LOW NOISE AMPLIFIER USING DC/AC TRANSFORMER

摘要

PURPOSE: A low noise amplifier using DC/AC transformer is provided to prevent a receiving sensitivity from being reduced by attenuating a variation of a noise factor during an amplifying operation. CONSTITUTION: A switch preforms an on/off operation to treat with a signal input for adjusting a signal output. A pair of voltage distribution resistances are connected parallel and adjacent to the signal output terminal. An error amplifier(14) receives the voltage distributed from the distribution resistances to give an output if the distributed voltage is above a predetermined voltage. A comparator(14) receives to compare an output signal from the error amplifier with a signal from an oscillator. A driver(15) receives an output signal from the comparator to output a control signal for controlling the switch. A regulator(11) for internal voltage adjustment makes an internal voltage changing during an on/off operation of the switch to be constant.