Gyrator Circuit Makes DC Supply Invisible For AC Testing

摘要

A specific example would be a UUT powered by a 48-V dc source (Fig. 1). The UUT typically has a dc current sink with high ac impedance implemented by the UUT's gyrator circuit. It also has a specified termination impedance across the current sink. For equipment connected to a telephone line, this could be 600 Ω. Signal generator V2 in series with source termination Zo is connected to the UUT to make ac measurements.