• North America Tel: 800.366.2266 / Fax: 978.366.2266

• Europe Tel: 44.1908.574.200 / Fax: 44.1908.574.300

• Asia/Pacific Tel: 81.44.844.8296 / Fax: 81.44.844.8298

Visit www.macom.com for additional data sheets and product information.

M/A-COM Inc. and its affiliates reserve the right to make changes to the product(s) or

information contained herein without notice.

6

DECT Power Amplifier

1880 - 1930 MHz

M/A-COM Products

Rev. V1

MAAPSS0113

ADVANCED: Data Sheets contain information regarding a product M/A-COM is considering for

development. Performance is based on target specifications, simulated results, and/or prototype

measurements. Commitment to develop is not guaranteed.

PRELIMINARY: Data Sheets contain information regarding a product M/A-COM has under develop-

ment. Performance is based on engineering tests. Specifications are typical. Mechanical outline has

been fixed. Engineering samples and/or test data may be available. Commitment to produce in

volume is not guaranteed.

High Voltage Operation (3 Cells)

The MAAPSS0113 amplifier product is designed for

use in phone systems using 2 battery cells for mobile

units (3.6V charging, 2.4V nom.) or up to 3.6V

regulated for base-station units. For operation with

higher supply voltages such as in 3 cell mobile units

(4.5V charging), a dropping diode is required to

reduce the voltage to the amplifier.

An example

schematic is shown in Figure 1.

A series diode is

placed between the battery supply and the three

stages of the amplifier. An example diode is the

Vishay ES1A surface mount diode. This diode has a

maximum forward current of 1A and a forward

voltage drop of 1V.

C6

C7

C8

T3

V

BAT

C2

C3

C4

T4

D1

V

CC

V

CC1

V

CC2

V

CC3

Figure 2 shows the measured affect of the dropping

Because of the approximate 1V forward drop of the

diode, the maximum supply to the amplifier is 3.6V

for a charging condition of 4.5V. Figures 3 and 4

show the power and current versus a 3 cell battery

range, respectively. The 3 cell performance with the

dropping diode is very similar to the electrical

specification at 2.4V shown on page 2. The key to

matching this data is choosing a diode with

approximately 1V forward drop.

Because of this

forward drop, the maximum voltage from the battery

supply can increase from 4V to 5V.

Figure 2.

Figure 3.

Pout vs. 3 cell battery voltage

Figure 4.

Current vs. 3 cell battery voltage

Figure 1.

Supply schematic for 3 cell operation showing

external dropping diode, ex. Vishay ES1A

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

3.0

3.2

3.4

3.6

3.8

4.0

4.2

4.4

4.6

Battery Voltage (V)

0

5

10

15

20

25

30

3.0

3.2

3.43.6

3.84.0

4.24.4

4.6

HPM

LPM

Battery Voltage (V)

0

0.1

0.2

0.3

0.4

0.5

0.6

3.0

3.2

3.43.6

3.84.0

4.24.4

4.6

HPM

LPM

Battery Voltage (V)

3 Cell Changing

Voltage

Nominal 3 Cell

Voltage