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PDF SKY65120 Data sheet ( Hoja de datos )
| Número de pieza | SKY65120 | |
| Descripción | WCDMA PA Bias Method | |
| Fabricantes | Skyworks Solutions | |
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application note
SKY65120: WCDMA PA Bias Method For Lower Junction
Temperature
Introduction
This application note describes how SKY65120 may be used with
reduced bias control to obtain better thermal performance. It is
especially useful for customers who may not have a suitable
heat sink available directly below the PA module.
To achieve high gain (>23 dB), the SKY65120 consists of two
stages of amplification. The base current of each amplification
stage is controlled by an on-die active bias circuit. Each active bias
circuit has its own reference voltage supply, Vref1 and Vref2. The
bias voltage (Vc_Bias) is shared by the two active bias circuits.
This application note describes the active bias circuit used by
SKY65120. The note explains the use of external supply voltages
(Vc_Bias and Vref) and setting limits available to the customer. Test
results of key parameters are also given over temperature.
VREF1
(5 V)
RREF1
VC_BIAS
(5 V)
VREF2
(5 V)
RREF2
Active
Bias 1
Active
Bias 2
RF In Input
Match
Stage 1
Inter-
stage
Match
Stage 2
Output
Match
RF Out
VCC1
VCC2
(5 V) (5 V)
Figure 1. Functional Diagram of SKY65120 PA Module
Active Bias Circuit
Circuit Description
The active circuit is designed to maintain a constant supply cur-
rent to the base of its respective transistor as supply voltage and
temperature is changed. Each active bias circuit consists of three
HBT transistors and three resistors, connected as shown in Figure
2 below.
VC_BIAS
R1
Q1
Q3
R3
R2
Q2
I_Supply
(to Base of PA)
RREF
(On PCB)
VREF
Figure 2. Schematic Diagram of Active Bias Circuit
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201019 Rev. A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 26, 2009
1
Free Datasheet http://www.nDatasheet.com
1 page  
Application Note • SKY65120: WCMDA PA Bias Method For Lower Junction Temperature
Copyright © 2009, Skyworks Solutions, Inc. All Rights Reserved.
Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided
by Skyworks as a service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the
information contained herein. Skyworks may change its documentation, products, services, specifications or product descriptions at any time, without notice. Skyworks makes no commitment to
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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201019 Rev. A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 26, 2009
5
Free Datasheet http://www.nDatasheet.com
5 Page | ||
| Páginas | Total 5 Páginas | |
| PDF Descargar | [ Datasheet SKY65120.PDF ] | |
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