5-Picosecond Photoconductive Sampling Oscilloscope

摘要

During our Phase I SBIR we developed a novel laser-driven picosecond samplingphotogate that has 5-picosecond temporal resolution and 10-microvolt sensitivity. The sampling gate system is evaluated and applied to several testing environments. To improve the sensitivity further, and lower the required excitation light level, we use a high-impedance transimpedance preamplifier stage. This amplifier permits us to measure signals down to 1 microvolt using less than 10 microwatts of average optical power. The sampling gate technology has now been extended to picosecond time domain reflectometry measurements. Furthermore, we have coupled the picosecond sampling gate to a Picoprobe test probe to measure signals from circuits on wafer. This sampling gate system has now been applied by us to test all our high speed photodetectors. Finally, we