{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,21]],"date-time":"2026-02-21T09:18:14Z","timestamp":1771665494151,"version":"3.50.1"},"reference-count":45,"publisher":"MDPI AG","issue":"16","license":[{"start":{"date-parts":[[2022,8,19]],"date-time":"2022-08-19T00:00:00Z","timestamp":1660867200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>This paper presents four new designs for a first-order voltage-mode (VM) all-pass filter (APF) circuit based on two single-output positive differential voltage current conveyors (DVCCs). The first two proposed VMAPFs with unity-gain, high-input (HI) impedance and low-output (LO) impedance use two DVCCs, a grounded capacitor, and a grounded resistor. The last two proposed first-order VMAPFs with HI impedance and variable-gain control are two resistors added to each of the first two VMAPFs. The last two proposed first-order VMAPFs with variable-gain control use two DVCCs, one grounded capacitor, and three grounded resistors and provide HI impedances, so that VMAPFs can be directly cascaded to obtain high-order filters without additional voltage buffers. The four implementation circuits based only on grounded passive components are particularly applicable for integrated circuits (ICs). To confirm the cascading characteristics, an application example of a fully-uncoupled quadrature sinusoidal oscillator (FQSO) is also proposed. PSpice simulation results have confirmed the feasibility of the proposed structures. VMAPF and FQSO circuits are also constructed from commercial AD8130 and AD844 ICs, and their experimentally measured time and frequency responses are compared to theoretical values. The supply voltages for both the AD8130 and AD844 ICs were \u00b15 V. The measured power dissipation of the proposed first-order VMAPF and second-order FQSO circuits is 0.6 W. The measured input 1-dB compression point for the four VMAPFs is about 19 dB. The measured total harmonic distortion of the four VMAPFs is less than 0.67% when the input voltage reaches 2.5 Vpp. The calculated figures of merit for the four VMAPFs are 628.2 \u00d7 103, 603.06 \u00d7 103, 516.53 \u00d7 103, and 496.42 \u00d7 103, respectively.<\/jats:p>","DOI":"10.3390\/s22166250","type":"journal-article","created":{"date-parts":[[2022,8,22]],"date-time":"2022-08-22T01:56:40Z","timestamp":1661133400000},"page":"6250","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Four Unity\/Variable Gain First-Order Cascaded Voltage-Mode All-Pass Filters and Their Fully Uncoupled Quadrature Sinusoidal Oscillator Applications"],"prefix":"10.3390","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2666-2304","authenticated-orcid":false,"given":"Hua-Pin","family":"Chen","sequence":"first","affiliation":[{"name":"Department of Electronic Engineering, Ming Chi University of Technology, New Taipei 24301, Taiwan"}]},{"given":"San-Fu","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of Electronic Engineering, National Chin-Yi University of Technology, Taichung 41170, Taiwan"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6141-187X","authenticated-orcid":false,"given":"Yitsen","family":"Ku","sequence":"additional","affiliation":[{"name":"Department of Electrical Engineering, California State University Fullerton, Fullerton, CA 92831, USA"}]},{"given":"Yuan-Cheng","family":"Yi","sequence":"additional","affiliation":[{"name":"Department of Electronic Engineering, Ming Chi University of Technology, New Taipei 24301, Taiwan"}]},{"given":"Yi-Fang","family":"Li","sequence":"additional","affiliation":[{"name":"Department of Electronic Engineering, Ming Chi University of Technology, New Taipei 24301, Taiwan"}]},{"given":"Yu-Hsi","family":"Chen","sequence":"additional","affiliation":[{"name":"Department of Electrical Engineering, National Formosa University, Huwei 63201, Taiwan"}]}],"member":"1968","published-online":{"date-parts":[[2022,8,19]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"233","DOI":"10.1080\/00207218608920863","article-title":"Electronically tunable first-order OTA-capacitor filter sections","volume":"61","author":"Khan","year":"1986","journal-title":"Int. J. Electron."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"660","DOI":"10.1109\/31.55015","article-title":"Realization of current mode all-pass networks using a current conveyor","volume":"37","author":"Higashimura","year":"1990","journal-title":"IEEE Trans. Circuits Syst."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"324","DOI":"10.1109\/82.566650","article-title":"Generation of current conveyor-based all-pass filters from op amp-based circuits","volume":"44","author":"Soliman","year":"1997","journal-title":"IEEE Trans. Circuits Syst. II Analog Digit. Signal Process."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"947","DOI":"10.1080\/002072199132941","article-title":"All-pass filters using a single current conveyor","volume":"86","author":"Cicekoglu","year":"1999","journal-title":"Int. J. Electron."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"9","DOI":"10.1016\/S0026-2692(99)00084-1","article-title":"The application of all-pass filters in the design of multiphase sinusoidal systems","volume":"31","author":"Gift","year":"2000","journal-title":"Microelectron. J."