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Differential Signal Path for 64 ch ZTF Mosaic

Differential Signal Path for 64 ch ZTF Mosaic. Roger Smith and Stephen Kaye California Institute of Technology. Differential preamp is line driver. e2v 231-C6:. Signal out. Electronics outside telescope beam. Commercial Twinax. Dummy out. Pros of differential

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Differential Signal Path for 64 ch ZTF Mosaic

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  1. Differential Signal Pathfor 64 ch ZTF Mosaic Roger Smith and Stephen KayeCalifornia Institute of Technology

  2. Differential preamp is line driver e2v 231-C6: Signal out Electronics outside telescope beam Commercial Twinax Dummy out • Pros of differential • Video cross talk reduced •  negligible ? • Less susceptible to interference. • These become common mode errors which are rejected: • Bias noise • Ground differentials • Reset feedthrough • Clock feedthrough • Clamp control feedthrough. • AC coupler drift •  clamp once per line. • Cons • CCD noise is incurred twice. • CCD output power is doubled.

  3. No hand wiring COTS cables to electronics outside beam Samtec ERDP-049 twinax 32 pair Glenair 177-710 shielded 100 pin • Vacuum Interface Board • 1/8” thick PCB carries preamps • Trapped between two O-rings • in side wall and back cover. • Signals routed on internal layers. • Outer layers are isolated, in contact with case: conduct heat from preamps. • Eliminates hermetic connectors. • COTS cables connect directly to edges: all custom wiring in PCB. A A-A A

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