Electronically tunable active filters with operational transconductance amplifiers

1982 ◽  
Vol 29 (5) ◽  
pp. 333-336 ◽  
Author(s):  
H. Malvar
Keyword(s):  
Active Filters ◽  
Operational Transconductance Amplifiers ◽  
Transconductance Amplifiers ◽  
Electronically Tunable

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.

Electronically Tunable Memcapacitor Emulator Based on Operational Transconductance Amplifiers

2020 ◽  
pp. 2150082 ◽  
Author(s):  
Mustafa Konal ◽  
Firat Kacar
Keyword(s):  
Input Signal ◽  
Science And Technology ◽  
Cmos Process ◽  
Analog Multiplier ◽  
Operational Transconductance Amplifiers ◽  
Memory Circuit ◽  
Transconductance Amplifiers ◽  
Simulation Results ◽  
Circuit Elements ◽  
Electronically Tunable

Memory circuit elements are of interest due to their use in different fields of science and technology. In this research, a new multi-outputs operational transconductance amplifiers (MO-OTA)-based memcapacitor emulator is proposed. The proposed emulator employs two OTAs, two capacitors, two resistors and an analog multiplier. The memcapacitor emulator circuit has electronically tunability property. Charge value of the memcapacitor can be adjusted by changing the transconductance [Formula: see text] value with the biasing current of the MO-OTA or frequency value of the input signal. In order to analyze the performance of the proposed circuit, memcapacitor emulator is simulated in 0.18[Formula: see text][Formula: see text]m TSMC CMOS process using LTSPICE and the simulation results are demonstrated.

scholarly journals New Temperature-Insensitive Electronically-Tunable Grounded Capacitor Simulator

1996 ◽  
Vol 19 (1) ◽  
pp. 55-58
Author(s):  
Muhammad Taher Abuelma'atti ◽  
Muhammad Haroon Khan
Keyword(s):  
Experimental Results ◽  
Operational Transconductance Amplifiers ◽  
Transconductance Amplifiers ◽  
Electronically Tunable

A new circuit for simulating a grounded capacitor is presented. The circuit uses one operationalamplifier (OA), three operational-transconductance amplifiers (OTAs), and one capacitor. The realized capacitor is temperature-insensitive and electronically tunable. Experimental results are included.

scholarly journals New Electronically-Tunable Oscillator Circuit Using Only Two OTAs

1998 ◽  
Vol 20 (4) ◽  
pp. 189-194 ◽  
Author(s):  
Muhammad Taher Abuelma'atti ◽  
Muhammad Haroon Khan
Keyword(s):  
Experimental Results ◽  
Independent Control ◽  
Oscillator Circuit ◽  
Operational Transconductance Amplifiers ◽  
Condition Of Oscillation ◽  
Transconductance Amplifiers ◽  
Electronically Tunable ◽  
Tunable Oscillator

New oscillator circuit using two operational transconductance amplifiers and grounded capacitors is presented. The oscillator circuit enjoys independent control of the frequency and the condition of oscillation. Experimental results confirming the presented theory are included.

New Resistorless Third-Order Quadrature Sinusoidal Oscillators

2021 ◽  
pp. 2150194
Author(s):  
D. R. Bhaskar ◽  
Ajishek Raj ◽  
Pragati Kumar
Keyword(s):  
Oscillation Frequency ◽  
Frequency Stability ◽  
Good Frequency ◽  
Third Order ◽  
Operational Transconductance Amplifiers ◽  
Sinusoidal Oscillators ◽  
Sustained Oscillations ◽  
Oscillation Condition ◽  
Transconductance Amplifiers ◽  
Electronically Tunable

This paper introduces four new resistorless, third-order, electronically tunable, quadrature sinusoidal oscillators using three operational transconductance amplifiers (OTAs) and three capacitors. The proposed third-order quadrature sinusoidal oscillators (TOQSOs) provide noninteracting control of the oscillation condition (OC) and oscillation frequency (OF) by changing the transconductance of different OTAs, to produce sustained oscillations and offer quadrature output voltages and currents. Two of the proposed quadrature oscillator circuits have capacitor control of OF, a feature, useful in capacitive transducers. The presented TOQSO structures have good frequency stability and exhibit low active and passive sensitivities. PSPICE simulations using CMOS OTAs along with hardware results (using off-the-shelf available OTA IC LM13700) have also been provided to confirm the workability of the presented circuits.

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