Voltage-Tunable Immittance Functions: Linear Voltage-Controlled Quadrature Oscillator Implementation

2022 ◽  
Author(s):  
K. Mathur ◽  
R. Nandi
Keyword(s):  
Quadrature Oscillator ◽  
Linear Voltage

A Linear VCO Using Single CFA and Analog Multipliers: Quadrature Oscillator Implementation

2021 ◽  
Author(s):  
K. Mathur ◽  
P. Venkateswaran ◽  
R. Nandi
Keyword(s):  
Noise Figure ◽  
Short Circuit ◽  
Open Loop ◽  
Control Voltage ◽  
Voltage Controlled Oscillator ◽  
Quadrature Oscillator ◽  
Loop Transfer Function ◽  
Band Pass ◽  
Linearity Error ◽  
Linear Voltage

A new linear voltage-controlled oscillator (LVCO) implementation using single AD-844 CFA with a pair of AD-835 multiplier devices and a pair of grounded capacitors is proposed. The open-loop transfer function of the topology is analyzed wherein the concept of Short-Circuit Natural Frequency (SCNF) is applied to derive the sinusoid oscillator implementation. The proposed oscillator circuit is then restructured to yield a linear voltage-controlled quadrature oscillator (LVCQO) after appropriate cascade with a CFA-based active integrator. The oscillation frequency is linearly tunable ([Formula: see text][Formula: see text]MHz) by the multiplier control voltage ([Formula: see text]. Subsequently, a high-[Formula: see text] selective band-pass (BP) filter is derived. Effects of the CFA port roll-off parameters and its parasitic capacitors ([Formula: see text] had been analyzed to be negligible. Measured oscillator response exhibited a THD [Formula: see text]%, a linearity error ([Formula: see text]% and a phase noise figure of ([Formula: see text]104 dBc/Hz at 24-kHz offset.

scholarly journals Voltage-variable inductor based linear voltage controlled quadrature oscillator implementation

2020 ◽  
Vol 17 (5) ◽  
pp. 20190738-20190738
Author(s):  
Koushick Mathur ◽  
Palaniandavar Venkateswaran ◽  
Rabindranath Nandi
Keyword(s):  
Quadrature Oscillator ◽  
Variable Inductor ◽  
Linear Voltage

scholarly journals All-Pass Filter Based Linear Voltage Controlled Quadrature Oscillator

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Koushick Mathur ◽  
Palaniandavar Venkateswaran ◽  
Rabindranath Nandi
Keyword(s):  
Current Feedback ◽  
Pass Filter ◽  
Quadrature Oscillator ◽  
First Order ◽  
Feedback Amplifier ◽  
Current Feedback Amplifier ◽  
Control Node ◽  
Node Voltage ◽  
Electronically Tunable ◽  
Linear Voltage

A linear voltage controlled quadrature oscillator implemented from a first-order electronically tunable all-pass filter (ETAF) is presented. The active element is commercially available current feedback amplifier (AD844) in conjunction with the relatively new Multiplication Mode Current Conveyor (MMCC) device. Electronic tunability is obtained by the control node voltage (V) of the MMCC. Effects of the device nonidealities, namely, the parasitic capacitors and the roll-off poles of the port-transfer ratios of the device, are shown to be negligible, even though the usable high-frequency ranges are constrained by these imperfections. Subsequently the filter is looped with an electronically tunable integrator (ETI) to implement the quadrature oscillator (QO). Experimental responses on the voltage tunable phase of the filter and the linear-tuning law of the quadrature oscillator up to 9.9 MHz at low THD are verified by simulation and hardware tests.

BEHAVIORAL MODEL OF A LINEAR VOLTAGE STABILIZER IN THE SPICE LANGUAGE

2019 ◽  
Author(s):  
Aleksey Malahanov
Keyword(s):  
Experimental Data ◽  
Behavioral Model ◽  
Voltage Stabilizer ◽  
Static Mode ◽  
Technical Description ◽  
Simulation Results ◽  
Chip Manufacturer ◽  
Linear Voltage

A variant of the implementation of the behavioral model of a linear voltage stabilizer in the Spice language is presented. The results of modeling in static mode are presented. The simulation results are compared with experimental data and technical description of the chip manufacturer.

Third order quadrature oscillator and its application using CDBA

2021 ◽  
Author(s):  
Mourina Ghosh ◽  
Shekhar Suman Borah ◽  
Ankur Singh ◽  
Ashish Ranjan
Keyword(s):  
Third Order ◽  
Quadrature Oscillator

scholarly journals Current-Mode Third-Order Quadrature Oscillator Using CDTAs

2009 ◽  
Vol 2009 ◽  
pp. 1-5 ◽  
Author(s):  
Jiun-Wei Horng
Keyword(s):  
Theoretical Analysis ◽  
Phase Difference ◽  
Oscillation Frequency ◽  
Current Mode ◽  
Third Order ◽  
Quadrature Oscillator ◽  
Oscillation Condition ◽  
Transconductance Amplifiers ◽  
Simulation Results ◽  
A Current

This paper describes a current-mode third-order quadrature oscillator based on current differencing transconductance amplifiers (CDTAs). Outputs of two current-mode sinusoids with90°phase difference are available in the quadrature oscillator circuit. The oscillation condition and oscillation frequency are orthogonal controllable. The proposed circuit employs only grounded capacitors and is ideal for integration. Simulation results are included to confirm the theoretical analysis.

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