The CMM3566-LC is a three stage amplifier that requires a

positive and a negative supply voltages for proper operation. It is

essential when turning on the device that the negative supply be

applied before the positive supply. When turning the device off,

the positive supply should be removed before the negative supply

is removed.

The CMM3566-LC can be operated over a range of supply

voltages and bias currents. It is important that the maximum power

dissipation specification for the package be observed at all times

and that the maximum voltage across the device not be exceeded.

Circuit Design Considerations

Biasing Three negative voltages are needed to set the bias current

of the 3-stage GaAs FET power amplifier. The first stage bias is

controlled via Vg1. The second stage bias is controlled via Vg2.

The output stage is controlled via Vg3. The recommended divider

networks for each gate bias shown in the schematic. The positive

supply voltage is applied to pins 5, 6, 7 and 8. The negative volt-

age supplies control the quiescent current of the device. The quies-

cent current needs to be set at the level specified in order to get the

guaranteed RF performances.

Negative bias voltages can also be used to control the gain,

the output power and the operating current during operation of the

device.

Matching Circuits Output matching circuit is required to achieve

the output power and gain guaranteed. Mimix’s recommenda-

tion for the topology of the matching circuit is shown in the

schematic diagram of the test circuit in this data sheet.

In providing both the negative and positive bias voltages, it is

important to provide adequate de-coupling between the RF signal

and the DC voltages. Inadequate de-coupling could result in low

output power, low gain or oscillation. Mimix recommends the

bias circuits shown in the evaluation circuit .

– Continued on Page 2 –

3.4 to 3.5 GHz, 7.0V, +24 dBm

W-CDMA Power Amplifier

Page 1 of 4

Mimix Broadband, Inc., 10795 Rockley Rd., Houston, Texas 77099

Tel: 281.988.4600 Fax: 281.988.4615 mimixbroadband.com

Characteristic Data and Specifications are subject to change without notice.

©2007 Mimix Broadband, Inc.

Export of this item may require appropriate export licensing from the U.S. Government. In purchasing these parts, U.S. Domestic customers accept

their obligation to be compliant with U.S. Export Laws.

CMM3566-LC

August 2007 - Rev 02-Aug-07

Functional Block Diagram

Ground Tab

Vg3 1

RF IN 4

Vg2 2

Vg1 3

7 RF OUT/+Vd3

8 RF OUT/+Vd3

5 Vd1

6 Vd2

Ground Tab

Features

7.0V Bias Voltage

+24 dBm Linear Output Power (W-CDMA)

30 dB Gain at Operating Output

Tested Under Digital Modulation (W-CDMA)

Leadless Chip Carrier (LCC) Package

Wireless Local Loop Subscriber Units

Wireless Local Loop Base Stations

Applications

The CMM3566-LC is a 7.0V, +24 dBm, linear power amplifier

intended for use in PCS handsets and wireless local loop

subscriber units and base stations. The amplifier is biased to meet

the requirements of linear modulation systems of W-CDMA. The

CMM3566-LC is packaged in a low-cost, space efficient, power

package that provides excellent electrical stability and low

thermal resistance. The part requires minimal external circuitry for

bias and matching to reduce space and cost.

General Description

Absolute Maximum Ratings

Application Information

Recommended Operating Conditions

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U

p

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T

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t

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m

a

r

a

P

s

t

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p

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a

P

Drain Voltage (+Vd)

7.0

Volts

Operating Temperature (PC Board)

-40 to +70

°C

Parameter

Rating

Parameter

Rating

Parameter

Rating

Drain Voltage (+Vd)

+8 V*

Power Dissipation

5 W

Operating Temperature

-30°C to +90°C

Drain Current (Id)

1.0 A

Thermal Resistance

20°C/W

Channel Temperature

150°C

RF Input Power

0 dBm*

Storage Temperature

-65°C to +150°C

Soldering Temperature

240°C for 5 Sec.

DC Gate Voltage (-Vg)

-4.0 V*

BVGD

18 V

* Max (+V

GD) of +18V.