Gen eral Pu rpose MM I C : B GB 7 07 L7 ESD GPS L NA for L 2 Ba nd (1 20 0 M Hz - 12 60 M H z)

Application Note AN397

About this document Scope and purpose This application note describes Infineon’s General Purpose MMIC: BGB707L7ESD as a GPS LNA for L2 band applications. 1. This application note documents the design of a GPS band L2 LNA intended for use with a SAW prefilter. 2. The BGB707L7ESD is used in this documented design. 3. GPS receiver for L2 band is the primary application of this document. 4. This design along with AN396 provides a solution to both L1 & L2s GPS band recievers where a single type of LNA MMIC is required. 5. Key performance parameters include Gan = 18 dB, OIP3 = +11.5 dBm and OP1dB = +0.5 dBm.

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GPS LNA for L2 Band Introduction

Table of Content 1

Introduction ............................................................................................................... 4

2

BGB707L7ESD Overview .............................................................................................. 5

3

Application Circuit and Performance Overview .............................................................. 8

4

Measurement Graphs ................................................................................................ 10

5

Evaluation Board and Layout Information ................................................................... 16

6

Authors .................................................................................................................... 18

Application Note AN397

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GPS LNA for L2 Band Introduction

List of Figures1 Figure 1 Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Figure 17

BGB707L7ESD in TSLP-7-1 .................................................................................................................. 5 Equivalent Circuit of BGB707L7ESD ................................................................................................... 6 Package and pin connections of BGB707L7ESD ............................................................................... 6 Schematics of the BGB707L7ESD Application Circuit ....................................................................... 9 Gain of BGB707L7 for GPS L2 Band................................................................................................... 10 Narrow Band Gain of BGB707L7 for GPS L2 Band ............................................................................ 11 IMD3 of BGB707L7 for GPS L2 Band .................................................................................................. 11 Input P1dB of BGB707L7 for GPS L2 Band........................................................................................ 12 Input Return Loss of BGB707L7 for GPS L2 Band ............................................................................. 12 Input Return Loss Smith Chart of BGB707L7 for GPS L2 Band ........................................................ 13 Output Return Loss of BGB707L7 for GPS L2 Band .......................................................................... 13 Output Return Loss Smith Chart of BGB707L7 for GPS L2 Band ..................................................... 14 Reverse Isolation of BGB707L7 for GPS L2 Band .............................................................................. 14 Noise Figure of BGB707L7 for GPS L2 Band...................................................................................... 15 Stability of BGB707L7 for GPS L2 Band ............................................................................................ 16 Photo Picture of Evaluation Board (overview) ................................................................................. 16 Photo Picture of Evaluation Board (detailed view).......................................................................... 17 PCB Layer Information ...................................................................................................................... 17

List of Tables Table 1 Table 2 Table 3

Pin Assignment of BGB707L7ESD ....................................................................................................... 7 Electrical Characteristics (at room temperature) .............................................................................. 8 Bill-of-Materials ................................................................................................................................... 9

1) The graphs are generated with the simulation program AWR Microwave Office®.

Application Note AN397

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GPS LNA for L2 Band Introduction

1

Introduction

The GPS satellites are at an orbit altitude of more than 20,000 km away from earth’s surface and transmit power in the range of +47 dBm. After taking losses (atmospheric, antenna etc.) into account, the received signal strength at the GPS device input is very low in the range of -130 dBm. The ability of the GPS device to receive such a low signal strength and provide meaningful information to the enduser depends strongly on the noise figure of the GPS receive chain. This ability which is called receiver sensitivity can be improved by using a low-noise amplifier with low noise figure and high gain at the input of the receiver chain. The improved sensitivity results in a shorter Time-To-First-Fix (TTFF), which is the time required for a GPS receiver to acquire satellite signals and navigation data, and calculate a position. Noise figure of the LNA defines the overall noise figure of the GPS receiver system. This is where the BGB707L7ESD ( as outlined in this application note) along with a SAW filter on its input, can provide a GPS LNA with good noise figure and high gain thereby improving the receiver sensitivity significantly.

Application Note AN397

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GPS LNA for L2 Band BGB707L7ESD Overview

2

BGB707L7ESD Overview

2.1

Features



(High performance general purpose wideband MMIC LNA



ESD protection integrated for all pins (3 kV for RF input vs. GND, 2 kV for all other pin combinations, HBM)



Integrated active biasing circuit enables stable operating point against temperature and processing variations.



