Rainbow Electronics MAX2645 - Manual (Page 11)

MAX2645
3.4GHz to 3.8GHz SiGe
Low-Noise Amplifier/PA Predriver
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APPLICATION CIRCUIT
LNA, LOW NF
LNA, HIGH INPUT IP3
PA PREDRIVER
C1
1000pF
0.01 µF
1.5pF
Z1
1.8nH
0.75pF
0.75pF
R BIAS (k Ω)
20
20
15
V CC (V)
3.3
3.3
5.0
V CC
V CC
GAIN
RFIN
BIAS
GND
RF OUT
RF
OUTPUT
GND
GND
GND
MAX2645
SHDN
V CC
40 °
294mils
0.1 µF
0.75pF
1000pF
T LINE
L EQUIV = 1.5nH
RADIAL STUB *
* BOARD MATERIAL = GETek, COPPER THICKNESS = 1 oz
BOARD THICKNESS = 0.012in, DIELECTRIC CONSTANT = 3.8
8
8
7
9
47pF
RF INPUT
3.4GHz to 3.8GHz
1
2
3
4
5
C1
Z1
R BIAS
220pF
HIGH GAIN
LOW GAIN
ON
OFF
Figure 1. Typical Application Circuit
Figure 2. Typical System Application Block Diagram
MAX2645 MAX2645 MAX2683
MAX2684
MAX2645
MAX2645
MAX2683
MAX2684
MAX2645
LO BUFFER
LO BUFFER
TRANSMIT
IF INPUT
RECEIVE
IF OUTPUT
LO
LO
IF
BANDPASS
FILTER
RF
IMAGE-REJECT
FILTER
HIGH IP3
LNA
LOW NF
LNA
DUPLEXER
PA
PA PREDRIVER
RF
BANDPASS
FILTER