New voltage-mode universal filter and sinusoidal oscillator using only single DBTA

New voltage-mode universal filter and sinusoidal oscillator using only single DBTA

WoS Article

In this article, a new voltage-mode second-order universal frequency filter and sinusoidal oscillator using only single differential-input buffered and transconductance amplifier (DBTA) is presented. The proposed voltage-mode filter structure using single DBTA and four passive elements can provide all standard filter functions, i.e. low-, band-, high-pass, band-stop, and all-pass without changing the circuit topology and enables independent control of the quality factor Q using single passive element. The circuit requires the minimal number of active and passive elements with no conditions for component matching. By slight modification of the proposed filter structure, the new DBTA-based sinusoidal oscillator is easily obtained. The oscillation condition and the oscillation frequency are independently adjustable by different virtually grounded passive elements. The proposed sinusoidal oscillator employs only grounded capacitors. The passive and active sensitivities of all the proposed circuit configurations are low. PSPICE simulations using a BJT realisation of DBTA and experimental results based on commercially available amplifiers OPA860 and MAX436 are included, which prove the workability of the proposed circuits.

In this article, a new voltage-mode second-order universal frequency filter and sinusoidal oscillator using only single differential-input buffered and transconductance amplifier (DBTA) is presented. The proposed voltage-mode filter structure using single DBTA and four passive elements can provide all standard filter functions, i.e. low-, band-, high-pass, band-stop, and all-pass without changing the circuit topology and enables independent control of the quality factor Q using single passive element. The circuit requires the minimal number of active and passive elements with no conditions for component matching. By slight modification of the proposed filter structure, the new DBTA-based sinusoidal oscillator is easily obtained. The oscillation condition and the oscillation frequency are independently adjustable by different virtually grounded passive elements. The proposed sinusoidal oscillator employs only grounded capacitors. The passive and active sensitivities of all the proposed circuit configurations are low. PSPICE simulations using a BJT realisation of DBTA and experimental results based on commercially available amplifiers OPA860 and MAX436 are included, which prove the workability of the proposed circuits.

active filter; analogue signal processing; universal frequency filter; differential-input buffered and transconductance amplifier (DBTA); voltage-mode; sinusoidal oscillator

active filter; analogue signal processing; universal frequency filter; differential-input buffered and transconductance amplifier (DBTA); voltage-mode; sinusoidal oscillator

HERENCSÁR, N.; KOTON, J.; VRBA, K.; LATTENBERG, I.

2011

01.04.2010

Taylor & Francis

0020-7217

INTERNATIONAL JOURNAL OF ELECTRONICS

97

4

United Kingdom of Great Britain and Northern Ireland

365

379

15

http://www.tandfonline.com/doi/abs/10.1080/00207210903325229

http://hdl.handle.net/11012/69951