User's Manual

68P80801E35-B 5/1/2002 23
EBTS System Manual - Vol 2 800/900/1500 MHz Base Radios
Exciter
DIFFERENTIAL
DATA & CLOCK
FROM
BRC MODULE
ADDRESS BUS
FROM CONTROL
MODULE
SPI BUS
TO/FROM CONTROL
MODULE
ADDRESS DECODE, MEMORY, & A/D
CONVERTER CIRCUITRY
EXCITER IC CIRCUITRY
970 MHZ
VCO CIRCUITRY
SYNTHESIZER
CIRCUITRY
LINEAR RF AMPLIFIER
CIRCUITRY
LO
INJECTION
CIRCUITRY
MEMORY
A/D
CONVERTER
VARIOUS
SIGNALS
TO MONITOR
DC
FILTER
+10 V
CONTROL VOLTAGE
OSCILLATOR
CHARGE
PUMP
2.4 MHZ
VCO FEEDBACK
CHIP
SELECT
SPI BUS (CLOCK & DATA)
FROM BACKPLANE
PHASE
LOCKED
LOOP
IC
R
IN
F
IN
90.3
VCO
CIRCUITRY
OSCILLATOR
BUFFER
AMP
LNODCT IC CIRCUITRY
LNODCT IC
LOW-PASS
LOOP
FILTER
BUFFER
VCO
FEEDBACK
RF OUTPUT
TO PA MODULE
DAC
I
Q
RF FEEDBACK
FROM PA MODULE
BUFFER
AMP
BPF
REGULATOR
CIRCUITRY
+11.7 V
REGULATOR
+14.2 V
FROM
BACKPLANE
+3 V
SOURCE
+11.7 V
SOURCE
+5 V
SOURCE
+5 V
REGULATOR
+3 V
REGULATOR
(U3702)
EBTS283LN
080601JNM
NOTE: Where two frequencies are given, frequency without parentheses applies to 800 MHz BR only and frequency with parentheses applies to 900 MHz BR only.
+5.0 V FROM BACKPLANE
PLD
Figure 8 Low Noise Exciter Functional Block Diagram