Low-power switch state detection circuit and method and mobile telephone incorporating the same
First Claim
Patent Images
1. A circuit for detecting a signal level on a node, comprising:
- a switch coupled between a voltage source and said node;
a detection circuit coupled to said node and configured to detect a signal level at said node only on closure of said switch; and
a pulse generator coupled to said switch and said detection circuit and configured to generate a single pulse in a cycle that controls both the detection circuit and the switch such that the single pulse closes said switch and enables said detection circuit at the same time, wherein said switch is open and said detection circuit is disabled when said single pulse is not generated.
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Abstract
A circuit for, and method of, detecting a signal level on a node and a mobile telephone device incorporating the circuit or the method. In one embodiment, the circuit includes: (1) a switch coupled between a voltage source and the node, (2) a pulse generator coupled to the switch and configured to generate a pulse to control the switch and (3) a detection circuit coupled to the node and configured to detect a signal level at the node on closure of the switch.
16 Citations
24 Claims
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1. A circuit for detecting a signal level on a node, comprising:
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a switch coupled between a voltage source and said node; a detection circuit coupled to said node and configured to detect a signal level at said node only on closure of said switch; and a pulse generator coupled to said switch and said detection circuit and configured to generate a single pulse in a cycle that controls both the detection circuit and the switch such that the single pulse closes said switch and enables said detection circuit at the same time, wherein said switch is open and said detection circuit is disabled when said single pulse is not generated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of detecting a signal transition at a node, comprising:
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generating a single pulse in a cycle with a pulse generator, said single pulse; closing a switch, said switch periodically switching a bias voltage to said node, and; enabling a detector, said detector detecting a change in said state of said node only on closure of said switch, wherein said switch is open and said detector is disabled when said single pulse is not generated. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification