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Design, Development and Qualification of 64 channel Hybrid Analog Multiplexer for Space Applications
Keywords: analog multiplexer, radiation hardened, space application
Satellite payload electronics, demanding more savings in weight and volume requires miniaturization of the circuit block which is repeatedly used. As part of this requirement, 64 channels hybridized analog multiplexer (HAMUX) has been developed for instruments to be flown in next generation Indian Meteorological satellites. The HAMUX is developed using qualified multilayer thick film hybrid technology and is as per ISRO-PAS-206 ‘Qualification requirements for thick film hybrid microcircuits' document. The basic building block of HAMUX is radiation hardened, fault protected 16:1 channel analog multiplexer. The HAMUX can handle channel input voltage greater than power supply voltage with or without power to the device. All the inputs including control have ESD protection networks. In order to keep the cross talk within acceptable limits of 35-40dB, hybrid layout design is critical and care has been taken to avoid crossing of channel input and control signal / power supply input. Provision is also made to have voltage reference, either internal or external. Cascade inputs are provided to have up-to 256 channel multiplexing provision. Both buffered (Analog buffer) and un-buffered (Multiplexer) outputs are provided to have better user flexibility. This is a radiation hardened hybrid having Total Ionization Dosage (TID) of more than100Krads. This hybrid can be used for Housekeeping analog information for GEO and LEO satellite payloads as well as Video signal multiplexing for multispectral Instruments. The HAMUX has been successfully qualified under the ‘Circuit Type Qualification (CTQ)' program for use onboard the satellites. The qualification matrix is based on the guidelines of MIL-PRF-38534 Class K. Flight devices are ready for integration onto the meteorological satellite.
Krishna Prasad, Manager-Design
Centum Electronics Limited
Bangalore, Karnataka 560106,

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