Excellent noise figure from Infineon´s reliable high volume SiGe:C technology



High gain and linearity at low current consumption



Supply voltage: 1.8 V to 4.0 V



Adjustable operating current 2.1 mA to 25 mA by external resistor



Power-off function



Very small and leadless package TSLP-7-1, 2.0 x 1.3 x 0.4 mm3



Pb-free (RoHS compliant) and halogen-free package



Qualification report according to AEC-Q101 available

2.2

Figure 1

BGB707L7ESD in TSLP-7-1

Key Applications of BGB707L7ESD



Mobile, portable and fixed connectivity applications: WLAN 802.11a/b/g/n, WiMax 2.5/3.5/5 GHz, UWB, WiFi, Bluetooth



Satellite communication systems: Navigation systems (GPS, Glonass), satellite radio (SDARs, DAB) and C-band LNB



Multimedia applications such as mobile/portable TV, CATV, FM Radio



3G/4G UMTS/LTE mobile phone applications



ISM applications like RKE, AMR and Zigbee, as well as for emerging wireless applications

Application Note AN397

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GPS LNA for L2 Band BGB707L7ESD Overview

2.3

Description

The BGB707L7ESD is a Silicon Germanium Carbon (SiGe:C) low noise amplifier MMIC with integrated ESD protection and active biasing. The device is as flexible as a discrete transistor and features high gain, reduced power consumption and very low distortion for a very wide range of applications. The device is based on Infineon Technologies’ cost effective SiGe:C technology and comes in a low profile TSLP-7-1 leadless green package. Please visit the product page of BGB707L7ESD for more information.

Figure 1

Equivalent Circuit of BGB707L7ESD

Figure 2

Package and pin connections of BGB707L7ESD

Application Note AN397

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GPS LNA for L2 Band BGB707L7ESD Overview

Table 1

Pin Assignment of BGB707L7ESD

Pin No.

Symbol

Function

1

Vcc

Supply voltage

2

Vbias

Bias reference voltage

3

RFin

RF input

4

RFout

RF output

5

Vctrl

On/Off control voltage

6

Adj

Current adjustment pin

7

GND

DC/RF GND

Application Note AN397

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GPS LNA for L2 Band Application Circuit and Performance Overview

3

Application Circuit and Performance Overview

In this chapter the performance of the application circuit, the schematic and bill-on-materials are presented.

3.1

Device:

BGB707L7ESD

Application:

GPS LNA

PCB Marking:

BGB7-Family v3.1

EVB Order No.:

AN397

Summary of Measurement Results

The performance of BGB707L7ESD for GPS Band L2 LNA is summarized in the following table. Table 2

Electrical Characteristics (at room temperature) Text Parameter

Symbol

Value

Unit

Frequency Range

Freq

1227

MHz

DC Voltage

Vcc

3

V

DC Current

Icc

10

mA

Gain

G

18.5

dB

Loss of input/output line of 0.1 dB included

Noise Figure

NF

1

dB

Loss of input line of 0.1 dB is deembeded

Input Return Loss

RLin

-9.5

dB

Output Return Loss

RLout

-8.9

dB

Reverse Isolation

IRev

-30

dB

Input P1dB

IP1dB

-18

dBm

Output P1dB

OP1dB

-0.5

dBm

Input IP3

IIP3

-7

dBm

Output IP3

OIP3

11.5

dBm

Stability

k

>1

--

Application Note AN397

8

Comment/Test Condition

Pin= -30 dBm, f1=1227 MHz, f2=1228 MHz Measured up to 10 GHz

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GPS LNA for L2 Band Application Circuit and Performance Overview

3.2

Schematics and Bill-of-Materials

Ther schematic of BGB707L7ESD for GPS LNA is presented in Figure 3 and its bill-of-materials is shown in Table 3.

Vcc

C4 R2 1

R3

6

L2 LNA_EN 2

C2 RFin

BGB707

5

L1

RFout 3

4

C1

R4

R1

Figure 3

Table 3

Symbol

C5

C3

Schematics of the BGB707L7ESD Application Circuit

Bill-of-Materials Value

Unit

Size

Manufacturer

R1

1.6

kΩ

0402

Any

Negative feedback

R2

820

Ω

0402

Any

Base bias

R3

51

Ω

0402

Any

Stability

R4

15

Ω

0402

Any

Stability

C1

5.6

pF

0402

KOA NPO

Input DC block

C2

1

nF

0402

KOA NPO

RF decoupling

C3

1

pF

0402

KOA NPO

RF decoupling/DC blocking

C4

1

nF

0402

KOA NPO

RF decoupling

C5

10

pF

0402

KOA NPO

Output DC block

L1

7.5

nH

0402

muRata LQG

RF chock/DC bias

L2

5.6

nH

0402

muRata LQG

RF chock/DC bias

Application Note AN397

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Comment

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GPS LNA for L2 Band Measurement Graphs

4

Measurement Graphs

The performance of the application circuit is presented with the following graphs.

