MBC13917EP Ver la hoja de datos (PDF) - Freescale Semiconductor

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MBC13917EP

General Purpose SiGe:C RF Cascode Low Noise Amplifier

Freescale Semiconductor 

Application Circuits

4 Application Circuits

The MBC13917 LNA is designed for applications in the 100 MHz to 2.5 GHz range. In the application

examples included in this section, a balance is made between competing RF performance characteristics

of Icc, NF, gain IP3, and return losses to demonstrate overall performance. Conjugate matching is not used

for the input or output.

Instead, matching that achieves a tradeoff in RF performance qualities is shown. For a particular

application or specification requirement, the matching can be changed to achieve enhanced performance

of one parameter (generally at the expense of other parameters). Application information for 350 MHz,

434 MHz, 900 MHz and 1900 MHz circuits is provided.

• Section 3, “Scattering and Noise Parameters” provides Smith charts with gain and noise circles for

each application frequency.

• Section 5, “Printed Circuit Board and Bill of Materials” provides the evaluation board layout and

Bill of Material for the circuits.

4.1 350 MHz–370 MHz Applications

This application circuit was designed to provide NF = 2.1 dB, S21 gain > 27 dB for 350 MHz. Return

losses and gain are similar for 350 MHz–370 MHz.

• Component C4 has the greatest impact on return losses, NF, and gain, by moving the input and

output on the Smith chart.

• Component L1 can be lowered to improve NF, by trading off S11 return loss.

• Gain, OIP3 and P1dBoutput can be increased, by decreasing the resistor value at the output

(without impacting NF or return losses).

This application is intended for a range of designs, including TETRA land mobile and base station

transceivers. Typical performance that can be expected from this circuit at 2.7V is listed in Table 10.

Figure 16 is the 350 MHz–370 MHz application schematic with package pinouts and the circuit

component topology.

Vcc

RF IN

C1

47 pF

L1

39 nH

1

Gnd

L2

6

47 nH

C2

C3

100 pF .1uF

2

Gnd

NC 3

5

R1

24 ohm

C4

2.4 pF

4 NC

.

C5

3 pF

RF

OUT

Figure 16. 350 MHz–370 MHz Application Schematic

MBC13917 Advance Information, Rev. 1.0

24

Freescale Semiconductor

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