PRE-EMPHASIS OUTPUT CIRCUIT WITH ADJUSTABLE TAPPED DELAY LINE

摘要

A pre-emphasis output circuit is provided to perform a pre-emphasis operation without inputting an additional clock signal and recovering a clock of data because a plurality of delayers does not have the same delay time. In a pre-emphasis output circuit, a main driver(11) receives and amplifies a data signal, and outputs the data signal at an output terminal. A shared load(14) is connected to the output terminal of the main driver. A delay line(13) includes a plurality of delayers which are connected in series and control delay time according to a control voltage respectively, receives the data signals and outputs the delay signals to delay the data signals as much as the delay time, to each delayer. A plurality of tap drivers(121,122,123,124) amplify the delay signals and includes the pre-emphasis output circuit connected to add the delay signals at an output terminal of the main driver.