Patent ID: 7659740
Filing Date: 2010-02-09
Classification: G01R

Abstract:
1. A method of digitally testing a differential driver circuit, comprising: activating a test enable signal; skewing a differential output termination impedance in response to said test enable signal; adjusting a voltage offset of a differential receiver circuit in response to said test enable signal; selecting a power level for said differential driver circuit in response to said test enable signal, wherein said selected power level does not overpower said skewed output termination impedance; enabling a decoder in response to said test enable signal, wherein said decoder activates only one segment of said differential driver circuit during a test sequence; activating one of said segments for testing; stimulating said differential driver circuit with digital test patterns; receiving an output of said differential driver circuit by said differential receiver circuit, wherein said differential driver output is in response to said digital test patterns; converting said received differential driver output to a single-ended signal; observing said single-ended signal; and deactivating said test enable signal.