A negative‐impedance‐converter circuit for higher frequencies

The main weakness of the Yanagisawa negative‐impedance‐converter circuit is the large phase shift of its current conversion gain h 21 at higher frequencies. The reason for this phase shift is the collector capacitances of the two transistors. The addition is suggested here of a capacitor that balances out the effect of these capacitances as far as h 21 is concerned. A real and constant h 21 results, up to higher frequencies. Another capacitor compensates for the effect of the transistor capacitances on h 22 . The remaining two h parameters need no such compensation. Experimental results confirm all these conclusions.