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PDF SKY77344-21 Data sheet ( Hoja de datos )
| Número de pieza | SKY77344-21 | |
| Descripción | Power Amplifier Module | |
| Fabricantes | Skyworks Solutions | |
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APPLICATION NOTE
SKY77344-21 Power Amplifier Module — Evaluation
Information
Applicability: SKY77344 Version -21
Introduction
This Application Note describes the functionality, board layout and applications instructions of the SKY77344-21 Power Amplifier Module.
The SKY77344-21 Power Amplifier Module (PAM) is designed for quad-band cellular handsets comprising GSM850/900, DCS1800/
PCS1900, and supports Class 12 General Packet Radio Service (GPRS) multi-slot operation, and Enhanced Data GSM Environment (EDGE)
(8PSK) linear modulation. A single analog control voltage is used at the VRAMP port for both GMSK and EDGE modes. The active logic level
at the MODE terminal determines the function of the VRAMP signal.
The EDGE mode is supported with a linear open loop configuration where amplifier gain is held constant with VRAMP and output power is
determined by input power. GMSK mode is supported by operating the SKY77344-21 as a variable gain amplifier where VRAMP controls
gain and resultant output power.
The SKY77344-21 PAM consists of an Indium Gallium Phosphide (InGaP) PA block, a BiCMOS multi-function controller (MFC) block, and
impedance-matching circuitry. The new BiCMOS collector voltage amplitude controller (COVAC) provides envelope amplitude control and
bias optimization for each mode of operation, thus reducing sensitivity to input drive, temperature, power supply, and process variations.
Embedded within a single Gallium Arsenide (GaAs) die using InGaP technology, one Heterojunction Bipolar Transistor (HBT) PA lineup
supports the GSM850/900 bands and another supports the DCS1800 and PCS1900 bands.
The module also contains band select switching circuitry to select GSM (logic 0) and DCS/PCS (logic 1) as determined from the Band
Select (BS) signal. As determined by the MODE control, VRAMP controls the level of output power for GMSK modulation or optimizes the
performance for EDGE modulation. The Enable input signal allows initial turn-on of the PAC circuitry to minimize battery drain.
Figure 1. SKY77344-21 Functional Block Diagram
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201236A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 16, 2010
1
1 page  
SKY77344 POWER AMPLIFIER MODULE – EVALUATION INFORMATION
LOGIC and INPUT SETTINGS
Operational State
Standby/PA off
Low band GMSK2
Low band EDGE3
High band GMSK2
High band EDGE3
1 X = don’t care
2 VRAMP controls output power
3 VRAMP sets PA bias
Table 1. Control Logic
EN BS
0X
10
10
11
11
APPLICATION NOTE
MODE
X
0
1
0
1
VRAMP
X
Active 2
Active 3
Active 2
Active 3
Table 2. Maximum Bias Voltages to Achieve Rated POUT – EDGE and GMSK
Band and Modulation
VRAMP
Input
CEL/EGSM_TX EDGE
DCS/PCS_TX EDGE
CEL/EGSM_TX GMSK
DCS/PCS_TX GMSK
2.0 V
2.0 V
2.0 V
2.0 V
Mode
High
High
Low
Low
SKY77344-21 Test Fixture
The SKY77344-21 test fixture assembly is shown in Figure 3 and the schematic of the test fixture is shown in Figure 4. Artwork of the four
layers of the test fixture assembly is shown in Figure 5 through Figure 8.
Not all components shown are installed on the test fixture. R1 is installed to connect VRAMP from P1. Alternately, R2 and J1 may be
installed to allow application of VRAMP via the SMA coaxial connector. C3, C6, and C7 are not normally installed but provide mounting
locations for additional capacitance to VBATT to insure good low frequency bypassing, depending on the quality of the bench power
supply used. A VBATT_SENSE line (Figure 3, connector P1.5) provides feedback to a sensing power supply to help maintain proper voltage
under transient conditions.
A single analog control voltage is used at the VRAMP port for both the GMSK and EDGE modes. The active signal is ultimately determined
by the MODE control logic level applied. Figure 11 through Figure 15 provide recommended control timing and VRAMP profiles for proper
operation in GMSK mode, EDGE mode, and multimode slot-to-slot operation. Table 1 shows the proper control logic combinations for
GMSK and EDGE modes of operation for low band and high band.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201236A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 16, 2010
5
5 Page 
SKY77344 POWER AMPLIFIER MODULE – EVALUATION INFORMATION
APPLICATION NOTE
Figure 9. SKY77344-21 Power Amplifier Test Fixture PCB Layer 4
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201236A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 16, 2010
11
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet SKY77344-21.PDF ] | |
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