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PDF LMX2216 Data sheet ( Hoja de datos )
| Número de pieza | LMX2216 | |
| Descripción | 0.1 GHz to 2.0 GHz Low Noise Amplifier/Mixer for RF Personal Communications | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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August 1995
LMX2216
0 1 GHz to 2 0 GHz Low Noise Amplifier Mixer
for RF Personal Communications
General Description
The LMX2216 is a monolithic integrated low noise amplifier
(LNA) and mixer suitable as a first stage amplifier and down-
converter for RF receiver applications The wideband oper-
ating capabilities of the LMX2216 allow it to function over
frequencies from 0 1 GHz to 2 0 GHz It is fabricated using
National Semiconductor’s ABiC IV BiCMOS process
All input and output ports of the LMX2216 are single-ended
The LNA input and output ports are designed to interface to
a 50X system The Mixer input ports are matched to 50X
The output port is matched to 200X The only external com-
ponents required are DC blocking capacitors The balanced
architecture of the LMX2216 maintains consistent operating
parameters from unit to unit since it is implemented in a
monolithic device This consistency provides manufacturers
a significant advantage since tuning procedures often
needed with discrete designs can be reduced or eliminat-
ed
The low noise amplifier produces very flat gain over the en-
tire operating range The doubly-balanced Gilbert-cell mixer
provides good LO-RF isolation and cancellation of second-
order distortion products A power down feature is imple-
mented on the LMX2216 that is especially useful for stand-
by operation common in Time Division Multiple Access
(TDMA) and Time Division Duplex (TDD) systems
The LMX2216 is available in a narrow-body 16-pin surface
mount plastic package
Features
Y Wideband RF operation from 0 1 GHz to 2 0 GHz
Y No external biasing components necessary
Y 3V operation
Y LNA input and output ports matched to 50X
Y Mixer input ports matched to 50X output port matched
to 200X
Y Doubly balanced Gilbert cell mixer (single ended input
and output)
Y Low power consumption
Y Power down feature
Y Small outline plastic surface mount package
Applications
Y Digital European Cordless Telecommunications (DECT)
Y Portable wireless communications (PCS PCN cordless)
Y Wireless local area networks (WLANs)
Y Digital cellular telephone systems
Y Other wireless communications systems
Functional Block Pin Diagram
Order Number LMX2216M
See NS Package Number M16A
TL W 11814 – 1
C1995 National Semiconductor Corporation TL W 11814
RRD-B30M115 Printed in U S A
1 page  
Typical Characteristics (Continued)
LNA (Continued)
LNA Gain vs Frequency with Supply
Voltage as a Parameter
LNA Noise Figure vs Frequency with
Supply Voltage as a Parameter
LNA Gain vs Frequency with
Temperature as a Parameter
TL W 11814 – 8
TL W 11814 – 9
LNA Noise Figure vs Frequency with
Temperature as a Parameter
TL W 11814 – 10
LNA Input Return Loss vs Frequency
with Voltage as a Parameter
TL W 11814 – 11
LNA Output Return Loss vs Frequency
with Voltage as a Parameter
TL W 11814 – 12
5
TL W 11814 – 19
5 Page 
Figures of Merit (Continued)
Due to the presence of image frequencies and the method
in which noise figure is defined noise figures can be mea-
sured and specified in two ways double side band (DSB) or
single side band (SSB) In DSB measurements the image
frequency component of the input noise source is not fil-
tered and contributes to the total output noise at the inter-
mediate frequency In SSB measurements the image fre-
quency is filtered and the output noise is not caused by this
frequency component In most mixer applications where
only one side band is wanted SSB noise figure is 3 dB
higher than DSB noise figure
In this application the LMX2216 is used in a radio receiver
front end where it amplifies the signal from the antenna and
then down converts it to an intermediate frequency The
image filter placed between the LNA and the mixer attenu-
ates the image frequency The mixer is shown to use an LO
signal generated by a PLL synthesizer but depending on
the type of application the LO signal could be generated by
a device as simple as a free-running oscillator The IF output
is then typically filtered by a channel-select filter following
the mixer and this signal can then be demodulated or go
through another down conversion depending upon the in-
termediate frequency and system requirements This exter-
nal filter rejects adjacent channels and also attenuates any
LO feed through Figure 9 shows a cascade analysis of a
typical RF front-end subsystem in which the LMX2216 is
used It includes the bandpass filter and the switch through
which the input RF signal goes in a radio system before
reaching the LNA Typical values are used for the insertion
loss of the various filters in this example
FIGURE 8 Typical Applications Circuit of the LMX2216
TL W 11814 – 18
Comp
1 Filter
2 Switch
3 LNA
4 Filter
5 Mixer
6 Filter
Data per Stage
Gain
N Fig
b2 0
20
b0 6
06
12 3 3 7
b3 0
30
5 8 13 7
b3 0
30
OIP3
100 0
100 0
60
100 0
30
100 0
Cumulative Data
Gain
N Fig
IIP3
1 b2 0
20
97 9
2 b2 6
26
96 6
3 9 7 6 3 b3 7
4 6 7 6 4 b3 7
5 12 5 9 6 b10 5
6 9 5 9 7 b10 5
System Cumulative Values
Gain
N Fig
IIP3
OIP3
9 5 dB
9 7 dB
b10 5 dBm
b1 0 dBm
FIGURE 9 Cascade Analysis Example
OIP3
95 9
94 0
60
30
20
b1 0
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LMX2216.PDF ] | |
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