STMicroelectronics' new ParaScan Tunable Integrated Capacitors (STPTIC) are designed to dynamically optimize handset antenna performance by electrically adjusting to maintain efficient transfer of energy from the handset amplifier to the antenna under various operating conditions. The STPTIC helps maximize radiated RF power for better call performance, overcoming the challenges of use in multiple frequency bands, when the handset is held close to the user’s ear or when it is moved away from the head, while minimizing amplifier power consumption for longer battery life.
The STPTIC allows capacitance to be adjusted smoothly, without steps, for greater precision. The STPTIC family uses the latest and most advanced generation of ParaScan Barium Strontium Titanate (BST) variable-capacitor technology. These devices meet the demands of wireless system designers by displaying high Q factor at frequencies up to 2.7 GHz, more than 3:1 capacitance change with varying control voltage, and stable performance over the specified temperature range. Devices are easy to design-in, requiring only minimal external components, and have high power capability meeting the requirements of the GSM standard.
Major features of the STPTIC family:
Range of capacitance values: 2.7 to 8.2 pF
High power capability (+36 dBm)
High tuning range (3.5:1)
High linearity device (IP3 > 60dB)
High Quality factor (Q factor) up to 2.7 GHz
Low leakage current (Less than 100 nA)
Compatible with ST antenna tuning circuit (STHVDAC series)
The STPTIC devices in the 6-pin microDFN and flip-chip packages are sampling now to lead customers direct from ST only, at prices starting at $0.50 and $0.48 respectively for volumes in the range of 1,000 pieces.