User Guide

PAMS
Technical Documentation
NME–3
Technical Information
Page 58
Issue 1 10/99
Table 45. (continued) UHF VCO module, Electrical specifications, Zo=50 ohm
Unit/
Notes
RatingConditionsParameter
Tuning voltage in center frequency f = 1013.5 MHz 2.25 +/– 0.25 V
Tuning voltage sensitivity in operating
frequency range on each spot freq.
Vcc = 2.8 V
f=1006...1031
MHz
16+/– 2 MHz/V
Output power level Vcc=2.7 V
f=1006...1031
MHz
–6.0 min. dBm
Output impedance and VSWR f=1006...1031
MHz
50 ohms,VSWR
<2
Phase noise, fo +/– 25 kHz
fo +/– 600 kHz
fo +/– 1600 kHz
fo +/– 3000 kHz
Vcc=2.8 V
f=1006...1031
MHz
–100
–120
–130
–140
dBc/Hz
max.
Pulling figure VSWR=2, any
phase
+/– 1.0 MHz
max.
Pushing figure Vcc=2.8 +/– 0.1
V
+/– 2.0 MHz/V
max.
Frequency stability over temperature
range
Ta=–30 ... +85
deg. C
+/– 3.0 MHz
max.
Harmonics –10 max. dBc
Spurious Vcc=2.8 V,
Vc=0...6 V
–70 max. dBc
Input capacitance in Vc–pin Vc= 0 V 100 max. pF
UHF VCO Buffer
Table 46. Buffer for RX downconverter
Parameter Min. Typ. Max. Unit/Notes
Supply voltage 7.8 8.0 8.2 V
Supply current 15 mA
Frequency range 1006 1031 MHz
Input power –6 dBm
Output power 6 dBm
1 dB input compression –7 dBm
IIP3 +3 dBm
Harmonics –45 dBc
The RX LO buffer is a discrete realization and amplifies the UHF LO signal
to the level required by the RX mixer.