Advanced tunable chips
31 January 2013
ST’s ParaScan Tunable Integrated Capacitors (STPTIC) are electrically adjustable to maintain efficient transfer of energy from the handset amplifier to the antenna under various operating conditions.
The STPTIC helps maximise 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 minimising amplifier power consumption for longer battery life.
Unlike alternatives that typically contain multiple switched capacitors, the STPTIC allows capacitance to be adjusted smoothly, without steps, for greater precision. The STPTIC is also smaller, combining a single, variable capacitor with control circuitry using ST’s Integrated Passive and Active Device (IPAD) technology.
The STPTIC family use 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.
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