
AN1207
6
MOTOROLA
techniques demand a trade off between this voltage range
and the spectral purity of the VCO output. This is because the
lower the control voltage range, the more sensitive the VCO
is to noise coming into its control input.
A VCO IC may not offer enough performance for some
applications. Therefore, the VCO may have to be designed
from discrete components.
Figure 6 shows the performance of the VHF Oscillator
prototype on a spectrum analyzer. Note that the reference
sidebands appear at 100 kHz as expected, and are 50 dB
down.
REFERENCES
Motorola data sheet MC145170/D
Motorola data sheet MC145170–1/D
Motorola data sheet MC145170–2/D
Motorola application note AN535/D
Figure 6. VHF Oscillator Performance
CENTER = 150 MHz, SPAN = 250 kHz
1
100 kHz
100 kHz
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Mfax is a trademark of Motorola, Inc.
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Motorola Fax Back System
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