Agilent Technologies HP 8642A/B Dokumentacja Pobierz pdf (Strona 147)

100

101

Estimating the Discriminator Constant

The Phase Detector Constant can be estimated directly from the R port

input power level. (Providing the power level requirements for driving

the L port of the phase detector are being met.) A power meter or a

spectrum analyzer can be used to measure the power level. Compare the

measured R port level to the following graph to determine the Phase

Detector Constant.

L Port Signal Level

Auumid to b

Approximate Phase Noise Floor (dBc/Hz)

Appropriate for the ' ' '

Phase Detector f > "| Q |<H 2

Note:

This relationship assumes a 9 dB conversion loss in the Phase Detector.

Figure 2-22. Estimate of Phase Detector Constant for a Given R Port input Level

An estimate of the Discriminator Constant {KQ) can be derived from an

estimate of the Phase Detector Constant

(K(j>).

The following equation converts the Phase Detector Constant {K^) to a

Discriminator Constant (KD).

= 2-KTK^

where K$ = Detector Constant

Kjy = Discriminator Constant, and

= the delay of the discriminator

2-78 Calibr Process: $N w/FM Discriminator

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