RF106 datasheet(2/6 Pages) CONEXANT

2 / 6 page

RF106 900 MHz Power Amplifier

Conexant

W118

2/1/98

Technical Description

The RF106 is a three stage, class AB RF power amplifier

for the 902-928 MHz ISM band. A class AB power

amplifier allows a wide range of output powers without

excessive idle power dissipation. Figure 3 shows a typical

application circuit for the RF106.

Recommendations on Layout and Implementation

Matching

An input matching network and an output matching

network are needed for maximum power transfer. For

greatest efficiency, it is recommended that the input

matching network be determined before the output

matching network. Matching network values are layout-

sensitive. If the RF106 is used with Conexant's RF105

transceiver, the input matching network is not required if

the connecting traces are short.

Bypassing

All VCC pins should have proper bypassing. These

decoupling capacitors should be placed very close to the

pins, preferably right at the Vcc pins.

A bypassing capacitor of 33pF and a decoupling capacitor

of 1nF for low frequency noise are recommended. Due to

layout variations the value of the capacitor may vary.

General Grounding Requirements

All ground pins should have minimum trace inductance to

ground. If a ground plane cannot be provided right at the

pins, the vias to ground plane should be placed as close

to the pins as possible. There should be one via for each

ground pin, unless otherwise specified. If the ground

plane is at the bottom layer, two vias per pin in parallel

may be required.

It is important to provide pins 13 and 14 with separate

low-impedance connections to GND, isolated from other

top-layer grounds.

NC pins are not used and should be connected to ac

ground, Vcc or ground, as shown in Figure 3.

ESD Sensitivity

The RF106 is a static-sensitive electronic device. Do not

operate or store near strong electrostatic fields. Take

proper Electrostatic Discharge (ESD) precautions.

RF106

Vcc

22nH

ENABLE

LPF

33pF

Output

matching

network*

section

1.5nH

Vcc

1nF

Ω

33pF

Vcc

1nF

Ω

33pF

Vcc

1nF

Ω

33pF

90°

phase

shifter

1nF

33pF

RFIN

Input

matching

network*

* Matching network values are layout-dependent.

33pF

Matching

network*

10k

Ω

470

Figure 3. RF106 Typical Application Circuit

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