Patent ID: 9450545
Filing Date: 2016-09-20
CPC Classification: H03F

Claim Text:
1. A dual-band semiconductor RF amplifier device, the device comprising a transistor having an output capacitance, a first shunt element arranged in parallel with the output capacitance, the first shunt element comprising a first shunt inductor connected in series with a first shunt capacitor, and a second shunt element arranged in parallel with the first shunt capacitor, the second shunt element comprising a second shunt inductor connected in series with a second shunt capacitor, wherein the dual-band semiconductor RF amplifier device is configured to be able to operate at a first operating frequency and a second operating frequency, said second operating frequency being smaller than said first operating frequency, wherein a capacitance of the second shunt capacitor is such that it forms a short at both the first and second operating frequency, wherein the first shunt inductor, the second shunt inductor, and the first shunt capacitor are configured to form an inductance that resonates with the output capacitance at both the first and second operating frequency.