Combined output driver
AssigneeVIA Technologies, Inc.
InventorsWen-Bo Liu, Yu-Feng Cheng, Ken-Ming Li, Vai-Hang Au
Life of this patent
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Abstract
A combined output driver for TMDS signals and LVDS signals. A first output driver includes a first differential unit generating a first differential according to first input signals in a first mode and a first clamping device coupled between the first node and the first differential unit to clamp potentials at two power terminals below a second power voltage. The second output driver includes a second differential unit generating a second differential signal according to second input signals in a second mode and a second clamping device to clamp potentials at two output terminals of the second differential unit below the second power voltage.
Claims24
A combined output driver for transmitting video signals, comprising:
- a first output driver outputting a first differential signal to a first external input unit through a pair of output signal lines according to first input signals in a first mode, the first output driver comprising:
- a first current source coupled between a first power voltage and a first node;
- a first differential unit generating the first differential signal according to the first input signals and comprising two power terminals;
- and
- a first clamping device coupled between the first node and the first differential unit to clamp potentials at the two power terminals below a second power voltage;
- and
- a second output driver outputting a second differential signal to a second external input unit through the pair of output signal lines according to second input signals in a second mode.
A combined output driver for transmitting video signals, comprising:
- a first output driver outputting a first differential signal to a first external input unit through a pair of output signal lines according to first input signals in a first mode, the first output driver comprising:
- a first differential unit generating the first differential signal according to the first input signals, and comprising two output terminals;
- and
- a first clamping device coupled between the pair of output signal lines and the first differential unit to clamp potentials at the two output terminals below a first power voltage;
- and
- a second output driver outputting a second differential signal to a second external input unit through the pair of output signal lines according to second input signals in a second mode.
Dependencies are inferred from the claim text.