Linear output stage for charge-coupled circuits

Details Linear output stage for charge-coupled circuits Linear output stage for charge-coupled circuits

1979-09-06

1981-11-24

Munson, Gene M.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307304, 357 24, G11C 1928, H03K 3353, H01L 2978

Patent

active

043026850

ABSTRACT:
A linear output stage for charge-coupled circuits is disclosed. Charge-coupled circuits (CCDs) are of significance in the processing of analogue signals as they can be used as analogue shift registers. Conventional output circuits of CCDs are constructed with source followers. The non-linear characteristic of an MOS source follower which is provided with an external load resistor is substantially linearized by means of a highly ohmic source resistor. A fundamental disadvantage of these output circuits is that the evaluation of the signal is mainly carried out by means of a space charge capacitance which is voltage-dependent since it is dependent upon space charge depth. In the output stage disclosed, the signal charge is mainly absorbed by means of a constant oxide capacitance of the evaluator electrode. The electrode receives the charge not in floating fashion but rather at a fixed potential.

REFERENCES:
patent: 4048519 (1977-09-01), Hoffman et al.
patent: 4074206 (1978-02-01), Horninger
patent: 4139784 (1979-02-01), Sauer
Barbe "Imaging Devices Using the Charge-Coupled Concept" Proc. IEEE vol. 63 (1/75) pp. 38-67.

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