Transmitter Rf Port Impedance Matching Network - Analog Devices ADRV9001 User Manual

Preliminary Technical Data

TRANSMITTER RF PORT IMPEDANCE MATCHING NETWORK

TX1± and TX2± Impedance Matching Network
For the TX path, the ADRV9001 evaluation board uses both the top and bottom layers of the PCB evaluation platform to accommodate
two balun footprints. The 0805 footprint accommodates the high frequency narrowband baluns while the backside accommodates the
larger AT224-1A case style transformer.
The ADRV9001 evaluation board provides two options in providing the DC common mode bias for the TX outputs. For transformers
that provide a DC feed pin, this can be used to bias the TX output. For transformers that do not provide a DC feed pin, the TX outputs
are biased to 1.8 V through pull up inductors. Only one bias option should be chosen, and provisions should be made to disable the
unused path.
The PCB traces of the evaluation board were included in the simulation when designing the impedance match. Figure 229 and Table 98
provides impedance matching networks specific to the ADRV9001 evaluation board. The component values apply to TX1± and TX2±.
Placement of C335 should be as close to dc feed pin of balun T302 as its purpose is to eliminate TX spectrum spurs and dampen the
transients. Ground terminal of C335 should be tied to a ground plane and the cap should be oriented in the same direction of ground
plane surrounding TX input trace so that the return current forms as small a loop as possible with the ground plane.
VANA2_1P8
L309
DNI
TX2_OUT–
L311 C311
DNI DNI
TX2_OUT+
RX2B_DC
L309
DNI
VANA2_1P8
IMPEDANCE CHARACTERISTICS:
Tx OUTPUTS = 50Ω DIFFERENTIAL,
BALUN = 50Ω SET TO 50Ω DIFF
NOTES
1. MATCHING COMPONENTS APPLY TO TX1± AND TX2±
Table 98. TX1± and TX2± Impedance Matching Network
Frequency Balun L/C 311
30 MHz – 3 L311:
MiniCircuits
GHz DNI
TC-1-13M+
C311:
0.3 pF
(Murata
GJM03)
3 GHz – 6 Johanson L311:
GHz DNI
4400
C311:
0.2 pF
(Murata
GJM03)
C309
DNI
AGND
L312
DNI
R367
R312
DNI
DNI
C351
DNI
3
L339 C339
L313 BAL_OUT1
DNI DNI
DNI
4
BAL_OUT2
R313 R368
GND_DC_FEED_RFGND
DNI DNI
C313
VANA2_1P8
DNI
C333 C334
10µF 0.1µF
C310
DNI
AGND
Figure 229. TX1 and TX2 Impedance Matching Network
L309 C309 L/C/R 312
L310 C310 L/C/R 313
L309/310: C309/C310 L312/313:
220 nH : 10 nF 1.2 nH
(CoilCraft (Murata AVX Ind
LQW18AN) GRM03) L0201
Series
C312/313:
DNI
R312/313:
DNI
L309/310: C309/C310 L312/313:
DNI : DNI 0.68 nH
AVX Ind
(L0201
Series)
C312/313:
DNI
R312/313:
DNI
BALUN LOCATED
ON BOTTOM
OF THE BOARD
T312
C346
TCM1-13M+
DNI
TX2_BAL–
1
SEC
3
C347 2
NC
DNI
TX2_BAL+
BALUN LOCATED
ON TOP
OF THE BOARD
0805 FOOTPRINT
1
RFO_2
T302
UNBAL_IN
DNI
GND NC_6
R368 2 5 6
0Ω
DNI
C335
0.1µF
C346/34
7
L339
R367/36
C339 8 R361
L339: C346/34
R361: DNI
DNI 7 :
C339: 330 pF
0.8 pF
(Murata
(Murata GRM03)
GJM03)
R367,
R368:
DNI
L339: C346/34 R361: 27
DNI 7: DNI nH
C339: R367/368 Murata
0.3 pF : 0 Ω Ind
(LQW18)
(Murata
GJM03)
Rev. PrC | Page 241 of 338
6
PRI
4
L348 R348 C348
L341 L315
DNI DNI DNI
DNI DNI
C315
C341
DNI
DNI
R341
R315
DNI
DNI
L314 C314
DNI DNI
C333
C334
L/C/R L/C/R
C335 341 348 L/C 314
C333: L341: L348: L314:
DNI DNI 2.2 nH DNI
C334: C341: AVX C314:
DNI DNI Ind 1pF
(L0201
C335: R341: (Murata
Series
DNI DNI GJM03)
C348:
DNI
R348:
DNI
C333: L341: L348: L314:
10uF 0.33nH DNI DNI
C334: AVX C348: C314:
0.1uF Ind DNI 0.3 pF
(L0201
C335: R348: (Murata
Series)
2.7pF DNI GJM03)
C341:
(Murata
DNI
GJM03)
R341:
DNI
UG-1828
RF OUTPUT 2
J302
AGND
L316 C316
DNI DNI
L/C/R
315 L/C 316
L315: 2.2 L316:
nH DNI
AVX Ind C316:
(L0201 DNI
Series)
C315:
DNI
R315:
DNI
L315: L316:
0.82 nH DNI
AVX Ind C316:
(L0201 DNI
Series)
C315:
DNI
R315:
DNI