Gain 30 1228 MHz 18.5 dB

20

10

0

-10 500

Figure 4

1500

2500 Frequency (MHz)

3500

4500

Gain of BGB707L7 for GPS L2 Band

Application Note AN397

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GPS LNA for L2 Band Measurement Graphs

Narrow Band Gain 30 1227.6 MHz 18.5 dB

20

10

0

-10 1150

1200

1250

1300

Frequency (MHz)

Figure 5

Narrow Band Gain of BGB707L7 for GPS L2 Band

IMD3 0 1228 -11

Power (dBm)

-20

-40 1229 -57

-60

-80

-100 1225

Figure 6

1226

1227 1228 Frequency (MHz)

1229

1230

IMD3 of BGB707L7 for GPS L2 Band

Application Note AN397

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GPS LNA for L2 Band Measurement Graphs

Input P1dB 20 -33.1 19

Gain (dBm)

15 -18 18

10

5

0 -35

Figure 7

-25

-15 Pin (dBm)

-5

0

Input P1dB of BGB707L7 for GPS L2 Band

Input Return Loss 5

0 1228 MHz -9.562 dB

-5

-10

-15 500

Figure 8

1500

2500 Frequency (MHz)

3500

4500

Input Return Loss of BGB707L7 for GPS L2 Band

Application Note AN397

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GPS LNA for L2 Band Measurement Graphs

Swp Max 4500MHz 2.

0

0.

6

0.8

1.0

Input Return Loss Smith Chart

0.

3.

0

4

4.

0

5.0

0.2 10.0

5.0

4.0

3.0

2.0

1.0

0.8

0.6

0.4

0

0.2

10.0

-10.0

2 0

0

Swp Min 500MHz

-1.0

-0.8

-0

.6

-2

.0

.0

Figure 9

-3

1228 MHz r 0.916735 x -0.670115

4

-4 .

. -0

-5.

-0.

Input Return Loss Smith Chart of BGB707L7 for GPS L2 Band

Output Return Loss 10 1228 MHz -8.897 dB

0

-10

-20

-30

-40 500

Figure 10

1500

2500 Frequency (MHz)

3500

4500

Output Return Loss of BGB707L7 for GPS L2 Band

Application Note AN397

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GPS LNA for L2 Band Measurement Graphs

Swp Max 4500MHz 2.

0

0.

6

0.8

1.0

Output Return Loss Smith Chart

0.

3.

0

4

4.

0

5.0

0.2 10.0

5.0

4.0

3.0

2.0

1.0

0.8

0.4

0.2

0

0.6

10.0

1228 MHz r 0.538354 x -0.324944

-10.0

2 0

0 .0

Figure 11

Swp Min 500MHz

-1.0

-0.8

-0

.6

-2

.0

-3

.4

-4 .

-0

-5.

-0.

Output Return Loss Smith Chart of BGB707L7 for GPS L2 Band

Reverse Isolation -10 1228 MHz -29.89 dB

-20 -30 -40 -50 -60 -70 500

Figure 12

1500

2500 Frequency (MHz)

3500

4500

Reverse Isolation of BGB707L7 for GPS L2 Band

Application Note AN397

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GPS LNA for L2 Band Measurement Graphs

Noise Figure 4

NF (dB)

3

2

1227.6 1.1

1

0 300

1300

2300

3000

Noise Figure of BGB707L7 for GPS L2 Band

Figure 13

Stability 3 2.5 2 1.5 1 0.5 0 100

Application Note AN397

2100

4100 6100 Frequency (MHz)

15

8100

10000

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GPS LNA for L2 Band Evaluation Board and Layout Information Figure 14

Stability of BGB707L7 for GPS L2 Band

5

Evaluation Board and Layout Information

In this application note, the following PCB is used: PCB Marking: BGB7-Family v3.1 PCB material: FR4 r of PCB material: 4.8

Figure 15

Photo Picture of Evaluation Board (overview)

Application Note AN397

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GPS LNA for L2 Band Evaluation Board and Layout Information

Figure 16

Photo Picture of Evaluation Board (detailed view)

Figure 17

PCB Layer Information

Application Note AN397

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GPS LNA for L2 Band Authors

6

Authors

Andrew Nelson, Application Engineer of Business Unit “RF and Protection Devices”

Revision History Major changes since the last revision Page or Reference

Description of change

Application Note AN397

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