Wideband reconfigurable impedance matching network

An apparatus including a transformer-based impedance matching network comprising:

• a primary side transformer circuit including a primary inductor configured to provide impedance matching over a first frequency band, and one or more additional primary inductor branches coupled to the primary inductor via one or more switches to dynamically adapt impedance matching for one or more additional frequency bands;
• a secondary side transformer circuit arranged to be inductively coupled to the primary side transformer circuit and including a secondary inductor configured to impedance matching over the first frequency band, and one or more additional secondary inductor branches coupled to the secondary inductor via one or more switches to dynamically adapt impedance matching for the one or more additional frequency bands;
• and
• an inductor capacitor (LC) filter circuit coupled to an output of the secondary side transformer circuit and including an inductor and a capacitor in series and configured to notch-filter harmonic frequencies within the first frequency band, and one or more additional LC circuit branches coupled to the output via one or more switches to dynamically adapt the LC filter circuit to notch-filter different harmonic frequencies over the one or more additional frequency bands.

A computer readable tangible medium including instructions that, when executed by a processor, cause the processor to adapt a transformer-based impedance matching network to match a differential source signal having an impedance ZS to a load having an impedance ZL over a plurality of operating frequencies by performing the steps of:

• determining a frequency (FT) of the differential source signal;
• and
• switching the matching network between one of a plurality of impedance matching configurations comprising:
• a base configuration including a main primary inductor inductively coupled to, a proximate main secondary inductor when the frequency FT is within a first operating frequency band;
• a second configuration including the base configuration and an additional primary inductor branch coupled to the main primary inductor when FT is within a second operating frequency band;
• and
• wherein the matching network further comprises one or more filter branches with the secondary inductor branch, each comprising an inductor coupled to an output of the main secondary conductor in series with a capacitor coupled to ground, each filter branch selected to notch filter harmonics within one of first second or third operating frequency bands.

A communication device including a transformer-based impedance matching network adapted to operate over three or more different frequency bands, the communication device comprising:

• a power amplifier circuit configured to provide a differential transmit signal over said least three different transmit frequency bands;
• one or more antennas to transmit and/or receive over the at least three different transmit frequency bands;
• and
• an impedance matching network coupling the power amplifier circuit to the one or more antennas, the matching network adaptable to impedance match over the three or more different frequency bands and comprising:
• a primary side inductor circuit having a main primary inductor and one or more additional primary inductor branches each including a switch to modify impedance of the matching network for a given operating frequency;
• a secondary side inductor circuit having a main secondary inductor and one or more additional secondary inductor branches each including a switch to modify impedance of the matching network for said given operating frequency;
• and
• a plurality of LC harmonic filter branches, one for each operating frequency.