Out in Front: August 1, 1996

A family of five SAW bandpass filters from Oki Semiconductor is suitable for cellular, wireless LAN, and personal-communications-systems (PCS) applications. Oki designed the filters for systems that operate at 750 MHz to 2 GHz. These filters come in 3.8×3.8-mm plastic/ ceramic packages that are less than 1.6 mm thick—a critical spec in filters targeting ultrathin, lightweight designs.

Input and output impedances of these filters are 50(ohm), and maximum input power is 100 mW. Their insertion loss is less than 3.5 dB with stopband attenuation greater than 20 dB and less than 4 dB for stopband attenuation greater than 30 dB. Passband ripple is less than 1.5 to 2 dB, depending on frequency and bandwidth. The 824- to 849-MHz MBF9301 and 890- to 915-MHz MPF9321 transmitting filters and 869- to 894-MHz MBF9305, 935- to 960-MHz MBF9323, and 917- to 950-MHz MBF9332 receiving filters cost $4 (1000).

—by Bill Schweber

Oki Semiconductor, Sunnyvale, CA. (800) 654-6388, http://www.okisemi.com.