Design and implementation of fast bipolar clock drivers for CCD imaging systems in space applications

Jayesh Jayarajan; Nishant Kumar; Amarnath Verma; Ramkrishna Thaker

doi:10.1117/12.2223730

2 May 2016 Design and implementation of fast bipolar clock drivers for CCD imaging systems in space applications

Jayesh Jayarajan, Nishant Kumar, Amarnath Verma, Ramkrishna Thaker

Proceedings Volume 9881, Earth Observing Missions and Sensors: Development, Implementation, and Characterization IV; 988128 (2016) https://doi.org/10.1117/12.2223730
Event: SPIE Asia-Pacific Remote Sensing, 2016, New Delhi, India

Abstract

Drive electronics for generating fast, bipolar clocks, which can drive capacitive loads of the order of 5-10nF are indispensable for present day Charge Coupled Devices (CCDs). Design of these high speed bipolar clocks is challenging because of the capacitive loads that have to be driven and a strict constraint on the rise and fall times. Designing drive electronics circuits for space applications becomes even more challenging due to limited number of available discrete devices, which can survive in the harsh radiation prone space environment. This paper presents the design, simulations and test results of a set of such high speed, bipolar clock drivers. The design has been tested under a thermal cycle of -15 deg C to +55 deg C under vacuum conditions and has been designed using radiation hardened components. The test results show that the design meets the stringent rise/fall time requirements of 50±10ns for Multiple Vertical CCD (VCCD) clocks and 20±5ns for Horizontal CCD (HCCD) clocks with sufficient design margins across full temperature range, with a pixel readout rate of 6.6MHz. The full design has been realized in flexi-rigid PCB with package volume of 140x160x50 mm³.

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Jayesh Jayarajan, Nishant Kumar, Amarnath Verma, and Ramkrishna Thaker "Design and implementation of fast bipolar clock drivers for CCD imaging systems in space applications", Proc. SPIE 9881, Earth Observing Missions and Sensors: Development, Implementation, and Characterization IV, 988128 (2 May 2016); https://doi.org/10.1117/12.2223730

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KEYWORDS

Clocks

Charge-coupled devices

Transistors

Sensors

Capacitors

Electronics

Imaging systems

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