Pulse and Digital Circuits

5.4 SYNCHRONIZED CLAMPING

In the clamping circuits examined in this chapter, the duration for which clamping is effective is controlled by the signal alone—the signal remains clamped as long as its amplitude remains unaltered. However, in some applications it may become necessary that the time of clamping be determined by the control or gating signal that occurs synchronously with the signal. Two or more signals are said to be synchronized if they arrive at a particular reference point in their cycles at the same time. The simultaneous presence of the gating signal during the period of constant amplitude input enables the two waveforms to be synchronized and the output to be referenced to V_R. One typical application could be in a CRO, where, ...