},{"key":"ref_6","first-page":"312","article-title":"New gain controllable resistor-less current-mode first order allpass filter and its application","volume":"21","author":"Jaikla","year":"2012","journal-title":"Radioengineering"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"303","DOI":"10.1080\/002072100132200","article-title":"Simple first order all-pass section using a single CCII","volume":"87","author":"Khan","year":"2000","journal-title":"Int. J. Electron."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"969","DOI":"10.1080\/00207210110063566","article-title":"Supplementary all-pass sections with reduced number of passive elements using a single current conveyor","volume":"88","author":"Toker","year":"2001","journal-title":"Int. J. Electron."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"241","DOI":"10.1515\/FREQ.2003.57.11-12.241","article-title":"A new all-pass section for high performance signal processing with a single CCII\u2212","volume":"57","author":"Metin","year":"2003","journal-title":"Frequenz"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"485","DOI":"10.1080\/00207210412331294595","article-title":"All-pass filters based on CCII\u2212 and CCCII\u2212","volume":"91","author":"Pandey","year":"2004","journal-title":"Int. J. Electron."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"259","DOI":"10.1007\/s10470-009-9301-2","article-title":"Cascadable allpass filter with a single DO-CCII and a grounded capacitor","volume":"61","author":"Metin","year":"2009","journal-title":"Analog Integr. Circuits Signal Process."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.aeue.2013.06.012","article-title":"CCII based more tunable voltage-mode all-pass filters and their quadrature oscillator applications","volume":"68","author":"Yucel","year":"2014","journal-title":"AEU Int. J. Electron. Commun."},{"key":"ref_13","first-page":"10","article-title":"Voltage-mode all-pass filters using universal voltage conveyor and MOSFET-based electronic resistors","volume":"20","author":"Herencsar","year":"2001","journal-title":"Radioengineering"},{"key":"ref_14","doi-asserted-by":"crossref","unstructured":"Herencsar, N., Koton, J., and Hanak, P. (2017). Universal voltage conveyor and its novel dual-output fully-cascadable VM APF application. Appl. Sci., 7.","DOI":"10.3390\/app7030307"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"299","DOI":"10.1007\/s00202-003-0205-3","article-title":"New first-order inverting-type second-generation current conveyor-based all-pass sections including canonical forms","volume":"86","author":"Ibrahim","year":"2004","journal-title":"Electr. Eng."},{"key":"ref_16","first-page":"718","article-title":"A CMOS DCCII with a grounded capacitor based cascadable all-pass filter application","volume":"21","author":"Metin","year":"2012","journal-title":"Radioengineering"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"305","DOI":"10.1080\/03772063.2010.10876319","article-title":"Unity\/variable-gain voltage-mode\/current-mode first-order all-pass filters using single Dual-X second-generation current conveyor","volume":"56","author":"Minaei","year":"2010","journal-title":"IETE J. Res."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"2150150","DOI":"10.1142\/S0218126621501504","article-title":"All-pass frequency selective structures: Application for analog domain","volume":"30","author":"Chhabra","year":"2021","journal-title":"J. Circuits Syst. Comput."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"79159","DOI":"10.1155\/2007\/79159","article-title":"Voltage-mode all-pass filters including minimum component count circuits","volume":"2007","author":"Maheshwari","year":"2007","journal-title":"Act. Passiv. Electron. Compon."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"429391","DOI":"10.1155\/2013\/429391","article-title":"Current conveyor all-pass sections brief review and novel solution","volume":"2013","author":"Maheshwari","year":"2013","journal-title":"Sci. World J."},{"key":"ref_21","first-page":"854","article-title":"Simple first-order multifunction filter","volume":"42","author":"Shah","year":"2004","journal-title":"Indian J. Pure Appl. Phys."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"81","DOI":"10.1016\/j.compeleceng.2004.11.006","article-title":"Current conveyors based allpass filters and quadrature oscillators employing grounded capacitors and resistors","volume":"31","author":"Horng","year":"2005","journal-title":"Comput. Electr. Eng."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"140","DOI":"10.1016\/j.aeue.2018.04.017","article-title":"Voltage-mode first-order universal filter realizations based on subtractors","volume":"90","author":"Abaci","year":"2018","journal-title":"AEU Int. J. Electron. Commun."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"22","DOI":"10.1016\/j.mejo.2019.07.009","article-title":"Electronically controlled voltage mode first order multifunction filter using low-voltage low-power bulk-driven OTAs","volume":"91","author":"Jaikla","year":"2019","journal-title":"Microelectron. J."},{"key":"ref_25","first-page":"433","article-title":"Supplementary filter-order all-pass filters with two grounded passive elements using FDCCII","volume":"20","author":"Metin","year":"2010","journal-title":"Radioengineering"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"113","DOI":"10.1049\/iet-cds.2009.0167","article-title":"Voltage-mode cascadable all-pass sections with two grounded passive components and one active element","volume":"4","author":"Maheshwari","year":"2010","journal-title":"IET Circuits Devices Syst."