100 – 1000 MHz; Ultra Wideband Variable Gain Amplifier100 – 1000 MHz; Ultra Wideband Variable...

SKY65142 Data Sheet Skyworks - Preliminary

SKY65142 - Preliminary Data Sheet 100 – 1000 MHz; Ultra Wideband Variable Gain Amplifier

Description

Skyworks SKY65142 is an ultra-wideband Variable Gain Amplifier (VGA) in a small footprint module. The module contains a Variable Voltage Attenuator with Gain control range of over 20 dB. The device is internally matched for 50 Ohms on all RF ports.

The VGA maintains very linear performance over a wide frequency bandwidth with P1dB greater than 27 dBm, and OIP3 greater than 35 dBm.

ESD Sensitivity

The SKY65142 is a static-sensitive electronic device. Do not operate or store near strong electrostatic fields. Take proper ESD precautions.

Electrical and Mechanical Specifications

The signal pin assignments and functions are described in Table 1. The absolute maximum ratings for the SKY65142 are provided in Table 2. The recommended operating conditions for the SKY65142 are specified in Table 3. The remaining tables and figures illustrate the device performance at various operating bands.

Figure 1. SKY65142 Pinout – 8x8mm MCM Package

Features

• Wideband Frequency Operation: 100 MHz – 1000 MHz. • Gain Control Range: 20 dB • Gain at Zero Attenuation: 20 dB • Linear Output Power > +27 dBm • Output IP3 > 35 dBm • Single DC Supply: +5V • Low Power Consumption, PAE > 40% • Low Cost Lead Free SMT Package

Applications

• AMPS / PCS / DCS / GSM / EDGE / GPRS • VHF / UHF TV / Tetra • Base Stations • Repeaters

Figure 2. SKY65142 Functional Block Diagram

Proprietary Information and Specifications Are Subject to Change August 17, 2006

<SKY65142> <Wideband Linear Variable Gain Amplifier >

Table 1. SKY65142 Pin Out Description

Skyworks - Preliminary

Table 2. SKY65142 Absolute Maximum Ratings

Parameter Symbol Min. Typical Max. Units RF Output power Pout +29 dBm

Supply voltages Vcc, Bias, Vref, Vcnt, V_Att

5.5 V

Power dissipation PD 2000 mW

Case Operating temperature Tc -40 +85 oC

Storage temperature Tst -55 +125 oC

Junction temperature Tj +150 oC

Note: Exposure to maximum rating conditions for extended periods may reduce device reliability. There is no damage to device if only one parameter is set at the limit and all other parameters set at or below their nominal conditions.

Table 3. SKY65142 Recommended Operating Conditions

Parameter Symbol Min Typical Max Units

Supply voltages Vcc, Bias, Vref, V_Att 4.75 5.0 5.25 V

Gain Control voltage Vcnt 0 5.0 V

Frequency Range F 150 950 MHz

Pin Number Name Description1 GND Ground 2 RFin RF Input 3 GND Ground 4 Bias Amplifier Bias Voltage 5 Vref Reference Voltage 6 Vcc Collector Supply Voltage 7 GND Ground 8 RFout RF Output 9 GND Ground

10 GND Ground 11 Vcnt Gain Control Voltage 12 V_Att Attenuator Circuit Bias Voltage

2 SKY65142 Proprietary Information and Specifications Are Subject to Change August 17, 2006

Table 4. SKY65142 Electrical Characteristics

( Vcc = Vref = V_Att = Bias = 5 V, Vcnt = 0V, Tc = +25 oC, unless otherwise noted)

Parameter Symbol Test Condition Min Typical Max Units

Test Frequency = 150 MHz

Gain at minimum Attenuation Gmax CW 24 dB

Gain Control Range Grange CW 23 dB

Output Power at 1 dB P1dB CW 29 dBm

PAE at P1dB PAE CW 50 %

Output 3rd. Order Intercept Point OIP3 2 tones, 5 dBm/ Output

Tone, 1 MHz separation 36 dBm















SKY65142 3 August 17, 2006 Proprietary Information and Specifications Are Subject to Change


Gain (dB) vs. Frequency

10

15

20

25

30

100 200 300 400 500 600 700 800 900 1000 1100

Frequency (MHz)

Gai

n (d

B)

Figure 3. Gain (Minimum Attenuation) vs. Frequency

SKY65142Gain vs. Vcon over Frequency

-5

0

5

10

15

20

25

30

0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0Vcon(V)

Gai

n(dB

)

156MHz

453MHz

908MHz

Figure 4. Gain vs. Vcon vs. Frequency


Skyworks – Preliminary

Output P1dB vs. Frequency

25

26

27

28

29

30

100 200 300 400 500 600 700 800 900 1000

Frequency (MHz)

Out

put P

1dB

(dB

m)

Figure 5. Output P1dB vs Frequency.

