STPAC01F1 查看數據表（PDF） - STMicroelectronics

零件编号

产品描述 (功能)

生产厂家

STPAC01F1

RF DETECTOR FOR POWER AMPLIFIER CONTROL

STMicroelectronics 

APPLICATION DIAGRAM

Coupler

RF input

RF detector

VBIAS

Low pass

filter

Thermal

compensation

STPAC01F1

VDCOut

Vtemp

GND1

GND2

STPAC01F1

IDC = 50µA

-

Out

+

IDC = 50µA

The STPAC01 is the first part of the power amplifier stage and provides both RF power and die

temperature measurements. The above figure gives the basic circuit of RF detector.

A coupler located on the line between RF amplifier output and the antenna takes a part of the available

power and applies it to STPAC01 RF input.

The RF detector and the low pass filter provide a DC voltage depending on the input power. Thermal

compensation provides a DC voltage depending on the ambient temperature. As the detection system and

the thermal compensation are based on the same topology, VDCout will have the same temperature

variation as Vtemp. Connected to a differential amplifier, the output will be a voltage directly linked to the

RF input power. VDCout and Vtemp must be bias with 50µA DC current.

This topology offers the most accurate output value as it is 100% compensated.

Fig. 1: VDCout measurement circuit.

Fig. 2: VDCout versus RF input power.

RF generator

Power

supply

RF in

STPAC

VDCOut

test board

Multimeter

VBIAS

DC output

voltage

Current

IDC

generator

VDCout

2

1.8

1.6

Tamb = 25°C

1.4

Ibias = 50µA

Vbias = 2.7V

1.2

1

0.8

-20

-15

-10

-5

Pin (dBm)

1850MHz

850MHz

0

5

10

3/6

Share Link: