Quad channel wide band frequency conversion with integrated LO for high IF Bandwidth

Abstract

Quad channel wideband frequency conversion unit converts wide band RF (Radio frequency) input band to Intermediate frequency (IF) band, with built in Local Oscillator (LO) signals. Down conversion architecture proposed here is for Electronic Warfare (EW) applications. Input RF signal is first separated into three bands based on frequency as Sub RF Band 1 (L Band), Sub RF Band 2 (C Band) & Sub RF Band 3 (S Band). Wideband RF diplexer separates sub RF Band 2 & 3. Sub RF Band 1 is processed directly. Sub RF Band 2 & 3 are down converted to IF Bands. Four such identical channels of processing/ down conversion are implemented. LO signals in C band are built in and are generated using Phase Locked loops (PLL). Super heterodyne down conversion architecture is employed here. Sub RF bands processing, LO generation & distribution are all implemented on composite dielectric multilayer printed circuit boards. The proposed architecture provides instantaneous interleaved IF processing bandwidth (BW) of 4000 MHz, Typical Gain of 7 dB, Typical Noise Figure (NF) of 12 dB, Harmonics & Intermodulation products performance of -50 dBc, LO & Image rejection of -50 dBc.