PAE vs. Frequency

35

40

45

50

55

100 200 300 400 500 600 700 800 900 1000

Frequency (MHz)

PAE

(%)

Figure 6. Power Added Efficiency (PAE) vs. Frequency



OIP3 vs. Attenuation

32

34

36

38

40

42

0 2.5 5 7.5 10 12.5 15 17.5 20

Attenuation level (dB)

OIP

3 (d

Bm

)156MHz450MHz905MHz

Figure 7. Typical OIP3 vs. Attenuation Value vs. Frequency.



Evaluation Board Description Skyworks SKY65142 Evaluation Board is used to test the performance of the VGA. The Evaluation Board schematic diagram is shown in Figure 8. The schematic shows the basic design of the board for the 100 to 1000 MHz range. An assembly drawing for the Evaluation Board is shown in Figure 9. Circuit Design Considerations The following design considerations are general in nature and must be followed regardless of final use or configuration 1. Paths to ground should be made as short as possible. 2. The ground pad at the bottom of the module has special electrical and thermal grounding requirements. This pad is the main thermal conduit for heat dissipation. Since the circuit board acts as the heat sink, it must shunt as much heat as possible from the module. As such, design the connection to the ground pad to dissipate the maximum wattage produced by the module to the circuit board. Multiple vias to the grounding layer are required. 3. Bypass capacitors should be used on the DC supply lines. RF inductor is required on the Vcc supply line to block RF signal from the DC supply. See Evaluation Board schematic drawing for more details. 4. The RF lines should be well separated from each other, with solid ground in between traces, to maximize input-to-output isolation.

Testing Procedure Use the following procedure to set up the SKY65142 Evaluation Board for testing. 1. Connect +5.0 V DC supply voltages to Bias, and Vref. If available, enable the current limiting function of these power supplies to 0.1 A. 2. Connect a +5.0 V to the Attenuators supply voltages, V_Att and Vcnt. If available, enable the current limiting function of the power supply to 0.05 A. 3. Connect a +5.0 V to the Amplifier supply voltage, Vcc. If available, enable the current limiting function of the power supply to 0.5 A. 4. Connect signal generator(s) to the required RF input port. Set the desired RF signal frequency. Set RF power level to 8 dBm or less to the Evaluation Board but do NOT enable the RF signal. 5. Set the required Attenuation by adjusting the voltage level on Vcnt supply lines. 6. Enable the RF signal. 7. Take measurements. CAUTION: If the input signal exceeds the rated power, the SKY65142 Evaluation Board can be permanently damaged.




J2

SMA

V_Att

L168 nH

VCCBIAS

C8

DNI

C9

100 pF

C10

0.01uF

C11

0.01uFC14

1 uF

C15

1uF

Vcnt

VREF

C7

DNI

C12

DNIC13

DNI

11

RFIN2

33

BIA

S4

RE

F5

VC

C6

GND13

9 9

RFOUT8

77

V_C

TR

L11

V_A

TT

12

1010J6

SP00-D311_m4

J1

SMA

Figure 8. Evaluation Board Schematic.


Figure 9. Evaluation Board Drawing.



Figure 10. SKY65142 Package Details.



Ordering Information

Model Name Ordering Part Number Evaluation Kit Part Number SKY65142 , 100 - 1000 MHz VGA SKY65142 TW13-D965-0037



Copyright © 2006, Skyworks Solutions, Inc. All Rights Reserved

Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products. These materials are provided by Skyworks as a service to its cusomters and may be used for informational purposes only. Skyworks assumes no responsibility for errors or omissions in these materials. Skyworks may make changes to its products, specifications and product descriptions at any time, without notice. Skyworks makes no commitment to update the information and shall have no responsibility whatsoever for conflicts, incompatibilities, or other difficulties arising from future changes to its products and product descriptions.

No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as may be provided in Skyworks’ Terms and Conditions of Sale for such products, Skyworks assumes no liability whatsoever.

THESE MATERIALS ARE PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, RELATED TO SALES AND/OR USE OF SKYWORKSTM PRODUCTS INCLUDING WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSES, MERCHANTIBILITY, PERFORMANCE, QUALITY OR NON-INFRINGEMENT OF PATENT, COPYRIGHT OR INTELLECTUAL PROPERTY RIGHT. SKYWORKS FURTHER DOES NOT WARRANT THE ACCURACY OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN THESE MATERIALS, SKYWORKS SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION, LOSS OF REVENUES OR LOST PROFITS THAT MAY RESULT FROM THE USE OF THESE MATERIALS.

SkyworksTM products are not intended for medical, lifesaving or life-sustaining applications. Skyworks’ customers using or selling SkyworksTM products for use in such applications do so at their own risk and agree to fully indemnify Skyworks for any damages resulting from such improper use or sale.

The following are trademarks of Skyworks Solutions, Inc.: SkyworksTM , the Skyworks symbol, “Breakthrough Simplicity”TM . Product names or sevices listed in this publication are for identification purposes only, and may be trademarks of third parties. Third-party brands and names are the property of their respective owners.

Additional information, posted at www.skyworksinc.com, is incorporated by reference.



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