CIRCUIT DESCRIPTION
5-8
Figure 5-3 700/800 MHz RF Board Block Diagram
PLL
16.8 MHz TCXO
IF Am p
MMBR941
Antenna
Jac k
Harmonic
Filter
Receiver Back End
8 ch
8 bit
DAC
1Kbit
EEPROM
Power Control
SPI
High Frequency Modulation
AD9864
RX Band Select
64.455 MHz
15 KHz BW
Fif = 2.1MHz
62.355 MHz
I
L
R
MIXER
ADEX-10L
LO
BPF
762 - 776 MHz
1
C
2
1
C
2
851 - 870 MHz
Bandpas s
Filters
1
C
2
D0
T/R Switch
RF Out
SPI
SPI
TX VCO
762 - 870 MHz
SPI
LNA
RF2361
Switc h
Switc h
LNA Bypass
1
C
2
Switc h
1
C
2
Switc h
1
C
2
Switc h
1
C
2
Switc h
PA
Mitsubishi RA03M
DRIVER
Sirenza SGA 6589
RX VCO
826 - 841 MHz
RX VCO
786 - 806 MHz
Low Frequency Modulation
RF / Logic
Interface
SPI Addr
SPI
RF Out
1
20
19
18
15
14
13
12
11
10
9
8
7
6
5
4
3
2
SPI
MISO
SPI
MOSI
SPI
Clk
SPI
Addr1
SPI
Addr2
RF
Clk
RF
Data
RF
Frame
Sync
nTxEna
T xMod2
nTxNap
Temp
Lock
Detect
T xMod1
Lock
Enable
Unsw
Batt
3.3V
5.5V
SPI
Addr3
RX Filter Tuning
RX LO Filter Tuning
RX LNA Bypass
TX Pwr Control
Varacter-Tuned
Bandpass Filter
U11
Q1
U2
MX1
U7
U8
U37
U33
U28
U4
U20
U3
U1
U29
U19
Y1
U5
U6
U24
U32
U31
(Digital IF)
5.4 700/800 MHz RF BOARD (VERSION C)
NOTE: The following describes the new revised
Version C RF board described in Section 1.13.1. The
RF Board is not field serviceable. It must be replaced
as a unit with a new board.
5.4.1 RECEIVER
Front End Bandpass Filter
A varactor-tuned bandpass filter (including W3
and W4) is used in the front-end of the receiver. This
filter provides first-image rejection with minimal loss
to provide the desired level of receiver sensitivity. The
front-end bandpass filter center frequency is tuned via
voltages from an 8-channel D/A converter. Ceramic
resonators provide a high circuit Q and lower loss than
a fixed inductor. A back-to-back varactor diode
configuration increases the circuit's third-order inter-
cept point.
Front End LNA and Bypass Switching
Low Noise Amplifier (LNA) U33 is critical in
determining the overall noise figure of the receiver.
The RF2361 amplifier provides a good noise figure,
gain, intercept point and power consumption. RF
switches U28 and U37 bypass the signal around the
LNA when required to increase the effective third-
order intercept point and the interference rejection
capabilities of the receiver.
Post-LNA Bandpass Filters
Additional bandpass filters are used after the
LNA. These filters are fixed-tuned since varactor-
tuned filters would have an excessive third-order inter-
cept point. One filter bank is tuned to the 700 MHz
receive band and the other bank to the 800 MHz
receive band. RF switches U8 and U7 select the
desired band. These filters have better selectivity and
more loss than the front-end filters, but the gain of the
700/800 MHz RF BOARD (VERSION C)
Содержание 5100 Series
Страница 76: ...PARTS LIST 7 20 MP032 MP030 A200 Part of A200 Part of A200 MP031 MP033 MP034 A100 A030 EP031 J4 J3 EP030 6 ...
Страница 85: ...8 9 Version C Board see Section 1 13 VHF RF BOARD VER C LAYOUT ...
Страница 87: ...8 11 VHF RF BOARD SCHEMATIC VER B PAGE 2 OF 3 ...
Страница 88: ...8 12 VHF RF BOARD SCHEMATIC VER B PAGE 3 OF 3 ...
Страница 95: ...8 19 BOTTOM VIEW TOP VIEW Version C Board see Section 1 13 UHF RF BOARD VER C LAYOUT ...
Страница 105: ...8 29 BOTTOM VIEW TOP VIEW 700 800 MHZ RF BOARD VER C LAYOUT Version C Board see Section 1 13 ...
Страница 112: ...8 36 SEM Module 5500 120 LOGIC BOARD VER C SCHEMATIC PAGE 5 OF 11 ...
Страница 113: ...8 37 Analog Switch 5500 120 LOGIC BOARD VER C SCHEMATIC PAGE 6 OF 11 ...
Страница 118: ...8 42 5500 120 LOGIC BOARD VER C LAYOUT BOTTOM VIEW TOP VIEW Version C Board see Section 1 13 ...
Страница 127: ...8 51 5100 160 LOGIC BOARD VER B TOP VIEW 5100 160 LOGIC BOARD VER B BOTTOM VIEW Version with Motorola UCM ...
Страница 143: ...8 67 5500 420 USER INTERFACE BOARD VER C TOP VIEW Version C Board see Section 1 13 ...
Страница 144: ...8 68 5500 420 USER INTERFACE BOARD VER C BOTTOM VIEW ...
Страница 147: ...8 71 5100 410 USER INTERFACE BOARD VER A TOP VIEW Version w o encryption module Version A Board see Section 1 13 ...
Страница 148: ...8 72 5100 410 USER INTERFACE BOARD VER A BOTTOM VIEW Version w o encryption module ...
Страница 151: ...8 75 5100 450 USER INTERFACE BOARD VER B TOP VIEW Version with EFJ SEM Version B Board see Section 1 13 ...
Страница 152: ...8 76 5100 450 USER INTERFACE BOARD VER B BOTTOM VIEW Version with EFJ SEM ...
Страница 155: ...8 79 5100 460 USER INTERFACE BOARD VER B TOP VIEW Version with Motorola UCM Version B Board see Section 1 13 ...
Страница 156: ...8 80 5100 460 USER INTERFACE BOARD VER B BOTTOM VIEW Version with Motorola UCM ...
Страница 171: ...9 14 OBSOLETE VERSION 5100 410 USER INTERFACE BOARD VER A TOP VIEW Version A Board see Section 1 13 Revision 6 Board ...
Страница 172: ...9 15 OBSOLETE VERSION 5100 410 USER INTERFACE BOARD VER A BOTTOM VIEW Revision 6 Board ...
Страница 173: ...Part Number 001 5100 0017CD 12 04hph Printed in U S A ...