LMX2216 datasheet(11/12 Pages) NSC

tên linh kiện	LMX2216

Giải thích chi tiết về linh kiện	0.1 GHz to 2.0 GHz Low Noise Amplifier/Mixer for RF Personal Communications

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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

TLW11814 – 18

FIGURE 8 Typical Applications Circuit of the LMX2216

Data per Stage

Cumulative Data

Comp

Gain

N Fig

OIP3

Gain

N Fig

IIP3

OIP3

1

Filter

b

20

1000

1

b

20

979

959

2

Switch

b

06

1000

2

b

26

966

940

3

LNA

123

37

60

3

97

63

b

37

60

4

Filter

b

30

1000

4

67

64

b

37

30

5

Mixer

58

137

30

5

125

96

b

105

20

6

Filter

b

30

1000

6

95

97

b

105

b

10

System Cumulative Values

Gain

95 dB

N Fig

97 dB

IIP3

b

105 dBm

OIP3

b

10 dBm

FIGURE 9 Cascade Analysis Example

11

Số phần tương tự - LMX2216

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Mô tả tương tự - LMX2216

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