Figure 3-54. Gps Block Diagram (Uhf1/700-800 Mhz,Uhf1/Vhf, Uhf1/Uhf2, Uhf2/700-800 Mhz, And Uhf2/Vhf) - Expander Board Mhln6977 - Motorola APX 7000 Detailed Service Manual

Theory of Operation
: Global Positioning System (GPS)
.
RF Board
Ant
3.0V
Unbalanced
LNA
SAW
Figure 3-56. GPS Block Diagram (UHF1/700–800 MHz,UHF1/VHF, UHF1/UHF2, UHF2/700–800 MHz, and
.
RF Board
Ant
3.0V
Unbalanced
LNA
SAW
Figure 3-57. GPS Block Diagram (VHF/700–800 MHz, UHF1/700–800 MHz,UHF2/700–800 MHz, UHF1/VHF,
RF-Vocon-Exp
Interconnect
3.6V
(VSW_3.6)
GPS_2.8V
Unbalanced
LNA
SAW
UHF2/VHF) – Expander Board MHLN6977
RF-Vocon-Exp
Interconnect
Unbalanced
LNA
SAW
UHF2/VHF, and UHF1/UHF2) – Expander Board MHLN7035A
External Regulators
2.8V 1.8V
RF Vcc I/O Vcc Core Vdd
LNA Enable
FDOUT
(H1)
RFA_INP
(A5)
RFA_INM
(B5)
GPS IC
Balanced
SiRF GSCi-5001
SAW
External Regulators
3.6V
2.8V
(VSW_36)
VBAT1
LNA Enable
GPS_EXT_LNA_EN
GPS IC
TI NL5500
Balanced
SAW
GPS_N_SHUTDOWN
Expansion Board
1.2V
REF_CLK_IN
(D4)
MISO_TXD0
GPS Tx
(J6)
GPS Rx
MOSI_RXD0
(K6)
LOW_REF_CLKI 32kHz RTC
(D1)
Reset
NRESET
(C1)
Expansion Board
1.8V
VDD
TCXO_CLK_LV
GPS_UART_TX
GPS Tx
GPS Rx
GPS_UART_RX
RTC_CLK 32kHz RTC
Reset
3-73
GPS_2.8V
TCXO
26MHz
<0.5ppm
[OMAP 1710]
UART2_Rx
(R9)
UART2_Tx
(M18)
IO74
(E2)
IO91
(D12)
TCXO
26MHz
<0.5ppm
[OMAP 1710]
UART2_Rx
(R9)
UART2_Tx
(M18)
IO74
(E2)
IO91
(D12)