High-Q inductance circuit using an integrator and its application

In this paper we propose a high- inductance simulation circuit using an integrator and a voltage-current converter. This is followed by a description of an application of this circuit to realize a high- bandpass amplifier. The input voltage , is integrated and the resulting output is converted to a current whose magnitude and phase are proportional to those of . So the phase angle of lags by almost 90 degs. The design of the integrator circuit which provides a phase lag of 90 degs is described; analysis of the effect of element tolerances and temperature variations, frequency range over which the effective inductance has nearly constant value, and the maximum value of attainable by adjusting the circuit parameters are presented. It is also shown that over a frequency range of about 1 Hz-500 kHz, maximum values of in the range of 500-1500 may be realized stably. Finally, a frequency selective amplifier using an inductance circuit with an unloaded of 830 is described to illustrate the stability of such high- circuits.