US Patent 9077290 Low-noise amplifier with impedance boosting circuit

A low-noise amplifier (300) is provided which comprises an input circuit (301) configured to operate with a variable bias current and an impedance boosting circuit (314) electrically connected to the input circuit (301). The impedance boosting circuit (314) comprises at least one switch (316) and at least one tail inductor (318) electrically connected with the at least one switch (316). The low-noise amplifier (300) is configured to activate the impedance boosting circuit (314) if the variable bias current is reduced, and the impedance boosting circuit (314) is configured to increase the input impedance of the low-noise amplifier (300) if the impedance boosting circuit (314) is activated.