Boonton 4240 RF Power Meter Uživatelský manuál stáhnout pdf (Strana 111)

Boonton 4240 Series RF Power Meter

6.1.2 Diode Detection

Wideband diode detectors are the dominant power sensing device used to measure pulsed RF signals. However, several diode

Detector Response. The response of a single-diode detector to a sinusoidal input is given by the diode equation:

v = net voltage across the diode

ed in F

The curv r output is proportional to the

square o gnal level e output is proportional to the input. In between

these ran tor response lies bet aw and linea

For accu over all three regio sponse is pre-calibrated over

the entir on data is stored in t and recalled to adjust each sample of the pulse power

measure

characteristics must be compensated to make meaningful measurements. These include the detector’s nonlinear amplitude

response, temperature sensitivity, and frequency response characteristic. Additional potential error sources include detector

mismatch, signal harmonics and noise.

where:

i = diode current

Is = saturation current

α = constant

An ideal diode response curve is plott igure 6-3.

Figure 6-3.

Ideal Diode Response

e indicates that for low microwav vels (Regio the sing -diode

f the input power. For high input si s (Region C linearly

e input le n A), le detecto

), th

ges (Region B), the detec ween square-l r.

rate power measurements ns illustrated in Figure 6-3, the detector re

e range. The calibrati he instrument

ment.

Application Notes

6-3

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Boonton 4240 RF Power Meter Uživatelský manuál Strana 111