Conclusion

Designing a CCD controller for CCD220 requires the use of high frequency techniques usually nonessential in scientific CCD controllers due to the low readout speed. Particular care has to be taken with wire length that introduces parasitic inductance, especially when high current flows are present. The approach of classical CCD controllers with separate control electronics connected to the CCD head by long wires are widely used in astronomy but are not applicable in this case. A fully integrated approach must be used to place all the CCD drive electronics close to the chip and therefore in close conjunction with mechanical and cryogenic design.

Figure 2. Overshoot cancellation (large trace) with a controlled drive shape (small trace) and a parasitic capacitance of 10 nH.

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