RF2174PCBA-41X Просмотр технического описания (PDF) - RF Micro Devices

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RF2174PCBA-41X

3V DCS POWER AMPLIFIER

RF Micro Devices 

RF2174

Pin

1

2

3

4

5

6

7

8

9

10

11

12

13

14

Function

GND

AT_EN

RF IN

GND1

VCC1

APC1

Description

Interface Schematic

Internally connected to the ground slug.

See pin 15.

Control input for the PIN diode. The purpose of the PIN diode is to

attenuate the RF input drive level when the VAPC is low. This serves

both to reduce the leakage through the device cause by self biasing

when driving with high level at the RF input, as well as to maintain a

good input match when the bias of the input stage is turned off. When

this pin is “high” the PIN diode control is turned on. See the Theory of

Operation for more details.

RF Input. This is a 50Ω input, but the actual impedance depends on the

interstage matching network connected to pin 5. An external DC block-

ing capacitor is required if this port is connected to a DC path to ground

or a DC voltage.

AT_EN

3k Ω

To PIN

diode

GND1

VCC1

RF IN

PIN

GND 1

From Attn

From Bias

control circuit Stages

Ground connection for the pre-amplifier stage. Keep traces physically

short and connect immediately to the ground plane for best perfor-

mance. It is important for stability that this pin has it’s own vias to the

groundplane, to minimize any common inductance.

Power supply for the pre-amplifier stage and interstage matching. This

pin forms the shunt inductance needed for proper tuning of the inter-

stage match. Please refer to the application schematic for proper con-

figuration, and note that position and value of the components are

important.

Power Control for the driver stage and pre-amplifier. When this pin is

"low," all circuits are shut off. A "low" is typically 0.5V or less at room

temperature. A shunt bypass capacitor is required. During normal oper-

ation this pin is the power control. Control range varies from about 1.0V

for -10dBm to 2.6V for +33dBm RF output power. The maximum power

that can be achieved depends on the actual output matching; see the

application information for more details. The maximum current into this

pin is 5mA when VAPC1=2.6V, and 0mA when VAPC=0V.

See pin 3.

See pin 3.

APC VCC

To RF

Stages

APC2

VCC

GND

RF OUT

Power Control for the output stage. See pin 6 for more details.

GND

GND

See pin 6.

Power supply for the bias circuits.

See pin 6.

Internally connected to the ground slug.

RF Output and power supply for the output stage. Bias voltage for the

final stage is provided through this wide output pin. An external match-

ing network is required to provide the optimum load impedance.

RF OUT

RF OUT

RF OUT

2F0

VCC2

Same as pin 10.

From Bias

Stages GND

PCKG BAS

Same as pin 10.

Same as pin 10.

Same as pin 10.

Connection for the second harmonic trap. This pin is internally con-

nected to the RF OUT pins. The bonding wire together with an external

capacitor form a series resonator that should be tuned to the second

harmonic frequency in order to increase efficiency and reduce spurious

outputs.

Same as pin 15.

Same as pin 10.

2-278

Rev A8 060918

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