Current-mode multiphase sinusoidal oscillator using CCCCTAS and grounded elements

This research article explores the possible applications of voltage differencing current conveyor (VDCC), as a current mode universal filter and a sinusoidal oscillator. Without the need for an additional active/passive element, a very simple hardware modification makes it a dual-mode quadrature oscillator from the filter configuration. Both the proposed circuit requires only two VDCC and all grounded passive elements, hence a preferable choice for integration. The filter has some desirable features such as availability of all five explicit outputs, independent tunability of filter parameters. Availability of explicit quadrature current outputs, independence in start and frequency of oscillations, makes it a better oscillator design. Apart from prevalent CMOS simulation results, VDCC is also realized and experimentally tested using the off-the-shelf integrated circuit. All the pen and paper analysis such as non-ideal, sensitivity and parasitic analysis supports the design.

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Comment: Multifunction Current Differencing Cascaded Transconductance Amplifier (MCDTA) and Its Application to Current-Mode Multiphase Sinusoidal Oscillator

Wireless Personal Communications ◽

10.1007/s11277-018-5635-3 ◽

2018 ◽

Vol 100 (4) ◽

pp. 1295-1297

Author(s):

Shireesh Kumar Rai ◽

Maneesha Gupta

Keyword(s):

Current Mode ◽

Transconductance Amplifier ◽

Sinusoidal Oscillator

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An Active-C Current-Mode Universal First-Order Filter and Oscillator

Journal of Circuits System and Computers ◽

10.1142/s0218126619502190 ◽

2019 ◽

Vol 28 (13) ◽

pp. 1950219 ◽

Cited By ~ 5

Author(s):

D. Agrawal ◽

S. Maheshwari

Keyword(s):

Transfer Functions ◽

Current Mode ◽

Cmos Technology ◽

Monte Carlo Analysis ◽

Passive Element ◽

First Order ◽

Order Filter ◽

Sinusoidal Oscillator ◽

High Output Impedance ◽

Electronically Tunable

This paper presents an electronically tunable current-mode first-order universal filter. The proposed circuit employs only a single Extra-X Current-Controlled Conveyor (EX-CCCII) and a single grounded capacitor, which is suitable for IC implementation. The circuit can realize three current transfer functions simultaneously, namely low-pass, high-pass and all-pass. The proposed circuit exhibits low-input and high-output impedance, which is suitable for cascading. The pole frequency of the filter can be electronically tuned, by varying the bias current of EX-CCCII. The nonidealities and parasitic effects on the circuit performance are investigated in detail. Also, the Monte Carlo analysis is done to show the effect of active and passive element mismatches on the pole frequency. An eight-phase current-mode sinusoidal oscillator and current-mode second-order filter are further realized using the proposed circuit. The functionality of the proposed circuits is verified through PSPICE simulations, using 0.25-[Formula: see text]m TSMC CMOS technology parameters.

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