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Article: A SIMPLE GAIN EQUALIZER FOR A PCS-BAND AMPLIFIER.
- Article from:
- Microwave Journal
- Article date:
- November 1, 2000
- Author:
CopyrightCOPYRIGHT 2000 Horizon House Publications, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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A simple distributed network is described, which has the effect of flattening the frequency response of an amplifier or system by reducing its gain in a particular frequency range. Operating with a quarter-wave line coupler (which can be printed on the circuit board), the equalizer acts as a very shallow notch filter with controlled bandwidth.
Microwave power amplifiers with operating bandwidths that are a few percent of their center frequency, similar to those used in today's cellular and PCS base stations, achieve efficiency with tuned networks on the inputs and outputs of the power devices. These networks are intended to negate, in part, the unavoidable ...