Tunable capacitors for 4G smartphone PAs

Tunable capacitors – STPTIC-15G2

Designated the Stptic G2 range, the capacitors now have a 5:1 tuning ratio which means they can add extra correction when signal matching  between a smartphone’s antenna and power amplifier.

Other improvements include lower parasitic resistance and inductance as well as a higher ESD rating.

Designed to meet linearity specifications of 3G/4G modulation, the Stptic capacitors are available in eight standard values from 1.5pF (STPTIC-15G2) to 8.2pF (STPTIC-82G2), and are controlled using a bias voltage from 1V to 24V.

This can be provided by ST’s STHVDAC-253M controller, which provides three outputs to control the capacitors in multiple antenna systems.

The capacitors are available in 4-bump 0.4mm-pitch flip-chip packages.