},{"key":"ref_27","first-page":"345","article-title":"Fully differential first-order allpass filters using a DDCC","volume":"21","author":"Horng","year":"2014","journal-title":"Indian J. Eng. Mater. Sci."},{"key":"ref_28","first-page":"3","article-title":"All-pass sections with high gain opportunity","volume":"20","author":"Ibrahim","year":"2011","journal-title":"Radioengineering"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"525","DOI":"10.1007\/s00034-003-1111-7","article-title":"First-order all-pass filter canonical in the number of resistors and capacitors employing a single DDCC","volume":"22","author":"Ibrahim","year":"2003","journal-title":"Circuits Syst. Signal Process."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"3730","DOI":"10.1093\/ietfec\/e89-a.12.3730","article-title":"Grounded-capacitor first-order filter using minimum components","volume":"E89-A","author":"Chen","year":"2006","journal-title":"IEICE Trans. Fundam."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"457","DOI":"10.1080\/00207210600711481","article-title":"First-order allpass filter and sinusoidal oscillators using DDCCs","volume":"93","author":"Horng","year":"2006","journal-title":"Int. J. Electron."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"881","DOI":"10.1002\/cta.682","article-title":"All-pass filters using DDCC- and MOSFET-based electronic resistor","volume":"39","author":"Metin","year":"2011","journal-title":"Int. J. Circuit Theory Appl."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"57","DOI":"10.1016\/j.aeue.2019.02.017","article-title":"New CFOA-based first-order all-pass filters and their applications","volume":"103","author":"Yuce","year":"2019","journal-title":"AEU Int. J. Electron. Commun."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"153742","DOI":"10.1016\/j.aeue.2021.153742","article-title":"Two-CFOA-grounded-capacitor first-order all-pass filter configurations with ideally infinite input impedance","volume":"137","author":"Senani","year":"2021","journal-title":"Int. J. Electron. Commun."},{"key":"ref_35","doi-asserted-by":"crossref","unstructured":"Jaikla, W., Buakhong, U., Siripongdee, S., Khateb, F., Sotner, R., Silapan, P., Suwanjan, P., and Chaichana, A. (2021). Single commercially available IC-based electronically controllable voltage-mode first-order multifunction filter with complete standard functions and low output impedance. Sensors, 21.","DOI":"10.3390\/s21217376"},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"72","DOI":"10.1049\/iet-cds:20060196","article-title":"High input impedance VM-APSs with grounded passive elements","volume":"1","author":"Maheshwari","year":"2007","journal-title":"IET Circuits Devices Syst."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"511","DOI":"10.1002\/cta.452","article-title":"High input impedance voltage-mode first-order all-pass sections","volume":"36","author":"Maheshwari","year":"2008","journal-title":"Int. J. Circuit Theory Appl."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"123","DOI":"10.1007\/s00034-008-9015-1","article-title":"A canonical voltage-controlled VM-APS with a grounded capacitor","volume":"27","author":"Maheshwari","year":"2008","journal-title":"Circuits Syst. Signal Process."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"391","DOI":"10.1007\/s00034-010-9150-3","article-title":"Novel voltage-mode all-pass filter based on using DVCCs","volume":"29","author":"Minaei","year":"2010","journal-title":"Circuits Syst. Signal Process."},{"key":"ref_40","first-page":"653","article-title":"DVCCs based high input impedance voltage-mode first-order allpass, highpass and lowpass filters employing grounded capacitor and resistor","volume":"19","author":"Horng","year":"2010","journal-title":"Radioengineering"},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"2250184","DOI":"10.1142\/S0218126622501845","article-title":"First-order all-pass filters comprising one modified DDCC\u2212","volume":"31","author":"Abaci","year":"2022","journal-title":"J. Circuits Syst. Comput."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"325","DOI":"10.1007\/s10470-020-01643-8","article-title":"DVCC+ based multifunction and universal filters with the high input impedance features","volume":"103","author":"Alpaslan","year":"2020","journal-title":"Analog Integr. Circuits Signal Process."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"123","DOI":"10.1007\/s10470-009-9435-2","article-title":"First-order voltage-mode all-pass filter employing one active element and one grounded capacitor","volume":"65","author":"Biolek","year":"2010","journal-title":"Analog Integr. Circuits Signal Process."},{"key":"ref_44","unstructured":"(2005, November 05). AD8129\/AD8130: Low Cost 270 MHz Differential Receiver Amplifiers Data Sheet (Rev. C). Available online: https:\/\/www.analog.com."},{"key":"ref_45","unstructured":"(2019, April 29). AD844: 60 MHz, 2000 V\/\u03bcs, Monolithic Op Amp with Quad Low Noise Data Sheet (Rev. G). Available online: https:\/\/www.linear.com."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/22\/16\/6250\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T00:12:35Z","timestamp":1760141555000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/22\/16\/6250"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2022,8,19]]},"references-count":45,"journal-issue":{"issue":"16","published-online":{"date-parts":[[2022,8]]}},"alternative-id":["s22166250"],"URL":"https:\/\/doi.org\/10.3390\/s22166250","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2022,8,19]]}}}