Equalizer Filters offer Flat Pass Band Ripple

RFMW announces design and sales support for a range of front-end filters incorporating variable gain equalizers. For example, the Sangshin EQ42R1747S75A is a 1747.5 MHz filter with 75 MHz pass band (Band 3 Uplink) which integrates a variable gain equalizer. The equalizer is set via a variable resistor and enables a 1 dB gain variation at the passband low end with negligible effect on the upper end. This adjustment enables the flattest possible passband ripple entering the receive chain before it’s amplified by subsequent LNAs. Coupled with an available Downlink equalizer filter, the EQ42R1747S75A optimizes front-end performance for enterprise level small cell applications. User specific equalizer filter solutions are available for frequencies between 1 to 4 GHz and for a wide range of bandwidths.