Patent ID: 8610504

Claim:
A dual band amplifier comprising: a first matching circuit disposed in a first radiofrequency path between an input port having an input port impedance and a first amplifier having a first impedance, the first matching circuit configured to transmit the first impedance to the input port when a radiofrequency signal received at the input port is in a second frequency range and configured to transform the first impedance to the input port impedance when the radiofrequency signal is in a first frequency range, the first amplifier including a cascade amplifier and a first source switch transistor, a source of the cascade amplifier being connected to a drain of the first source switch transistor, and a gate of the first source switch transistor being connected to control circuitry configured to enable the first amplifier when the radiofrequency signal is in the first frequency range; and a second matching circuit disposed in a second radiofrequency path between the input port and a second amplifier having a second impedance, the second matching circuit configured to transmit the second impedance to the input port when the radiofrequency signal is in the first frequency range and configured to transform the second impedance to the input port impedance when the radio frequency signal is in the second frequency range.