Generalized Sampling Principle
Original Publication Date: 1983-Aug-01
Included in the Prior Art Database: 2005-Feb-07
This article relates generally to pulse sampling techniques and more specifically relates to a sampling technique which uses room temperature devices in a voltage-controlled mode. Fig. 1 illustrates the sequential sampling principle which is used in commercially available sampling oscilloscopes. The prior-art oscilloscopes utilize a voltage-controlled switch such as a diode with an I-V characteristic shown in Fig. 1B. A pulse vp(tÅt) forward biases the diode, causing capacitor C to be charged. During the time of pulse vp(tÅt), the unknown signal vs(t) is sampled and the voltage across capacitor C is proportional to vs(t). As t is varied, the whole waveform is replicated. The time resolution of such a system is given directly by the pulse duration.