Datasheet SNA-486 Datasheet (Stanford Microdevices)

Product Description

Stanford Microdevices SNA-486 is a high performance Gallium
Arsenide Heterojunction Bipolar Transistor MMIC Amplifier. A
Darlington configuration is utilized for broadband performance
up to 6.5 GHz. The heterojunction increases breakdown voltage
and minimizes leakage current between junctions. Cancellation
of emitter junction non-linearities results in higher suppression of
intermodulation products. Typical IP3 at 850 MHz with 65mA is

32.3 dBm.

These unconditionally stable amplifiers provide 13.6 dB of gain
and 17.5 dBm of 1dB compressed power and require only a
single positive voltage supply. Only 2 DC-blocking capacitors, a
bias resistor and an optional inductor are needed for operation.
This MMIC is an ideal choice for wireless applications such as
cellular, PCS, CDPD, wireless data and SONET.

Small Signal Gain vs. Frequency @ ID=65mA

15

10

dB

5

Preliminary

Preliminary

SNA-486

DC-6.5 GHz, Cascadable
GaAs HBT MMIC Amplifier

NGA-486 Recommended for New Designs

Product Features

 High Output IP3: 32.3 dBm @ 850 MHz

 Cascadable 50 Ohm Gain Block
 Patented GaAs HBT Technology
 Operates From Single Supply

0

02468

Frequency GHz

Applications

 Cellular, PCS, CDPD, Wireless Data, SONET

Electrical Specifications

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The information provided herein is believed to be reliable at press time. Stanford Microdevices assumes no responsibility for inaccuracies or omissions.
Stanford Microdevices assumes no responsibility for the use of this information, and all such information shall be entirely at the users own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. Stanford Microdevices does not authorize or warrant any Stanford
Microdevices product for use in life-support devices and/or systems.
Copyright 2000 Stanford Microdevices, Inc. All worldwide rights reserved.

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http://www.stanfordmicro.comPhone: (800) SMI-MMIC522 Almanor Ave., Sunnyvale, CA 94085

1.71

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9.03

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2.81

EDS-101396 Rev A

SNA-486 DC-6.5GHz Cascadable MMIC Amplifier

Absolute Maximum Ratings

Preliminary

Preliminary

Operation of this device above any one of these parameters
may cause permanent damage.

Bias Conditions should also satisfy the following expression:
IDVD (max) < (TJ - TOP)/Rth, j-l

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*NOTE: While the SNA-486 can be operated at different bias currents, 65 mA is the recom­mended bias for lower junction temperature and longer life. This reflects typical operating condi­tions which we have found to be an optimal balance between high IP3 and MTTF. In general, MTTF
is improved to more than 100,000 hours when biasing at 65 mA and operating up to 85°C ambient
temperature.

2

http://www.stanfordmicro.comPhone: (800) SMI-MMIC522 Almanor Ave., Sunnyvale, CA 94085

EDS-101396 Rev A

Preliminary

Preliminary

SNA-486 DC-6.5GHz Cascadable MMIC Amplifier

200

Junction Temp vs. Dissipated Power MTTF vs. Dissipated Power

180

160

Junction Temperature (°C)

85C lead temp

140

0.25 0.35 0.45

40

35

dBm

30

25

0.5 1.5 2.5 3.5

Output IP3 vs. ID vs. Frequency

Pdiss (W)

GHz GHz

65mA
80mA

1.E+08

85C lead temp

1.E+07

1.E+06

MTTF (hrs)

1.E+05

1.E+04

0.25 0.35 0.45

Pdiss (W)

21

19

dBm

17

15

13

Output P1dB vs. ID vs. Frequency

0.5 1.5 2.5 3.5

65mA
80mA

5.5

NF vs. ID vs. Frequency Small Signal Gain vs. ID vs. Frequency

5.25

dB

5

4.75

4.5

0.5 1 1.5 2

GHz

65mA
80mA

dB

14

13.8

13.6

65mA
80mA

13.4

13.2

13

0.5 1.5 2.5 3.5

3

GHz

http://www.stanfordmicro.comPhone: (800) SMI-MMIC522 Almanor Ave., Sunnyvale, CA 94085

EDS-101396 Rev A

SNA-486 DC-6.5GHz Cascadable MMIC Amplifier

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Application Schematic for Operation at 850 MHz

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Rbias

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50 ohm

microstrip

2

1

3

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4

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Application Schematic for Operation at 1950 MHz

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microstrip

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http://www.stanfordmicro.comPhone: (800) SMI-MMIC522 Almanor Ave., Sunnyvale, CA 94085

VS

EDS-101396 Rev A

Preliminary

Preliminary

SNA-486 DC-6.5GHz Cascadable MMIC Amplifier

dB

dB

15

10

5

0

02468

S21, ID=65mA, T=25°C

Frequency GHz

0

-5

-10

-15

-20

02468

S11, ID=65mA, T=25°C

Frequency GHz

=65mA, T=25°C

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Frequency GHz

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D

Frequency GHz

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Freq. Min = 0.05 GHz

Freq. Max = 10 GHz

F = 10 GHz

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Freq. Min = 0.05 GHz

Freq. Max = 10 GHz

F = 10 GHz

http://www.stanfordmicro.comPhone: (800) SMI-MMIC522 Almanor Ave., Sunnyvale, CA 94085

5

EDS-101396 Rev A

Preliminary

Preliminary

SNA-486 DC-6.5GHz Cascadable MMIC Amplifier

Part Number Ordering Information

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684-ANS"70001

Caution ESD Sensitive:

Appropriate precautions in handling, packaging
and testing devices must be observed.

Evaluation Board Layout

The part will be symbolized with an S4 designator on

Part Symbolization

the top surface of the package.

PCB Pad Layout

Package Dimensions

Dimensions are in inches [mm]

6

http://www.stanfordmicro.comPhone: (800) SMI-MMIC522 Almanor Ave., Sunnyvale, CA 94085

EDS-101396 Rev A