Resistorless realization of current-mode first-order allpass filter using current differencing transconductance amplifiers

Tangsrirat, Worapong; Pukkalanun, Tattaya; Surakampontorn, W.

doi:10.1016/j.mejo.2010.02.001

Cited by 56 publications

(28 citation statements)

References 19 publications

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“…Recently, a voltage tunable CDTA with high performance and enhanced bandwidth has been proposed in [13]. Apart from the advancement in the structure of CDTA, there are a lot of papers published in the applications such as current limiter [14], filters [15][16][17][18][19], inductance simulation circuits [20], multipliers [21,22], modulators [23], oscillators [24][25][26][27][28][29][30][31], rectifier [32,33] etc. Among the applications cited above, the center frequency (f 0 ) of filters and frequency of oscillation (f 0 ) of oscillators are controlled by the ratio of transconductance (g m ) to capacitor (C) i.e.…”

Section: Introductionmentioning

confidence: 99%

Current differencing transconductance amplifier (CDTA) with high transconductance and its application in filter and oscillator

Kumar

Gupta

2016

Optik

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Section: Introductionmentioning

confidence: 99%

Current differencing transconductance amplifier (CDTA) with high transconductance and its application in filter and oscillator

Kumar

Gupta

2016

Optik

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“…CDTA is a recently reported current mode active block with a current differencing circuit and a transconductance circuit, and CDTA is widely used in current-mode filters [25][26][27], sinusoidal oscillators [28][29][30] and inductance simulator circuit [31]. Unlike previously reported current mode blocks, the most important characteristic of CDTA is that the two input ports (p and n) of the CDTA are virtually grounded, and the parasitics of the input ports are relatively smaller than the other current mode blocks, and the bandwidth of CDTA is relatively wider than the other current mode blocks.…”

Section: Introductionmentioning

confidence: 99%

A wideband linear tunable CDTA and its application in field programmable analogue array

Wang

Sun

et al. 2016

Analog Integr Circ Sig Process

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This document is the Accepted Manuscript version of the following article: Hu, Z., Wang, C., Sun, J. et al. ???A wideband linear tunable CDTA and its application in field programmable analogue array???, Analog Integrated Circuits and Signal Processing, Vol. 88 (3): 465-483, September 2016. Under embargo. Embargo end date: 6 June 2017. The final publication is available at Springer via https://link.springer.com/article/10.1007%2Fs10470-016-0772-7 ?? Springer Science+Business Media New York 2016In this paper, a NMOS-based wideband low power and linear tunable transconductance current differencing transconductance amplifier (CDTA) is presented. Based on the NMOS CDTA, a novel simple and easily reconfigurable configurable analogue block (CAB) is designed. Moreover, using the novel CAB, a simple and versatile butterfly-shaped FPAA structure is introduced. The FPAA consists of six identical CABs, and it could realize six order current-mode low pass filter, second order current-mode universal filter, current-mode quadrature oscillator, current-mode multi-phase oscillator and current-mode multiplier for analog signal processing. The Cadence IC Design Tools 5.1.41 post-layout simulation and measurement results are included to confirm the theory

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“…Especially, the four-phases quadrature oscillators are suitable for the sub-harmonic mixer to reduce the noise and inter-modulation distortion [7][8]; and the multi-phases oscillators can be used in sub-harmonically pumped frequency conversion circuits [9].The mostly reported works are two integrator loop second-order quadrature oscillators and all-pass filter-based second-order quadrature oscillators [10][11][12][13][14][15][16][17][18][19][20][21], however, the CO and FO of the third-order quadrature oscillators usually can be controlled electronically and independently, they are more suitable for variable frequency oscillator, and they are more suitable for practice use [22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Novel Third-Order Quadrature Oscillators with Grounded Capacitors

Wang

Sun

2015

Automatika

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Original scientific paperThis paper presents two Current Differencing Transconductance Amplifiers (CDTA)-based current-mode resistors-less variable frequency third-order Quadrature Oscillators (TOQO). The proposed TOQOs consist of minimum number of active and passive components, especially the first TOQO, only two CDTAs and three capacitors are used in it. The two TOQOs are completely resistor-less, and the capacitors used in the TOQOs are all grounded, which are ideal for monolithic integration. The condition of oscillation (CO) and frequency of oscillation (FO) of the TOQOs can be controlled electronically and independently, which make them suitable for variable frequency oscillator (VFO). Moreover, the two TOQOs can provide four explicit quadrature current outputs at high output impedance terminals, and they can be directly cascaded with other current-mode circuits without any impedance matching requirements. Cadence IC Design Tools 5.1.41 post-layout simulation results and experimental evidence are included to confirm all the theory.Key words: Third-order quadrature oscillator, Cadence IC Design Tools, LayoutNovi kvadraturni oscilator trećeg reda s uzemljenim kondenzatorima. U ovom radu prikazana su dva kvadratična oscilatora trećeg reda (TOQO) zasnovana na strminskim pojačalima diferenciranja struja (CDTA), korištena u strujnom režimu bez otpornika uz promjenjivu frekvenciju. Predloženi TOQO-ovi sastoje se od najmanjeg mogućeg broja aktivnih i pasivnih komponenti, osobito prva inačica TOQO-a, u kojoj su korištena samo dva CDTAa i tri kondenzatora. TOQO-ovi ne posjeduju niti jedan otpornik, dok su svi kondenzatori korišteni u TOQO-ovima uzemljeni, što je idealno za monolitnu integraciju. Uvjet osciliranja (CO) i frekvencija osciliranja (FO) TOQO-ova može biti upravljana elektronički i nezavisno, što ihčini pogodnima za oscilatore promjenjive frekvencije (VFO). Nadalje, dva TOQO-a mogu isporučivatičetiri eksplicitna kvadratična strujna izlaza na priključku visoke izlazne impedancije, te mogu biti u direktnoj kaskadi s drugim krugovima u strujnom režimu bez ikakvih zahtjeva na poklapanje impedancija. Simulacijski rezultati za prikazane sheme dobiveni su korištenjem Cadence IC Design Tools 5.1.41 alata, a uključeni su i eksperimentalni pokazatelji kako bi se potvrdila sva prikazana teorijska osnova.

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Resistorless realization of current-mode first-order allpass filter using current differencing transconductance amplifiers

Cited by 56 publications

References 19 publications

Current differencing transconductance amplifier (CDTA) with high transconductance and its application in filter and oscillator

Current differencing transconductance amplifier (CDTA) with high transconductance and its application in filter and oscillator

A wideband linear tunable CDTA and its application in field programmable analogue array

Novel Third-Order Quadrature Oscillators with Grounded Capacitors

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