Charge transfer in three phase surface channel charge coupled devices
Charge transfer in three phase surface channel charge coupled devices
Inefficiency mechanisms of charge transfer in three phase surface channel charge coupled devices (SCCCDs) are the subject of investigation in this work. The two inefficiency mechanisms studied both theoretically and experimentally in some detail are (1) the backward flow loss and (2) the surface state trapping loss.The backward flow loss occurs in three phase CODs when they arc driven by two level clock waveforms. The transfer inefficiency is seen to be significantly dependent on the turn-off ed,~,a of the clock waveform and also on the charge packet size. Overall inefficiency of the CCD register in the Fat Zero mode of operation has been theoretically calculated and experimentally verified for different signal and Fat Zero sizes in this work.The major contribution to surface state trapping loss is seen to be the 'edge effect' i.e. the Fat Zero charge packet occupying a smaller area under the electrode than the 'One' and thus failing to reduce the trapping loss for the whole region occupied by the One. The loss, in addition to being dependent on the surface state density, is seen to be a function of the difference in areas occupied by the One and the Fat Zero. Theoretical and experimental results are presented for inefficiency for different signal mid Fat Zero sizes when the trapping loss is dominant.7t is seen that the backward flow loss is the dominant inefficiency mechanism at n Lh operating frequencies and that the surface state trapping loss is the limiting inefficiency mechanism at the lower end of the frequency specturm.
University of Southampton
1975
Singh, Michael Pratap
(1975)
Charge transfer in three phase surface channel charge coupled devices.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
Inefficiency mechanisms of charge transfer in three phase surface channel charge coupled devices (SCCCDs) are the subject of investigation in this work. The two inefficiency mechanisms studied both theoretically and experimentally in some detail are (1) the backward flow loss and (2) the surface state trapping loss.The backward flow loss occurs in three phase CODs when they arc driven by two level clock waveforms. The transfer inefficiency is seen to be significantly dependent on the turn-off ed,~,a of the clock waveform and also on the charge packet size. Overall inefficiency of the CCD register in the Fat Zero mode of operation has been theoretically calculated and experimentally verified for different signal and Fat Zero sizes in this work.The major contribution to surface state trapping loss is seen to be the 'edge effect' i.e. the Fat Zero charge packet occupying a smaller area under the electrode than the 'One' and thus failing to reduce the trapping loss for the whole region occupied by the One. The loss, in addition to being dependent on the surface state density, is seen to be a function of the difference in areas occupied by the One and the Fat Zero. Theoretical and experimental results are presented for inefficiency for different signal mid Fat Zero sizes when the trapping loss is dominant.7t is seen that the backward flow loss is the dominant inefficiency mechanism at n Lh operating frequencies and that the surface state trapping loss is the limiting inefficiency mechanism at the lower end of the frequency specturm.
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Published date: 1975
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Local EPrints ID: 462186
URI: http://eprints.soton.ac.uk/id/eprint/462186
PURE UUID: 1566514e-6db0-4d36-b666-8ef37acaf126
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Date deposited: 04 Jul 2022 19:03
Last modified: 04 Jul 2022 19:03
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Author:
Michael Pratap Singh
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