Single VDTA-based Lossless and Lossy Electronically Tunable Positive and Negative Grounded Capacitance Multipliers

A New Method to Synthesise the Sinusoidal Oscillator Based on Series Negative Resistance-Capacitance and its Implementation Using a Single Commercial IC, LT1228

“…Table I compares the proposed negative simulator with those negative simulators [19]- [26]. The proposed circuit can function as a negative capacitor in series with a negative resistor, while lossless negative capacitance simulators are proposed in [19]- [22], [24]- [26]. The simulator proposed in [23] functions as a negative inductor in series with a negative resistor.…”

“…The employment of both negative and positive impedance elements permits the design of more complicated circuits, which can result in enhanced stability, higher efficiency, and a wider frequency tuning range. This can be especially beneficial in signal creation, filtering, and amplification applications that require steady oscillation with specified frequency response characteristics parasitic element rejection, sine wave oscillator, and impedance matching [19]- [26].…”

Single current follower differential input transconductance amplifier based grounded lossy capacitance multiplier with large multiplication factor

“…In Ozenli et al, 22 a lossy capacitance multiplier has been presented using a single VDTA and one capacitor, with an electronically tunable multiplication factor falling in the range of 115–150. In Petrović, 23 three CM circuits have been implemented using a single VDTA (two of them are lossless employing one VDTA, one grounded resistor and a floating capacitor) while the third is a lossy grounded capacitance multiplier implemented with one grounded resistor and one floating capacitor with a tunable multiplication factor remaining constant from 10 kHz to 1 MHz. The VDTA in all these circuits is implemented with Arbel–Goldminz cell (one half of complete VDTA configuration).…”

“…These circuits can be categorized as lossless/lossy and/or grounded/floating capacitance multiplier circuits and are used in the design of analog filters and oscillators. Many lossless CM circuits 1,[4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] and a few lossy capacitance multiplier circuits [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36] employing different ABBs have been reported in literature. As the present work focusses on lossy capacitance multipliers, in the following, we provide a detailed description of previously reported lossy CM circuits to put the proposed work in proper perspective.…”

“…From Table 1, it is seen that there have been limited number of designs of lossy capacitance multipliers in the open literature using various ABBs such as VDTA, VDBA, CFOA, OTA, DVTC, and ECCII. [22][23][24][25][26][27][28][29][30][31][32][33][34] A circuit with parallel immittance simulator having negative resistance and positive capacitance is useful in oscillator design and only one circuit, using two CFOAs, two resistors and one capacitor, has been reported in Özer et al 30 Therefore, in this paper, a new lossy capacitance multiplier circuit is proposed using a single CFDITA, one resistor and one capacitor. The performance of the proposed circuit is validated using 0.18 μm CMOS technology with CFDITA, and experimental results using commercially available ICs AD844 and LM13700 are included to support its performance.…”