Electronically tunable CFTA based positive and negative grounded capacitance multipliers

New negative‐grounded capacitance multiplier circuits

“…Since, in this paper, we have proposed new configurations of negative capacitance multiplier; therefore, a brief summary of previously reported negative capacitance multipliers employing different ABBs along with CFOAs [25][26][27][28][29][30][31][32][33][34][35][36][37] has been presented here to put the proposed work in proper perspective.…”

“…Use of more than one ABB 25,26,[28][29][30][31][32][34][35][36][37] 2. Employment of floating capacitor 25,[27][28][29]31,32,[34][35][36][37] 3. Use of nonavailable off-the-shelf IC [26][27][28][29][30][31] 4.…”

“…Employment of floating capacitor 25,[27][28][29]31,32,[34][35][36][37] 3. Use of nonavailable off-the-shelf IC [26][27][28][29][30][31] 4. Requirement of matching constraint 31,33 5.…”

“…Requirement of matching constraint 31,33 5. Low MF (<200) [27][28][29][30][31][32] In view of the above, it appears that no single CFOA-based negative capacitance multiplier has been presented yet, which can provide high MF (>1200), employing grounded capacitor without any passive component matching condition(s). Therefore, the main aim of this communication is to present new negative capacitance multiplier circuits with features not available in existing NGCM circuits as shown in Table 1.…”

“…For low frequency applications, mostly higher value capacitance is used that increases the size of capacitor (which requires large area on silicon chip and not suitable from the view point of IC fabrication) 1–3 . Consequently, to alleviate these limitations, researchers and circuit designers have stimulated various positive CMs 4–24 and negative CMs, 25–37 employing different active building blocks. These CMs may find various applications in the design of low frequency filters, low frequency oscillators, and integration of a phase‐locked loop filter 38 .…”