A new compact 90/spl deg/ IF combiner

A new compact 90/spl deg/ IF combiner has been developed for wireless communication applications. Using a simple R-C network, a differential amplifier, and IF amplifiers, an IF combiner has been designed and fabricated. Over 30 dB of gain with phase difference better than 10/spl deg/ from 90/spl deg/ and amplitude balance 2.5 dB from 50 MHz to 250 MHz has been realized in a chip area of 1/spl times/0.7 mm/sup 2/.<<ETX>>

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