San Jose, Calif. - Moving to strengthen its market position in surface acoustic wave (SAW) filters, Fujitsu Microelectronics Inc. has introduced four devices in surface-mount leadless chip carrier packages for wideband code-division multiple-access (W-CDMA) applications, in the range from 1.95 GHz to 2.14 GHz.
The company also said that by year's end it will be sampling a fifth part, at 5 GHz, for high-speed mobile and wireless access. Until now, Fujitsu's SAW filters targeted applications from 0.8 GHz to 1 GHz. Cell phones currently use as many as five such devices.
The four 1.95- to 2.14-GHz SAW filters include the F6CE-1G9500-L2ZP transmitter and F6CE-2G1400-L2ZQ receiver, each in a 3 x 3-mm package, and the F6CP-1G9500-L21P transmitter and F6CP-2G1400-L21Q receiver, each in a 2.5 x 2-mm package. The packages are less than 1 mm high.
The W-CDMA SAW filters, priced from $1.80 in 10,000-piece quantities, are based on lithium tantalate. They use a "ladder" design that combines on-chip serial and parallel resonators to provide an insertion loss of less than 3.5 dB with high stop-band attenuation, the company said.
The parts are said to support low inductance and offer high resistance to shock, mechanical vibration and climate changes. Impedance is 50 ohms, so the filters can function without external matching circuits. The transmitter filters have one input and one output pin while the receiver filters have one input pin and two balanced output pins, so they can be connected directly to a mixer input.
Fumio Baba, vice president of Fujitsu's System Devices Group, said the upcoming 5-GHz SAW filter will combine electron-beam lithography and reactive ion-etching techniques in a 0.2-micron rule, fine-pattern fabrication process. It will also use Fujitsu's proprietary ladder design and is expected to offer a minimum insertion loss of less than 3 dB and stop-band attenuation of more than 25 dB. Baba said the part's package will be smaller than 2.5 x 2 x 1 mm. It hasn't been priced yet.
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