INFINEON BGA622 User Manual

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Silicon Discretes

The BGA622 Silicon-Germanium
Universal Low Noise Amplifier MMIC
in 1800 - 2500 MHz Receiver Applications

Features

• Versatile, easy-to-use LNA MMIC
in 70 GHz

•50Ω matched output, pre-matched input

• Integrated output DC blocking capacitor,
integrated RF choke on internal bias network

• Low current consumption of 6 mA

• “Shutdown” or “Sleep” mode

• Unconditionally stable

• Low external component count

• Exceptional noise figure: 1.1 dB in a PC board at 2 GHz

f

SiGe technology

t

Application Note No. 069

3

4

SOT-343

2

1

Applications

• Low Noise Amplifier for 800/900 MHz, GSM900, 900 MHz ISM, DCS1800, GPS,
1900 MHz PCS, 2.1 GHz UMTS and 2.4 GHz Wireless LAN

• Long-Range Bluetooth applications requiring improved system sensitivity via use of
an external LNA

Introduction
The BGA622 is an easy-to-use, versatile and flexible low-cost Low Noise Amplifier

(LNA) MMIC designed for the high linearity and sensitivity requirements of existing and

next - generation wireless applications including GSM, 900 MHz ISM, GPS, UMTS and
Wireless LANs. Based on Infineon’s cost-effective 70 GHz

f

Silicon-Germanium (SiGe)

T

B7HF bipolar process technology, the BGA622 offers a 1.1 dB noise figure and 15 dB of
gain at 2.1 GHz for high performance, cost-effective mobile communications
applications. BGA622 offers impressive noise figure performance, particularly for a low­cost, integrated MMIC. In the past, in-circuit noise figures approaching 1.0 dB at 2 GHz
were possible only for more expensive GaAs-based, fully discrete solutions utilizing
narrowband impedance matching and higher external parts count. The BGA622
combines the excellent noise figure advantages of a high-performance discrete solution
with the ease-of-use, low parts count, and diminished risk and reduced system
development time made possible by a MMIC approach.

Application Note 1 V3.0, 2001-10

The BGA622 Silicon-Germanium Universal Low Noise

Amplifier MMIC in 1800 - 2500 MHz Receiver Applications

Introduction

The new LNA incorporates a 50 Ω matched output with an integrated output DC blocking
capacitor. The broadband output match simplifies integration issues with external image­stripping filters. The input is pre-matched, requiring an external DC blocking capacitor.
An integrated, on-chip inductor eliminates the need for an external RF choke on the
voltage supply pin. The noise figure of BGA622 is relatively insensitive to the input
impedance matching approach taken by the end user, reducing development time and
risk. A low supply current of 6 mA at 2.75 V and an integrated on/off feature provides for
low power consumption and increased stand by time for 3G cellular handsets or other
portable, battery-operated wireless applications.

Vcc,4

In,1

On/Off

GND,2

Figure 1 BGA622’s Equivalent Circuit

In, 1 4, Vcc

GND, 2 3, Out

Top View

Figure 2 Pin Connections

10k

Out,3

Ω

Application Note 2 V3.0, 2001-10

The BGA622 Silicon-Germanium Universal Low Noise

Amplifier MMIC in 1800 - 2500 MHz Receiver Applications

Overview

Overview

The BGA622 is shown in three different configurations for the frequency band between
1700 MHz and 2500 MHz which covers the PCN/PCS, UMTS and BlueTooth
frequencies at 1800 / 1900 MHz, 2.14 GHz and 2.4 GHz:

• Configuration A: minimum parts count, power down option is not used

• Configuration B: BGA622 with power down option

• Configuration C: BGA622 with power down option and increased IIP

3

The following table shows the measured performance of these three circuits. All
measurement values presented in this application note include losses of both PCB and
connectors - in other words, the reference planes used for measurements are the PCB’s
RF SMA connectors. Noise figure and gain results shown do not have any PCB loss
extracted from them.

Performance Overview
Parameter Configuration A Configuration B Configuration C

Supply voltage 2.75 V 2.75 V 2.75 V
Supply current 5.5 mA 5.4 mA 5.4 mA
Gain 14.8 dB @ 1.85 GHz

13.8 dB @ 2.14 GHz

12.6 dB @ 2.4 GHz

Noise Figure 1.2 dB @ 1.85 GHz

1.25 dB @ 2.14 GHz

1.3 dB @ 2.4 GHz

Input return loss 11.1 dB @ 1.85 GHz

12.5 dB @ 2.14 GHz

11.6 dB @ 2.4 GHz

Output return loss 12.4 dB @ 1.85 GHz

12.5 dB @ 2.14 GHz

12.8 dB @ 2.4 GHz

Reverse Isolation 26.1 dB @ 1.85 GHz

24.8 dB @ 2.14 GHz

23.8 dB @ 2.4 GHz

Input compression

1)

point
Input 3

intercept point

rd

order

2)

