| 摘要 |
A circuit for generating a relatively-long-duration timing signal whose duration is a fixed multiple of the duration of a variable, relatively-short duration gating signal. The circuit utilizes a constant current source, for charging an RC timing circuit, and a constant current sink that are intercoupled by a first switching means. The gating signal closes the first switching means permitting the RC timing circuit to discharge through the constant current sink at a constant rate over the duration of the gating signal. The closing of the first switch means operates to open a second switch means that is coupled to the RC timing circuit at the same node as is the first switch means. The second switch means remains open during the time the RC timing circuit is being recharged at a linear or constant rate by the constant current source back to its initial level.
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