Patent ID: 7649399

Claim:
A signal generating apparatus, comprising: a first logic generating device, for outputting a signal of a first logic value; a second logic generating device, for outputting a signal of a second logic value; and a first signal switching apparatus within an integrated circuit, the first signal switching apparatus comprising a first input end, a second input end, a first output end, a second output end, a first switch, a second switch, a third switch, and a fourth switch, wherein the first input end and the second input end of the first signal switching apparatus are coupled to the first logic generating device and the second logic generating device respectively, the signal of the first logic value is transmitted from the first input end to the first output end of the first signal switching apparatus when the first switch is turned on, the signal of the first logic value is transmitted from the first input end to the second output end of the first signal switching apparatus when the third switch is turned on, the signal of the second logic value is transmitted from the second input end to the second output end of the first signal switching apparatus when the second switch is turned on, the signal of the second logic value is transmitted from the second input end to the first output end of the first signal switching apparatus when the fourth switch is turned on, and the first switch, the second switch, the third switch, and the fourth switch are turned on or turned off by patterning a conductive layer of the first signal switching apparatus with a corresponding mask within the integrated circuit, such that signals input from the first input end and the second input end of the first signal switching apparatus are output from the first output end and the second output end of the first signal switching apparatus respectively, or signals input from the first input end and the second input end of the first signal switching apparatus are output from the second output end and the first output end of the first signal switching apparatus respectively.