Power transistor output match network with high Q RF path and low Q low frequency path

A method of operating a power circuit, including:

• coupling an output match network to an output of a power device, the output match network including a blocking capacitor which forms part of a high quality factor RF path;
• providing a range of high frequency gain over a signal bandwidth and a low frequency gain peak outside the signal bandwidth which corresponds to a low frequency resonance of the high quality factor RF path;
• coupling a bypass network in parallel with the blocking capacitor of the output match network, the bypass network comprising a series connected inductive component and capacitor coupled in parallel with the blocking capacitor of the output match network, wherein the inductive component of the bypass network is operable to confine RF signal energies to the high quality factor RF path of the output match network;
• and
• attenuating the low frequency gain peak via the bypass network while maintaining the high quality factor RF path.

A circuit package, comprising:

• a substrate;
• a first die on the substrate, the first die including a power device;
• an output terminal on the substrate;
• an output match network coupling an output of the power device to the output terminal, the output match network including a blocking capacitor which forms part of a high quality factor RF path, the blocking capacitor included in a second die on the substrate, the output match network operable to provide a range of high frequency gain over a signal bandwidth and a low frequency gain peak outside the signal bandwidth;
• and
• a bypass network coupled in parallel with the blocking capacitor of the output match network, the bypass network comprising a series connected inductive component and bypass capacitor coupled in parallel with the blocking capacitor of the output match network, wherein the inductive component of the bypass network is operable to confine RF signal energies to the high quality factor RF path of the output match network and wherein the bypass network is operable to attenuate the low frequency gain peak while maintaining the high quality factor RF path.

A method of fabricating a circuit package, comprising:

• providing a substrate;
• arranging a first die on the substrate, the first die including a power device:
• arranging an output terminal on the substrate;
• coupling an output of the power device to the output terminal via an output match network including a blocking capacitor which forms part of a high quality factor RF path, the blocking capacitor included in a second die on the substrate, the output match network operable to provide a range of high frequency gain over a signal bandwidth and a low frequency gain peak outside the signal bandwidth;
• and
• coupling a bypass network in parallel with the blocking capacitor of the output match network, the bypass network comprising a series connected inductive component and bypass capacitor coupled in parallel with the blocking capacitor of the output match network, wherein the inductive component of the bypass network is operable to confine RF signal energies to the high quality factor RF path of the output match network and wherein the bypass network is operable to attenuate the low frequency gain peak while maintaining the high quality factor RF path.