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Download WS1050 Tunable RF Capacitor
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WS1050 Tunable RF Capacitor Applications General Description Technology The WS1050 tunable RF capacitor combines three individually addressable capacitors into a single chip. The device reduces cost, board space, and design time while improving linear performance and design flexibility. It enables very small, narrow-band antennas to be tuned over a wide frequency range, while eliminating the need for a separate Long Term Evolution (LTE) antenna. Each CMOS-integrated capacitor is tunable from 0.6 to 6.0pf – in step sizes of 1/10th pf – for 18pf of total capacitance. These highly flexible capacitors can be configured individually in series or shunt, with an individual pin-out for each capacitor. • Mobile devices including smartphones, feature phones and tablets • Wireless infrastructure equipment including basestations, picocells, femtocells, and WiFi routers • Current network architectures including LTE and LTE Advanced • Future network architectures including 600mHz • Measurement/Test instruments, phase shifters • Tunable filters and amplifiers WiSpry’s unique capacitor offers benefits for both mobile device and wireless infrastructure OEMs. Smartphone designers can now design once for multiple product iterations. For basestations, picocells, femtocells and WiFi routers, the WS1050 enables designers to address complex signal mismatch environments. The WS1050 delivers the industry’s highest Q, offering the widest impedance coverage and lowest loss. This exceptional performance enables designers to tune for the highest “mismatched” conditions, including challenging form factors and non-ideal environments. The linear performance of the chip produces third harmonics as low as 150dBc, achieved by the chip’s proprietary MEMS-based technology. Features • Tune antennas and amplifiers for signal chain gains up to 3dB • Eliminates a separate LTE antenna • Completely integrated solution saves board space and external component cost • Broadband antenna tuning IMAGE PLACEHOLDER with an SRF above 3.5gHz WS1050 simplified block diagram WS1050 Tunable RF Capacitor Hardware Selectable USID Feature The RFFE interface can be configured to be backwards compatible with earlier generation WiSpry parts. In addition, the WS1050 adds six extra slave identifiers for a total of eight as per the MIPI® Alliance RFFE specification. Compact LGA Package & System Solution With full integration and minimal number of external components required, WS1050 can be used in the smallest form factor designs. Tunable Capacitor Function Hardware Wakeup – XCTRL Pin Functionality Serial Interface Control WS1050 features a hardware control pin, allowing control of the charge pump without using the control bus. The WS1050 features a serial interface that is compatible with MIPI® RFFE1.1 signaling. The serial interface controls the WS1050 operating mode as well as the capacitor settings. Capacitor Configuration The WS1050 contains three high–Q, high linearity, tunable series MEMS capacitors. All capacitors are series configuration (both terminals are floating) and thus can be used in series or shunt configuration. This enables use in L and π type networks as well as bundled into one or several large series or shunt capacitors. Each capacitor is digitally controllable between the values Cmin and Cmax and steps in capacitance with the miniumum step size LSB. ROHS The WS1050 is compliant with lead free requirements of the Directive 2002/95/EC of the European Parliament and of the Council on the restriction of hazardous substances in electrical and electronic equipment (“RoHS”). WS1050 Tunable RF Capacitor Recommended Application Schematic Electrical Characteristics Description / Conditions TYP Units 2.5 – 5.0 V Supply Current Standby 1.0 A Supply Current Active, Average 38 A Supply Voltage Operating Range 0.5 – 6.0 pF Smallest Capacitance Step 0.1 pF Capacitor Q, Mid setting @ 800 MHz 150 Second Order Harmonic at Cmax Setting, 24 dBm Input Power -110 dBm Third Order Harmonic at Cmax Setting, 24 dBm Input Power -130 dBm Serial Interface Input Clock Frequency maximum 26 MHz MIPI® RFFE Reference Voltage 1.8 V Capacitance range, per bank MIPI® specifications and trademarks are property of MIPI® Alliance, Inc. WiSpry, Inc. WS1050 - 1113 20 Fairbanks #198, Irvine, CA 92618 +1 949 458 9477 Copyright 2013 WiSpry, Inc. All Rights Reserved. www.wispry.com