-15 dBm -16 dBm -15 dBm

-7.1 dBm @ 1.8 GHz

-5.5 dBm @ 2.14 GHz

-3.9 dBm @ 2.4 GHz

1)

Measured at 2.14 GHz

2)

-30 dBm per tone, ∆f = 1 MHz

14.5 dB @ 1.85 GHz

13.5 dB @ 2.14 GHz

12.5 dB @ 2.4 GHz

1.2 dB @ 1.85 GHz

1.2 dB @ 2.14 GHz

1.35 dB @ 2.4 GHz

11.9 dB @ 1.85 GHz

12.3 dB @ 2.14 GHz

11.2 dB @ 2.4 GHz

12.2 dB @ 1.85 GHz

11.4 dB @ 2.14 GHz

11.0 dB @ 2.4 GHz

26.3 dB @ 1.85 GHz

25.0 dB @ 2.14 GHz

24.0 dB @ 2.4 GHz

-6.6 dBm @ 1.8 GHz

-4.0 dBm @ 2.14 GHz

-3.9 dBm @ 2.4 GHz

14.6 dB @ 1.85 GHz

13.5 dB @ 2.14 GHz

12.5 dB @ 2.4 GHz

1.2 dB @ 1.85 GHz

1.25 dB @ 2.14 GHz

1.3 dB @ 2.4 GHz

14.1 dB @ 1.85 GHz

13.1 dB @ 2.14 GHz

11.1 dB @ 2.4 GHz

11.7 dB @ 1.85 GHz

11.3 dB @ 2.14 GHz

11.0 dB @ 2.4 GHz

26.2 dB @ 1.85 GHz

25.0 dB @ 2.14 GHz

24.1 dB @ 2.4 GHz

4.7 dBm @ 1.8 GHz

4.4 dBm @ 2.14 GHz

4.3 dBm @ 2.4 GHz

Application Note 3 V3.0, 2001-10

The BGA622 Silicon-Germanium Universal Low Noise

Amplifier MMIC in 1800 - 2500 MHz Receiver Applications

Configuration A

Configuration A

The circuit in Figure 3 shows the minimum parts count version of a BGA622 LNA. There
are only three external elements necessary. A DC blocking capacitor at the output and
a coil at the power supply are already integrated on chip

Vcc

C3

47pF

In

L1

2.2nH

C1

47pF

1

BGA622

2

4

Q1

Out

3

Figure 3 Circuit Diagram of Configuration A

Bill of Materials of Configuration A
Name Value Package Manufacturer Function

C
C
L

1

3

1

47 pF 0402 various DC block
47 pF 0402 various RF bypass

2.2 nH 0402 Toko LL1005-FH Input matching

Q1 BGA622 SOT-343 Infineon Technologies SiGe MMIC

For measurement graphs of configuration A please refer to the next pages.

Application Note 4 V3.0, 2001-10

The BGA622 Silicon-Germanium Universal Low Noise

Amplifier MMIC in 1800 - 2500 MHz Receiver Applications

2

1,8

1,6

1,4

1,2

1

Noise Figure [dB]

0,8

0,6

1,7 1,9 2,1 2,3 2,5

Frequency [GHz]

Configuration A

Figure 4 Noise Figure Configuration A

16

15

14

13

Gain [dB]

12

11

10

1,7 1,9 2,1 2,3 2,5

Frequency [GHz]

Figure 5 Gain Configuration A

Application Note 5 V3.0, 2001-10

The BGA622 Silicon-Germanium Universal Low Noise

Amplifier MMIC in 1800 - 2500 MHz Receiver Applications

6

8

10

12

Return Loss [dB]

14

16

1,7 1,9 2,1 2,3 2,5

s11

s22

Frequency [GHz]

Configuration A

Figure 6 Return Loss Configuration A

20

22

24

26

Reverse Isolation [dB]

28

1,7 1,9 2,1 2,3 2,5

Frequeny [GHz]

Figure 7 Reverse Isolation Configuration A

Application Note 6 V3.0, 2001-10

The BGA622 Silicon-Germanium Universal Low Noise

Amplifier MMIC in 1800 - 2500 MHz Receiver Applications

5

4

3

K

K, B1

2

B1

1

0

0123456

Frequency [GHz]

Configuration A

Figure 8 Stability Factor K and Stability Measure B1 of Configuration A

20
18
16
14
12
10

8

Gain [dB]

6
4
2
0

0123456

Frequency [GHz]

Figure 9 Wide Span Gain Configuration A

Application Note 7 V3.0, 2001-10