Agilent Technologies E5500 Series Dokumentacja Pobierz pdf (Strona 7)

Minimum duty cycle

The duty cycle of the pulsed carrier has a direct

impact on the system noise floor. This is seen as

a scaled degradation of the noise floor by 20 log

(duty cycle) in a residual measurement, due to

a scaling of detector constant by the duty cycle.

While the recommended minimum duty cycle of

1 percent was selected to provide a usable noise

floor, it is possible to reduce the duty cycle even

further, providing the system noise floor remains

low enough to be useful for the measurement.

Table 2-2. Noise Floor Degradation with Duty Cycle

Duty Cycle Noise Floor Degradation

50% 6 dB

10% 20 dB

1% 40 dB

Figure 2-3. Baseband pulse transients

(max. LNA gain and 20 MHz LPF)

Figure 2-4. Baseband pulse transients

(max. LNA gain and 2 MHz LPF)

1 2 3 4 5 6 7 8 9 10 11 12 ... 35 36

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Agilent Technologies E5500 Series Dokumentacja Strona 7