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■ REFERENCE INFORMATION
1. Application Measurement
• Test Results
Lockup time ±1 kHz
Un lock → Lock
Power on → Lock
Reference leakage (∆f = 58 kHz)
Phase noise
V
(V)
CC
VCO
• Measurement Circuit
1000 pF
S.G
1000 pF
50 Ω
(∆f = 1 kHz)
(∆f = 10 kHz)
(∆f = 100 kHz)
(∆f = 1 MHz)
= 3.0 V
V
CC
fin
MB15C101
OSCin
Results
2.3 ms
3.4 ms
–88.5 dBc
–88.0 dBc/Hz
–111.0 dBc/Hz
–118.0 dBc/Hz
–134.0 dBc/Hz
3.0 V
Discrete VCO (Kv = 3.5 MHz/V)
Lock Frequency = 274.0 MHz (fr = 58 kHz)
18 Ω
18 Ω
Loop Filter
R1
R2
C1
C3
C2
MB15C101
18 Ω
Spectrum
Analyzer
VCO
C1 = 6800 pF
C2 = 0.068 µF
C3 = 4800 pF
R1 = 3.0 kΩ
R2 = 3.9 KΩ
11
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