MITSUBISHI RF POWER MODULE

RA30H4452M

RA30H4452M

MITSUBISHI ELECTRIC

2 Dec 2002

8/9

ELECTROSTATIC SENSITIVE DEVICE

OBSERVE HANDLING PRECAUTIONS

Output Power Control:

Depending on linearity following 2 methods are recommended to control the output power:

a) Non-linear FM modulation:

When the Gate voltage is close to zero, the RF input signal is attenuated up to 60dB and only a small leakage

current is flowing from the battery into the Drain.

b) Linear AM modulation:

The Gate voltage is used to set the Drain quiescent current for the required linearity.

Oscillation:

To test RF characteristic this module is put on a fixture with 2 bias decoupling capacitors each on Gate and Drain, a

4.700pF chip capacitor, located close to the module, and a 22µF (or more) electrolytic capacitor.

When an amplifier circuit around this module shows oscillation following may be checked:

a) Do the bias decoupling capacitors have a low inductance pass to the case of the module ?

Ω ?

Ω ?

Frequent on/off switching:

In Base Stations frequent on/off switching can result in reduced or no output power, when the resin that coats the

transistor chips gets thermally expanded by the on/off switching. The bond wires in the resin will break after long time

thermally induced mechanical stress.

Quality:

MITSUBISHI ELECTRIC cannot take any liability for failures resulting from Base Station operation time or operating

conditions exceeding those in Mobile Radios.

The technology of this module is the result of more than 20 years experience, field proven in several 10 million

Mobile Radios. Today most returned modules show failures as ESD, substrate crack, transistor burn-out, etc which

are caused by handling or operating conditions. Few degradation failures can be found.

Keep

safety

first

in

your

circuit

Mitsubishi Electric Corporation puts the maximum effort into making semiconductor products better and more

reliable, but there is always the possibility that trouble may occur with them. Trouble with semiconductors may lead

to personal injury, fire or property damage. Remember to give due consideration to safety when making your circuit

designs, with appropriate measures such as (i) placement of substitutive, auxiliary circuits, (ii) use of

non-flammable material or (iii) prevention against any malfunction or mishap.