Ultrafast Differential Sampling of Waveforms on Coplanar Transmission Lines
Original Publication Date: 1987-Feb-01
Included in the Prior Art Database: 2005-Jan-31
It has been demonstrated that an ultrashort electrical pulse can be generated on a coplanar transmission line by photoconductively shorting the charged line with a picosecond laser pulse [*]. The present publication describes an extension of this technique, known as the "sliding contact" technique, to the sampling of a waveform on a coplanar transmission line. The key advantage of this new configuration is that it provides a true differential sampling between the two lines forming the transmission line, at the point where it is being sampled. This is in sharp contrast with the traditional sampling which uses a side gap shorted by a laser pulse to recover the waveform on the transmission line, and mainly renders information about the signal on the line closest to the probe.