System and method for detecting when an external load is...

Details System and method for detecting when an external load is... System and method for detecting when an external load is...

2005-09-06

2005-09-06

Young, Brian (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

Reexamination Certificate

active

06940440

ABSTRACT:
A system and method for determining when an external load is coupled to a digital-to-analog converter (DAC). Specifically, in one embodiment, a load detector circuit comprises a video DAC, an output circuit, a dumping circuit, and a determining circuit. The video DAC comprises a differential architecture including a first output and a second output working in opposite phase. The first DAC output is coupled to the output circuit, which drives the external load. The second DAC output is coupled to a dumping circuit, and is configured such that the dumping circuit is balanced with the output circuit when the external load is present. A determining circuit examines the two outputs of the DAC to determine if the dumping circuit is balanced with the output circuit, and thus if the external load is present.

REFERENCES:
patent: 5298898 (1994-03-01), Brunheim
patent: 5757298 (1998-05-01), Manley et al.
patent: 6369737 (2002-04-01), Yang et al.
patent: 6411330 (2002-06-01), Purcell et al.
patent: 6563444 (2003-05-01), Zhang et al.
“2.7 V to 5.5 V RGB-to-NTSC/PAL Encoder with Load Detect and Input Termination Switch,” Analog Devices, Inc., Jan. 2000.

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