| 摘要 |
A cell/battery (10) is excited by a time-varying signal that is characterized by periodically making step transitions between discrete levels. The immediate change in a responsive signal is determined by a circuit (14) that is only enabled during a brief "window" of time encompassing a step transition, and which employs a "holding capacitor" (C1) to store dynamic conditions existing at the instant of enablement. Action of this "holding capacitor" (C1) causes the circuit to only respond to changes in noise signals occurring during the enablement "window" and not to the actual level of the noise itself.
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