Phase Compensation of Ideal Inductances Based Second-Generation Current Conveyors

The equivalent impedance of the conventional ideal inductance implemented from two second-generation current conveyors is firstly calculated taking all the parasitic elements into account. Its equivalent electrical schema, which comprises six components is characterized. It is demonstrated that the most important deviation at high frequencies comes from the phase shifts of the transfers of the conveyors. Compensation of these effects are obtained from the first-order compensation method using a single additive resistor. SPICE simulations using an industrial BiCMOS process are used to demonstrate the validity of this approach. As an example, the current conveyors being DC biased with I0 = 100μA and supplied under ±2.5 V, an inductance of 0.67 μH was found directly usable without compensation up to about 15 MHz. This frequency range is then extended up to about 100 MHz when the circuit has been compensated from a single resistor of 75 Ω.