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Analog Angle Article

3G/LTE transceiver needs no SAW filter; handles multiple modes, bands

Sunnyvale, Calif—Designed for 3GPP LTE/WCDMA/EGPRS wireless phones, a transceiver from Fujitsu Microelectronics America eliminates the need for interstage SAW filters as well as an external low noise amplifier (LNA).



Figure 1: MB86L10A from Fujitsu Microelectronics America needs no SAW filter; handles multiple modes, bands

(Click on image to enlarge)

The highly integrated, monolithic MB86L10A supports GSM (GSM850, EGSM900, DCS1800, PCS1900), WCDMA (Bands I, II, III, IV, V, VI, VIII, IX, X and XI) and LTE (FDD Bands 1, 3, 4, 6, 7, 8, 9, 10, 11, 13, 17 and TDD band 38 or 40). The transceiver includes dual 3G and 4G DigRF interfaces to the baseband IC to support the latest as well as legacy generations of basebands, SPI and/or GPOs control PAs, switching regulators and antenna switches.

Vivek Bhan, senior director of RF Engineering and Product Development for Fujitsu Microelectronics America, noted that the component includes eight outouts to directly drive the multiple RF PAs, as well as five ports to support receiver diversity functions in WCDMA and LTE modes. Digital channel filters, digital gain control, and wide-dynamic-range analog/digital converter are controlled by the user's system processor but operate autonomously, thus significantly offloading that processor. He added that the single-chip transceiver features backward compatibility with a high-level programming model (API) for radio control using DigRF/MIPI D3G and D4G open standard digital interfaces, all of which makes it compatible with a wide range of industry basebands.

Fujitsu offers an evaluation board and associated GUI for user evaluation, and expects to have a reference design in August. The MB86L10A requires three power rails, of 2.7, 1.8, and 1.2 V, and dissipates less than 15 μA in deep-sleep mode; operating power depends heavily on specific operational mode, functions being invoked, and the specific PA and interface configuration.—Bill Schweber

Packaging and availability : Samples are available now in 230-pin, 6.5 mm x 9.0 mm x 0.9 mm LGA packages.

For more information : The Fujitsu MB86L10A transceiver fact sheet is available here.

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