µPC8001

13

Figure 3-6.

Noise Figure Measurement

The noise figure is calculated as follows:

NF = ENR – 10 log (Y – 1)

NF (dB):

Noise figure

ENR (dB): ENR of noise source

Y: Y = 10

Remark

This measurement measures DSB. To measure SSB, add 3 dB to NF above.

10

11

9

14

MIX IN1

OSC IN

MIX OUT

5 pF

0.01

µF

107 nH

HP8447F

RF

Amp

Spectrum

analyzer

47 dB

50

Ω

0.01

µF

0.01

µF

3 k

Ω

Noise source

HP346B

SW

28 V