| 摘要 |
<p>PHB 33.107 11 A battery economising circuit for use with one or more operating circuits, for example a part or parts of a radio circuit, in which battery economising circuit an opposed current mirror type of current reference circuit (18) determines entirely the current consumed by the operating circuit (10). A control circuit (22) is connected to a point in the reference circuit (18) from which current can be extracted. The control circuit (22) in response to an OFF signal causes a portion of the current in the reference circuit (18) to be diverted so that the reference circuit (18) cannot sustain its normal ON-state and in response thereto assumes its OFF-state in which the operating and control circuits (10,22) do not take current. The control (22) further includes means whereby current can be injected into the current reference circuit (18) to cause it to assume its ON state and in consequence the operating circuit (10) takes current. In the case of there being several current reference circuits (18,18') and associated control circuits (22,22'), but the inputs (24,24') of the control circuits (22,22') are all connected to a common signalling bus (26).</p> |
