Vol. 10 No 4 August 2002
RF Front-end Supercomponents with EDLVA
Supercomponents integrate various active and passive microwave functions in a single compact package. Supercomponent approach to subsystems increases reliability and repeatability and is inescapable where amplitude/phase matching is required over a set of units. Radio frequency (RF) front-end subsystem with extended dynamic range detector log video amplifier (EDLVA) has been designed using various state-of-the-art technologies to achieve the required stringent characteristics and specifications and is fabricated in a single housing using supercomponent methodology. EDLVA supercomponents are used in amplitude comparison direction finding (DF) subsystem of electronic warfare (EW) systems. RF front-end supercomponents with EDLVA are manufactured by M/s Astra Microwave Pvt Ltd, Hyderabad.
Solid State Power Amplifiers
RF amplifiers are used in radar, communication, and EW systems where high power output performances are needed. The amplifiers are designed using large signal models/ measured data of high power active devices. These amplifiers are constructed using standard thin film hybrid MIC techniques. They are compact, rugged and are well suited as driver amplifier in transmitter and RF distribution networks, expendables, output amplifier in decoy transmitter, etc. The amplifiers are manufactured by M/s Karnataka Tele Electronics Ltd, Bangalore.
Phase correlator is used in phase comparison DF subsystems, digital instantaneous frequency measurement subsystems, etc. It consists of two double balanced mixers and two 45° phase shifters, and provides two equal amplitude intermeDIATe frequency (IF) outputs that are in phase quadrature. The RF is introduced to the two double balanced mixers through one 45° phase shifter and the local oscillator (LO) is introduced through another 45° phase shifter in away that it gives 90° phase difference between the RF and LO signals resulting in two IF outputs of equal magnitude but in phase quadrature (normally denoted as sin q and cos q, where q is the phase difference between two incoming signals). The correlator is manufactured by M/s CEL Sahibabad.