Current cell driving circuit in digital-to-analog converter
AssigneeElectronics and Telecommunications Research Institute
InventorsSeung Chul Lee, Jong Kee Kwon, Kwi Dong Kim, Kyung Soo Kim
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Abstract
The present invention relates to a current cell driving circuit in a digital-to-analog converter. The current cell driving circuit limits the potential of differential control signals to a given potential level by means of a voltage limiter using a parasitic capacitance of a transistor. Therefore, the present invention can effectively limit the potential of differential control signals DP and DN without compromising the power consumption and the circuit area and also can minimize the transfer time.
Claims7
A digital-to-analog converter (DAC) including a current cell driving circuit for generating first and second differential control signals and a current cell operating as a current source depending on said first and second differential control signals, the current cell driving circuit comprising:
- a latch means for latching input signals depending on a clock signal to output first and second latch signals;
- and
- a voltage limiter means for limiting said first and second differential control signals to a given level according to said first and second latch signals,
- wherein said voltage limiter means includes:
- a first inverter for outputting said first differential control signal and level of which is limited to a given level, according to said first latch signal, and
- a second inverter for outputting said second differential control signal the level of which is limited to a given level, according to said second latch signal.
Dependencies are inferred from the claim text.