Datasheet HMC903 (Analog Devices) - 8

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HMC903 Data Sheet THEORY OF OPERATION
The HMC903 is a GaAs, pHEMT, MMIC, low noise amplifier. Consequently, the device can be directly inserted into a 50 Ω The HMC903 amplifier uses two gain stages in series. The basic system with no required impedance matching circuitry; therefore, schematic for the amplifier is shown in Figure 19, which forms a multiple HMC903 amplifiers can be cascaded back to back low noise amplifier operating from 6 GHz to 18 GHz with excel ent without the need for external matching circuitry. noise figure performance. The input and output impedances are sufficiently stable vs.
VDD1 VDD2
variations in temperature and supply voltage that no impedance matching compensation is required.
RFIN RFOUT
It is critical to supply very low inductance ground connections 019 to the exposed pad to ensure stable operation. To achieve optimal
VGG1 VGG2
14481- performance from the HMC903 and to prevent damage to the Figure 19. Basic Schematic for the HMC903 device, do not exceed the absolute maximum ratings. The HMC903 has single-ended input and output ports with impedances nominal y equal to 50 Ω over the 6 GHz to 18 GHz frequency range. Rev. C | Page 8 of 13 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ELECTRICAL SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS INTERFACE SCHEMATICS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION APPLICATIONS INFORMATION MOUNTING AND BONDING TECHNIQUES FOR MILLIMETERWAVE GaAs MMICS HANDLING PRECAUTIONS Storage Cleanliness Static Sensitivity Transients General Handling Mounting Eutectic Die Attach Epoxy Die Attach Wire Bonding TYPICAL APPLICATION CIRCUITS ASSEMBLY DIAGRAMS OUTLINE DIMENSIONS ORDERING GUIDE