User Guide

PAMS
Technical Documentation
NME–3
Technical Information
Page 49
Issue 1 10/99
Table 26. (continued) Electrical characteristics
unitmax.typ.min.Parameter
Bandwidth relative to 71 MHz
1 dB bandwidth
3 dB bandwidth
5 dB bandwidth
22 dB bandwidth
30 dB bandwidth
40 dB bandwidth
+/– 90
+/–120
+/– 230
+/– 350
+/– 550
+/– 700
kHz
Spurious rejection, fo +/– 26 MHz 65 dB, *
Terminating impedance ( balanced )
resistance
capacitance ( parallel )
2k||10p kohm||pF
CRFRT RX Part Specification
In CD949 the IF backend is build around the DCT3 ASIC Plussa. Also an
additional 13 MHz filter is used. The specification of this filter is also
added into this chapter.
Table 27. AGC and 2nd mixer in PLUSSA, requirements
Parameter Min. Typ. Max. Unit/Notes
Supply voltage 2.7 2.8 2.85 V
Current consumption (VRX) 32 mA
Input frequency range 45 120 MHz
2nd IF frequency range 0.4 17 MHz
Total noise figure, SSB,
max. gain
15 dB
Total noise figure, SSB,
min. gain
65 dB
Max. voltage gain 40 dB
Min. voltage gain –17 dB
Control voltage for min. gain 0.5 V
Control voltage for max. gain 1.4 V
Output 1 dB compression
point @ max. gain
800 mVpp
Input 1 dB compression point
@ min. gain
80 mVpp
IF input impedance (bal-
anced)
2.4/tbd 3.8/2 5.6/tbd kohm/pF
2nd mixer output impedance
( single output )
100 ohm