Patent ID: 8653809
Filing Date: 2014-02-18
Classification: G01R,H03M

Abstract:
1. A three-state indicator, comprising: a voltage generator, for generating a first voltage, a second voltage, and a third voltage; a three-state detector having a voltage input end coupling to the voltage generator for receiving the first voltage, the second voltage, and the third voltage, wherein the voltage input end selectively receives the first voltage, the second voltage, or the third voltage to generate an indication signal indicating an input voltage at the voltage input end, wherein the indication signal is a two-bit indication signal, and the input voltage is the first voltage, the second voltage, or the third voltage; a first type sub-detector module, connected to the voltage generator, for receiving the first voltage, the second voltage, and the third voltage, and for outputting a first bit of the two-bit indication signal, wherein the first bit is at a low level when the input voltage is the first voltage, and the first bit is at a high level when the input voltage is the second voltage or the third voltage; and a second type sub-detector module, connected to the voltage generator, for receiving the first voltage, the second voltage, and the third voltage, and for outputting a second bit of the two-bit indication signal, wherein the second bit is at the low level when the input voltage is the first voltage or the second voltage, and the second bit is at the high level when the input voltage is the third voltage; wherein the first voltage is smaller than the second voltage, the second voltage is smaller than the third voltage.