Frequency Synthesizers - Nokia RH-41 Series Technical Documentation Manual

RH-41
System Module
Parameter
Conversion gain @ RI=1kohm
IF AGC gain range (5x6 dB)
IF AGC gain step (5 steps)
IF AGC gain error relative to max
gain
AMP2 gain
-3dB frequency
LPF: 4th order Chebysev
LPF gain
Corner frequency tuning range
Corner frequency tuning step
Attentuation @ 30 kHz *
Attentuation @ 60 kHz *
Attentuation @ 120 kHz *
Attentuation @ 240 kHz *
Attentuation @ >480 kHz *
AGC
AGC gain range
AGC gain range step
7 steps
AGC gain error relative to max gain
Max IF/2nd IF buffer output level

Frequency Synthesizers

RH-41 synthesizer consists of three synthesizers: one UHF synthesizer and two VHF syn-
thesizers. UHF synthesizer is based on integrated PLL and external UHF VCO, loop filter,
and VCTCXO. Its main goal is to achieve the channel selection, thus for dual band opera-
tions associated with dual mode. Due to the RX and TX architecture this UHF synthesizer
is used for down-conversion of the received signal and for final up-conversion in trans-
mitter. A common 2 GHz UHFVCO module is used for operation on both low- and high-
band. Frequency divider by two is integrated in Taco.
Two VHF synthesizers consist of: RX VHF Synthesizer, includes integrated PLL and VCO,
and external loop filter and resonator. The output of RX-VHF PLL is used as LO signal for
the second mixer in receiver. TX VHF Synthesizer includes integrated PLL, loop filter, and
resonator. The output of TX-VHF PLL is used as a LO signal for the IQ-modulator of the
transmitter. See depicted block diagrams and synthesizer characteristics from synthesizer
Page 48
Minimum
23.5
30
-0.5
21
14
24
55
80
60
40
-6
-0.5
Nokia Corporation
CCS Technical Documentation
Typical/
Maximum
Nominal
24 24.5
6
+0.5
18
25 29
0
17
1
36**
6
+0.5
3
Confidential
Unit/Notes
dB
dB
dB
dB
dB
kHz
dB
kHz
kHz
dB
dB
dB
dB
dB
dB
dB
dB
V pp (differential)
Issue 2 09/2003