Giga-tronics 80350A, Руководство по эксплуатации и техническому обслуживанию

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Manual 21568, Rev. F, March 2008
3
Theory of Operation
3.1 Introduction
This chapter describes the electrical operation of the Series 8035XA Peak Power Sensors.
Refer to the block diagram in Figure 3-1 to follow the general function of the sensor. The RF
signal is rectified in the sensor element, and the video envelope is buffered and delayed by the
input amplifier and delay buffers. This buffered envelope is available at the Detector Out
connector. The Track and Hold (T&H) function tracks and follows the signal and then holds it for
hundreds of microseconds. The Sample and Hold (S&H) function acquires the S&H output and
holds it for hundreds of milliseconds.
The timing circuitry generates the sample pulses from the trigger input or, if the sensor is in the
free run mode, from an internal oscillator.
The block diagrams, circuit descriptions, and the troubleshooting information in Chapter 4 are
written around the circuit test points. The delay lines shown in Figure 3-1 are illustrated in the
Analog Timing Diagram in Figure 3-3. Delay lines match the delay through the analog channel
to the sample point, and the delay through the timing circuitry to the sample generator. Since
fixed lumped constant delay lines are used, the match is not perfect. The delay through the