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where
df
dV
= V.C.O. sensitivity.
The maximum permissible ripple voltage, which will produce side bands
more than 80 dB below the required signal, can be calculated for different
ripple frequencies and scale ranges.
For 80 dB suppression of the side bands
~m
must be less than, or equal
to, 10-
4 •
~ -~ ~1o-
4
.J2
fm
dV
~
J2fm
. 10-4
"""'
df/dV
Frequency
Bandwidth
Scale
(Hz)
x0.1 lin
3.16- 10
- -
31.6
-
-
100
x0.1 log
3.16- 10
-
-
31.6
-
-
100
x1 lin
3.16- 10
-
-
31.6
- -
100
x1 log
3.16- 10
- -
31.6
- -
100
x10 lin
3.16- 10
- -
31.6
- -
100
x101og
3.16- 10
- -
31.6
-
-
100
Maximum Ripple Voltage
fm =50 Hz
fm
=100Hz
35 t.tV
70 t.tV
2.2 mV
224 t.tV
35 mV
21.2 mV
5.1 t.tV
10.2 t.tV
315 t.tV
32 t.tV
5.1 mV
3.1 mV
3.5 t.tV
7 t.tV
220 t.tV
22.4 t.tV
3.5 mV
2.12mV
0.51 t.tV
1.0 t.tV
31.5 t.tV
3.2 t.tV
510 t.tV
310t.tV
0.35 t.tV
0.7 t.tV
22 t.tV
2.24 t.tV
350 t.tV
212 t.tV
0.05 t.tV
0.1 t.tV
3.15 t.tV
0.32 t.tV
51 t.tV
~1
t.tV
Table 9.5.
Maximum permissible ripple in the Frequency Control Voltage
depending on Bandwidth and Frequency Scale
90
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