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RF Tunable Capacitors

ST’s Parascan™ Tunable Integrated Capacitors (STPTIC), available with typical capacitance from 1.5 pF to 8.2 pF, are dedicated to RF tuning optimization within mobile phone applications.

The first generation of tunable capacitors (G1 devices) are controlled through a bias voltage ranging from 2 to 20 V, with a tuning ratio of 3.5 to 1.
The new series of tunable capacitances (G2 devices) are controlled through a bias voltage now ranging from 1 to 24 V and provide a tuning ratio of 5 to 1.

All devices in ST’s STPTIC family feature high-quality Parascan™ dielectric and now share a common package footprint and pin-out that allows the use of different nominal capacitances without changing the board design. They are available now in a 4-bump 0.4 mm-pitch flip-chip and 0.5 mm pitch QFN package.

ST takes up the challenge of a 5 to 1 tuning ratio with its STPTIC G2 series

ST’s new generation of STPTIC tunable capacitors extends the range – with the new G2 series – with a typical capacitance range, starting from 1.5 pF now, to 8.2 pF. These ‘G2’ tunable capacitors are now controlled through an extended bias voltage range – from 1 to 24 V – with a tuning ratio of 5 to 1.
They are housed in a 4-bump 0.4-mm-pitch flip-chip package and are initially available as evaluation samples in 1.5pF (nom) STPTIC-15G2, 3.9pF (nom) STPTIC-39G2 and 6.8 pF (nom) STPTIC-68G2 versions.

The STPTIC capacitors are controlled using a bias voltage from 1V to 24V, such as ST’s STHVDAC-253M controller, designed specifically to deliver the wide-tuning bias-voltage required. The controller provides three outputs to control STPTICs for multiple antennas and connects to the smartphone host system via an industry-standard RF Front-End (RFFE) interface.

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