MBC13900 데이터 시트보기 (PDF) - Motorola => Freescale

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MBC13900

NPN Silicon Low Noise Transistor

Motorola => Freescale 

Applications Information Freescale Semiconductor, Inc.

3 Applications Information

A flexible applications board topology has been developed to demonstrate the performance of the

MBC13900 at 900 and 1900 MHz. The designs are a compromise of the competing performance

requirements of gain, noise figure, input third-order intercept point (IIP3) and return losses. PCB, samples

and assembly information are available from Motorola under part number KITMBC13900/D.

3.1 900 MHz LNA

Figure 18 shows the schematic and Figure 19 shows the component placement for a 900 MHz LNA. The

design goals for the circuit are:

NF < 1.2 dB

Gain > 19 dB

Return Loss > 10 dB, input and output

Unconditional stability from 100 MHz to 6 GHz.

Typical performance that can be expected from this circuit at 3.0 and 3.5 V VCC is listed in Table 4. The

component values can be changed to enhance the performance of a particular parameter but usually at the

expense of another. Gain can be improved by sacrificing stability (R3 and R5). Input return loss can be

sacrificed to improve noise figure. IIP3 can be improved by increasing emitter degeneration (L3) and bias

current (R2). Unused traces are available on the PCB to add emitter degeneration at leads 1 and 3 of the

device.

VCC

C1

R1

R2

C4

R4

R5

L1

C3

RF In

L4

C

7

L2

R3

C2

RF Out

Figure 18. 900 MHz LNA Schematic

10

MBC13900 Technical Data

MOTOROLA

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