Wide band frequency input transformer - has input impedance and amplifier across its output terminals

摘要

An assembly is used to improve the parameters and increase the frequency band of an input transformer used in telecommunication units. The improvements are obtained without increasing the size of the transformer. The assembly consists of two series impedances (3,4), the transformer (1) and an amplifier (2). The amplifier (2) provides a virtual short-circuit and is connected across the output terminals of the transformer (1). The amplifier (2) may be an inverting amplifier with feedback resistor or feedback unit. The two series resistors (3,4) may be replaced by an input amplifier. The amplifiers may have separate and independent power supplies.