Electronically Tunable Single-Input Five-Output Voltage-Mode Universal Filter Using VDTAs and Grounded Passive Elements
- PDF / 593,049 Bytes
- 13 Pages / 439.37 x 666.142 pts Page_size
- 15 Downloads / 178 Views
Electronically Tunable Single-Input Five-Output Voltage-Mode Universal Filter Using VDTAs and Grounded Passive Elements Jetsdaporn Satansup · Tattaya Pukkalanun · Worapong Tangsrirat
Received: 2 February 2012 / Revised: 2 September 2012 / Published online: 22 September 2012 © Springer Science+Business Media, LLC 2012
Abstract This paper presents a possible usage of the voltage differencing transconductance amplifier (VDTA) for the design of an electronically tunable single-input five-output voltage-mode universal filter. The presented filter is constructed using two VDTAs, two capacitors and two resistors that are all grounded. The circuit simultaneously realizes lowpass (LP), bandpass (BP), highpass (HP), bandstop (BS) and allpass (AP) filtering responses, without changing the circuit topology. The circuit is capable of providing an independent electronic control of the natural angular frequency (ω0 ) and the quality factor (Q) through the transconductance gains of the VDTAs. By simply adjusting the transconductance ratio, a high-Q filter can also be obtained. Because of the high-input impedance of the circuit, it is advantageous for cascade connection. To support the theoretical analysis, the properties of the designed filter have been verified by PSPICE simulation results. Keywords Voltage differencing transconductance amplifier (VDTA) · Universal filter · Voltage-mode circuit 1 Introduction In the last decade, progress in the microelectronic area presents new circuit principles of active building blocks for fast analog signal processing and improving the properties of existing ones, such as operational transconductance amplifier (OTA) or current J. Satansup · T. Pukkalanun · W. Tangsrirat () Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang (KMITL), Bangkok 10520, Thailand e-mail: [email protected] J. Satansup e-mail: [email protected] T. Pukkalanun e-mail: [email protected]
946
Circuits Syst Signal Process (2013) 32:945–957
conveyor (CC) [4]. Some new analog active building blocks providing the potentiality in analog circuit design were and are being introduced, such as current differencing transconductance amplifier (CDTA) [3], current conveyor transconductance amplifier (CCTA) [24], differential difference current conveyor transconductance amplifier (DDCCTA) [23], and so on [4]. Among these, the voltage differencing transconductance amplifier (VDTA) is a recently introduced active element. This element can be compared with the previously introduced CDTA element, in which the current differencing unit at the front-end is replaced by the voltage differencer. This means that the VDTA is composed of the current source controlled by the difference of two input voltages and a multiple-output transconductance amplifier, providing electronic tuning ability through its transconductance gains. Therefore, the VDTA device is very suitable for electronically tunable active circuit synthesis. Another advantageous feature of the use of the VDTA as an active element is that compact str
Data Loading...
