operational Transconductance Amplifiers Based Sinusoidal Oscillator Using CNTFETs

Bhargav

Srinivasulu

Pal

2018

2018 International Conference on Applied Electronics (AE)

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1 Abstract-A new sinusoidal oscillator using Carbon Nanotube Field Effect Transistors (CNTFET) based Operational Transconductance Amplifiers (CNOTA) with grounded capacitors is presented in this paper. The proposed current-mode oscillator thus implemented and having grounded capacitor feature, fulfils the need for realizations of systems used in combination with various other systems/ subsystems -both voltage-mode and current mode. It also ensures simplicity in implementation by using a single-ended CNOTA. The analytical model is given for the circuit leading to fulfilment of the condition of oscillation at tuned frequency. The proposed sinusoidal oscillator is primarily used in the field of signal dispensation applications, telecommunication networks, communication-equipment and control modules. The benefits derived from the introduced model are validated by simulation carried out at a supply voltage of ±1.8 V in Cadence virtuoso using spectre model libraries. They are further tested with the aid of 32 nm model of Carbon Nanotube Field Effect Transistor (CNTFET) technology obtained through open source. The proposed design (and the model provided) is found to be in good agreement with the obtained results.

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“…Among various types of medical instrumentation and read-out circuits for biosignals, current-mode integrated circuits have recently gained considerable attention due to their numerous benefits, such as large bandwidth, wide dynamic range, high linearity, low power consumption, and simple circuitry. Therefore, various types of current conveyors are the most widely used current-mode active building blocks [9][10][11][12][13][14]. The second-generation current conveyor (CCII), one of the most versatile current mode building blocks, was introduced by Sedra and Smith in 1970 [15].…”

Section: Introductionmentioning

confidence: 99%

A Band-Pass Instrumentation Amplifier Based on a Differential Voltage Current Conveyor for Biomedical Signal Recording Applications

2022

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Recently, due to their abundant benefits, current-mode instrumentation amplifiers have received considerable attention in medical instrumentation and read-out circuit for biosensors. This paper is focused on the design of current-mode instrumentation amplifiers for portable, implantable, and wearable electrocardiography and electroencephalography applications. To this end, a CMOS differential voltage second-generation current conveyor (DVCCII) based on a linear transconductor is presented. A new band-pass instrumentation amplifier, based on the designed DVCCII, is also implemented in this paper. The concept of the proposed differential voltage current conveyor and instrumentation amplifier is validated numerically and their predicted performance is presented. The simulation results of the presented circuits were tested for 0.18 μm TSMC CMOS technology in a post layout simulation level using the Cadence Virtuoso tool with a ±0.9 V power supply, and demonstrated that the designed DVCCII has a wide dynamic range of ±400 mV and ±0.85 mA and a power consumption of 148 μW. The layout of the DVCCII circuit occupies a total area of 0.378 μm2. It is shown that the designed DVCCII benefits from good linearity over a wide range of input signals and provides a low input impedance at terminal X. Two versions of the proposed band-pass instrumentation amplifier using pseudo resistances were designed with different specifications for two different applications, namely for EEG and ECG signals. Numerical analyses of both designs show proper outputs and frequency responses by eliminating the undesired artifact and DC component of the EEG and ECG input signals.

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Recent Developments in Current-Mode Sinusoidal Oscillators: Circuits and Active Elements

Cited by 10 publications

References 148 publications

Design and Analysis of CCII-Based Oscillator with Amplitude Stabilization Employing Optocouplers for Linear Voltage Control of the Output Frequency

Design and Analysis of CCII-Based Oscillator with Amplitude Stabilization Employing Optocouplers for Linear Voltage Control of the Output Frequency

An Operational Transconductance Amplifiers Based Sinusoidal Oscillator Using CNTFETs

A Band-Pass Instrumentation Amplifier Based on a Differential Voltage Current Conveyor for Biomedical Signal Recording Applications

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