| 摘要 |
PURPOSE:To quicken the conversion speed by using a current switch so as to switch cyclicly plural output currents generated from a digital/analog conversion means converting a signal into a current corresponding to plural input data strings inputted cyclicly so as to generate a D/A conversion output thereby eliminating glitch. CONSTITUTION:A data is inputted cyclicly to data input terminals 1A, 1B, the current switches 3A, 3B are switched to send the current of current source arrays 2A, 2B to ladder resistor arrays 5A, 5B. The current receives a base potential by a bias power supply 8 and given to common base transistors (TRs) 6A, 6B biased by bias currents 7A,7B. The current takes a value corresponding to each input data. Moreover, the current of blocks A, B is outputted alternately to an output terminal 13 by the current switches 10A, 10B switched alternately by the clock 12 operated by the clock pulse 11. The switching operation is attained at a time not including glitch of each converted current and no glitch is caused at the output terminal.
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