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Applications Note No. 074

Silicon Discretes

A 35 dB Gain-Sloped LNB I.F. Amplifier for Direct Broadcast Satellite

Television Applications using the BGA430 & BGB540 Silicon MMICs

鈥?/div>

Gain = 32 鈥?37 dB from 950 鈥?2150 MHz (positive gain slope)

Low Power Consumption: 40mA at +5.0 Volts

Exceptionally low Noise Figure: less than 3 dB

Low Cost, Low Parts Count

High Reverse Isolation

Output Compression point: +1 dBm minimum

(May be increased with higher DC bias level)

Suitable for European, Asian & North American DBS

LNB I.F. Amplifier Chains for 950 鈥?1450 and 950 鈥?2150 MHz

1. Overview

Infineon鈥檚

BGA430 Broad Band High Gain

Low Noise Amplifier

and

BGB540 Active

Biased Transistor

are shown in an

Intermediate-Frequency

(鈥淚.F.鈥?

amplifier

application targeted for the I.F. chains of

European, Asian and North American Direct-

Broadcast Satellite (DBS) Low Noise Block

Amplifier / Downconverters (LNBs).

A summary of key performance parameters for

the complete LNB I.F. Amplifier is given in

Table

1

to the right.

The reader is referred to

Appendix A

on page 21 for complete electrical

data including minimum, maximum, mean value,

and standard deviation for the lot of Printed

Circuit Boards (PCBs) tested.

Appendix B

on

page 22 gives information on performance over

the 鈥?0 to +85 擄C temperature range.

Section 2

of this applications note provides a

brief description of the BGA430 and BGB540

MMICs.

Section 3

gives some general Direct

Broadcast Satellite system information, and is

included to provide a general background.

Section 4

provides details on the PC Board

used, including photos, a Bill of Material (BOM)

and a PCB cross-sectional diagram.

Section 5

describes using the BGA430 MMIC as a stand-

alone DBS I.F. Amplifier block, and covers

design issues unique to BGA430.

Section 6

addresses the question 鈥渨hy might one want a

positive gain slope I.F. Amplifier鈥?and

Section 7

gives measurement results on the complete

gain-sloped amplifier using both BGA430 &

BGB540.

Table 1.

complete

Amplifier.

Typical performance for the

BGA430+BGB540

LNB

I.F.

Conditions: Temperature=25擄C, V=5.0 Volts, n=25 units,

Z

S

=Z

L

=50鈩? network analyzer source power = -40 dBm

Parameter

Input Return Loss, dB

Gain, dB

Reverse Isolation, dB

Output Return Loss, dB

Noise Figure, dB

Output P

1dB

, dBm

Input IP

3

, dBm

Frequency, MHz

950

1450

2150

26.0

27.3

12.0

33.0

37.2

>50

13.7

13.4

13.1

2.4

2.6

+1.7

+4.9

+7.9

-20.8

-22.5

-18.9

Please note that the reference planes for all

measurement data shown in

Table 1

are at the

PC board鈥檚 SMA RF connectors; e.g. no PCB

loss is extracted from the numbers given.

1 / 24

19-November-2002

AN 074 Rev E

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