MICRF114 datasheet(20/34 Pages) MICROCHIP

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MICRF114

DS50002416A-page 20

Preliminary

 2015 Microchip Technology Inc.

4.2

Measurement Results

The important parameters for regulatory standard com-

pliance are measured on PICtail™ boards for the two

most popular operating frequencies using the fre-

quency-dependent components listed in Table 4-1. The

MICRF114 operates in CW mode. Harmonics and

spurs are measured at +10 dBm output power setting.

Matching network, cable, and connector losses are not

compensated to ensure that the actual power readings

on the spectrum analyzer are slightly less.

Measurement results are shown in Figure 4-2 through

Figure 4-7. Note that the regulations limit the radiated

field strength at a given distance. The maximum usable

power setting at a given frequency and geographic

region can be determined only if the antenna gain is

known. The level of the fundamental carrier signal and

all possible out-of-band signals – harmonics, spurs,

and integrated phase noise – must be taken into

account. The filter network can be simplified at low-

radiated power.

FIGURE 4-2:

HARMONIC LEVELS AT 315 MHZ

FIGURE 4-3:

SPURIOUS LEVELS AT 315 MHZ

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