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A new active circuit is proposed for the realisation of lossless grounded and floating inductance employing Voltage Differencing Differential Input Buffered Amplifiers (VD-DIBAs). The proposed grounded simulated inductance circuit employs two VD-DIBAs and a single-grounded capacitor whereas the floating simulated inductance circuit employs three VD-DIBAs and a grounded capacitor. The circuit for grounded inductance does not require any realization conditions whereas in case of floating inductance, only equality of two transconductances is needed. Some sample results demonstrating the applications of the new simulated inductors using VD-DIBAs have been given to confirm the workability of the new circuits.

Several synthetic grounded and floating inductance circuits using different active elements such as operational amplifiers (op-amps) [

The schematic symbol and equivalent model of the VD-DIBA are shown in Figures

(a) Schematic symbol and (b) equivalent model of VD-DIBA [

Proposed grounded inductance simulation configuration.

Proposed floating inductance simulation configuration.

A routine analysis of the circuit shown in Figure

Let

For the circuit shown in Figure

Non-ideal equivalent circuit of grounded inductor of Figure

The non-ideal equivalent circuit of floating inductor is shown in Figure

Non-ideal equivalent circuit of floating inductor of Figure

The workability of the proposed simulated inductors has been verified by realizing a band pass filter (BPF) and band reject filter (BRF), respectively.

Figure

BPF realized by the new grounded simulated inductor.

The transfer function realized by this configuration is given by

BRF realized by the new floating simulated inductor.

The transfer function realized by this configuration is given by

A possible implementation of VD-DIBA.

Frequency response of simulated grounded inductor.

Frequency response of simulated floating inductor.

To verify the theoretical analysis, the application circuits shown in Figures

Parameters | VD-DIBA | OTA (CA 3080) | CMOS OTA (Figure |
---|---|---|---|

Input voltage linear range | −120 mV to 120 mV | −25 mV to 25 mV | −109 mV to 109 mV |

−3 dB Bandwidth | 121 MHz | 2 MHz | 119 MHz |

Power consumption | 62.5 mW | 30 mW | 0.194 mW |

Frequency response of BPF using simulated grounded inductor.

Frequency response of BRF using simulated floating inductor.

Phase response of BPF using simulated grounded inductor.

Phase response of BRF using simulated floating inductor.

Step response of Figure

Simulated spectrum of the output signal Vo in Figure

CMOS implementation of OTA.

Among various modern active building blocks, VD-DIBA is emerging as quite flexible and versatile building block for analog circuit design. However, the use of VD-DIBA in the realization of grounded/ floating inductor had not been known earlier. This paper has filled this void by introducing new VD-DIBA- based grounded and floating inductor configurations. This paper, thus, has added a new application circuits to the existing repertoire of VD-DIBA-based application circuits. The workability of new propositions has been confirmed by SPICE simulations.

The authors gratefully acknowledge Professor Dr. R. Senani, Director and Head, Division of Electronics and Communication Engineering, NSIT, Sector-3, Dwarka, New Delhi, India, for useful discussions/suggestions and his help in the preparation of this paper. The authors also like to acknowledge Dr. R. K. Sharma for his help in SPICE simulation.