RF2318 datasheet(4/6 Pages) RFMD

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Preliminary

3-24

RF2318

Rev A2 010228

Application Schematic

Function

Description

Interface Schematic

1RF IN

RF input pin. This pin is NOT internally DC blocked. A DC blocking

capacitor, suitable for the frequency of operation, should be used in all

applications. The device has internal feedback, and not using a DC

blocking capacitor will disable the temperature compensation.The bias

of the device can be controlled by this pin. Adding an optional 1k

Ω

resistor to ground on this pin reduces the bias level, which may be com-

pensated for by a higher supply voltage to maintain the appropriate

bias level. The net effect of this is an increased output power capability,

as well as higher linearity for signals with high crest factors. DC cou-

pling of the input is not allowed, because this will override the internal

feedback loop and cause temperature instability.

2GND

Ground connection. Keep traces physically short and connect immedi-

ately to ground plane for best performance. Each ground pin should

have a via to the ground plane.

3GND

Same as pin 2.

4GND

Same as pin 2.

5GND

Same as pin 2.

6GND

Same as pin 2.

7GND

Same as pin 2.

8RF OUT

RF output and bias pin. Because DC is present on this pin, a DC block-

ing capacitor, suitable for the frequency of operation, should be used in

most applications. For biasing, an RF choke in series with a resistor is

needed. The value for the resistor RC is 30Ω (0.5W) for VCC=9V and

Ω for V

CC = 12 V. The DC voltage on this pin is typically 7 V with a cur-

rent of 63mA. In lower power applications the value of RC can be

increased to lower the current and VD on this pin.

RF OUT

RF IN

220 pF

RF OUT

220 pF

RF IN

3.3

µH

C=30 - 82 Ω

CC=9-12V

Optional:

S=1-2k Ω

Note 1

Note 1:

Optional resistor Rs can be used to maintain the correct bias level at higher supply voltages. This

is useful to increase output capability or linearity for signals with high crest factors.

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