Motorola APX 2000 - Page 925

Schematics, Boards Overlays, and Parts Lists: Transceiver (RF) Boards: UHF1 (84012620001) 8-94
Figure 8-33. Receiver Front End Circuit
1
IF1901M20
ANA_RX_FE_TUNE
IN
R1910M20
IF1903M20
IF1902M20
1
1
IN
IN
CTRL_RX_UHF1_LNA_A = 3V (HIGH), LNA'S TURN ON
R1906M20
C1926M20 C1925M20
DIG_CTRL_RXU
DC_LIN_1_8V_A
VR1905M20
C1929M20
L1908M20
C1928M20
C1952M20
VR1906M20
L1910M20
L1909M20
2121
Q1920M20
R1907M20
C1953M20
2
1
22K
22K
R1925M20
C1924M20
C1923M20
R1924M20R1923M20
Q1922M20
Q1922M20
E1921M20
R1921M20
R1922M20
DC_RX_UHF1_LNA_C_13A
ANA_RX_FE_TUNE
DC_RX_FE_UHF1_LNA_B_13A
CTRL_RX_FE_UHF1_LNA_B_13A
DC_RX_UHF1_LNA_D_13A
DC_RX_UHF1_LNA_A_13A
6
43
5
1
2
21
3
IN
R1908M20
C1955M20
C1954M20
R1911M20
VR1907M20
VR1908M20
L1913M20
C1964M20
C1963M20
L1914M20
L1912M20
C1957M20
C1956M20
R1909M20
2121
C1920M20
L1936M20
C1940M20
R1935M20
U1932M20
L1934M20
C1922M20
C1901M20
R1972M20
C1971M20
R1970M20
C1970M20
L1935M20
R1936M20
C1936M20
C1931M20
RF_RX_FE_UHF1_LNA_E_13A
RF_RX_FE_UHF1_LNA_C_13A
23
1
POSTFILTER MODIFIED XTS5000
C1959M20
C1961M20
C1960M20
C1942M20
L1917M20
C1900M20
R1900M20
L1900M20
IF1904M20
C1932M20
C1903M20
C1930M20
L1901M20
RF_RX_UHF1_FE_OUT
1
21
OUT
IF1900M20
TL_RX_UHF1_FE_IN
1
IN
PREFILTER MODIFIED XTS5000
C1935M20
C1939M20
C1958M20
L1915M20
C1938M20
D1970M20
2
3
1