Performance Evaluation
54
CG635 Synthesized Clock Generator
each value given in Table 25. Record the frequency measured by the SR620. The actual
frequency is 10 times the reported frequency. Verify that the measured frequency is
within the limits specified in Table 25.
Table 25: Test frequencies from 1.0 to 2.0 GHz
Set Freq. (GHz)
Min Freq. (Hz)
Measured Freq. (Hz)
Max Freq (Hz)
1.0 999,999,999.0
1,000,000,001.0
1.1 1,099,999,999.0
1,100,000,001.0
1.2 1,199,999,999.0
1,200,000,001.0
1.3 1,299,999,999.0
1,300,000,001.0
1.4 1,399,999,999.0
1,400,000,001.0
1.5 1,499,999,999.0
1,500,000,001.0
1.6 1,599,999,999.0
1,600,000,001.0
1.7 1,699,999,999.0
1,700,000,001.0
1.8 1,799,999,999.0
1,800,000,001.0
1.9 1,899,999,999.0
1,900,000,001.0
2.0 1,999,999,999.0
2,000,000,001.0
Frequencies 100 MHz to 1.0 GHz
The SR620 can measure frequencies below 1.0 GHz directly. Use the setup shown in
Figure 8 for frequencies from 100MHz to 1.0 GHz. Configure the SR620 as described
above. Make sure that the channel A input has the UHF prescaler activated.
Figure 8: Setup for frequency measurements below 1.0 GHz.
Set the frequency of the CG635 to each value given in Table 26. Record the frequency
measured by the SR620. Verify that the measured frequency is within the limits specified
in Table 26.
Table 26: Test frequencies from 100 MHz to 1.0 GHz
Set Freq. (MHz) Min Freq. (Hz)
Measured Freq. (Hz)
Max Freq (Hz)
100.0 99,999,999.0
100,000,001.0
200.0 199,999,999.0
200,000,001.0
300.0 299,999,999.0
300,000,001.0
400.0 399,999,999.0
400,000,001.0
500.0 499,999,999.0
500,000,001.0
600.0 599,999,999.0
600,000,001.0
700.0 699,999,999.0
700,000,001.0
800.0 799,999,999.0
800,000,001.0
900.0 899,999,999.0
900,000,001.0
1000.0 999,999,999.0
1,000,000,001.0
Q
Q
CMOS
CG635
SR620
EXT A
B REF
10 MHz OUT
10 MHz IN
50
Ω
terminator
