Delay Amplifiers
Frequently, it is necessary to delay an analog signal to align its
arrival with the arrival time of a gating logic signal. This is the
function of a delay amplifier. It provides an adjustable delay of
the analog signal while preserving the shape and amplitude of the
analog pulse. Figure 26 is a typical example involving a coincidence
measurement between two detectors. Coincidence timing information is
derived from the bipolar zero crossing on the two amplifier outputs
using timing single- channel analyzers. The coincidence gating
signal would normally arrive at the multichannel analyzer gate input
too late to straddle the peak amplitude of the unipolar amplifier
output pulse from detector 1. The delay amplifier is used to delay
the unipolar output pulse until its peak amplitude is synchronized
with the logic pulse at the gate input of the multichannel analyzer.
Figure 26. Use of a Delay
Amplifier to Align Analog and Gating Logic Signals. |
