U2796B

Preliminary Information

Rev. A2, 15-Oct-98

7 (11)

87

6

5

12

3

4

C 2

3

C

IP3

R

N

C 4

1

C

LO

generator

R = 50

W

i

LO

S

V

r

C

U2796B

Noise

source

RF

Noise

figure

meter

93 7763 e

IFO

IFO

i

i

Figure 9. Test circuit-noise figure

Note:

1.

The noise floor of the LO generator might influence the noise figure test result. In order to avoid this,

either a band pass or a high pass filter with fc

2.

If IF output network does not provide sufficient suppression of the LO component, a low pass filter

should be inserted to avoid overdriving the noise figure meter.

3.

For best noise performance 0 dBm LO power level is required.