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參數(shù)資料
| 型號： | RM009 |
| 廠商： | SKYWORKS SOLUTIONS INC |
| 元件分類： | 放大器 |
| 英文描述： | Power Amplifier Module for Dual-band GSM900 DCS1800 |
| 中文描述： | 880 MHz - 915 MHz RF/MICROWAVE NARROW BAND MEDIUM POWER AMPLIFIER |
| 封裝： | 9.10 X 11.60 MM, SO-16 |
| 文件頁數(shù)： | 4/17頁 |
| 文件大小： | 304K |
| 代理商： | RM009 |
Technical Information
RM009
Power Amplifier Module for Dual-band GSM900 DCS1800 Applications
12
Skyworks Solutions, Inc. Proprietary
101258B
July 26, 2002
Due to output impedance effects, the bias of the GaAs devices increases as the supply voltage
increases. The Voltage Clamp is designed to gradually decrease in level as the battery voltage
increases. The performance of the clamp circuit is enhanced by the band gap reference that
provides a supply-, process-, and temperature-independent reference voltage. The transfer function
limited by the common mode range of the buffer amplifier. For battery voltages above 3.4 V, the
clamp limits the base bias.
Current Buffer
The output buffer amplifier performs a vital function in the CMOS device by transferring the APC
input voltage ramp to the base of the GaAs power devices. This allows the APC input to be a high
impedance port, sinking only 10
A, typical, assuring no loading effects on the PAC circuit. The
buffers are designed to source the high GaAs base currents required, while allowing a settling time
of less than 8
sec for a 1.5 V ramp.
Power Ramping Considerations for 3GPP Compliance
These are the primary variables in the power control loop that the system designer must control:
software control of the DSP / DAC
software control of the transmitter timing signals
ramp profile attributes - pedestal, number of steps, duration of steps
layout of circuit / parasitics
RC time constants within the PAC circuit design
All of these variables will directly influence the ability of a GSM transmitter power control loop to
comply with 3GPP specifications.
Although there is a specific time mask template in which the transmitter power is allowed to ramp
up, the method is very critical. The 3GPP system specification for switching transients results in a
Figure 9. Base Bias Clamp Voltage vs. Supply Voltage
1.7
1.8
1.9
2.0
2.1
2.2
2.3
2.4
2.5
2.6
3.00
3.25
3.50
3.75
4.00
4.25
4.50
Vcc (Volts)
Base
Bi
as
Cl
am
p
(V
ol
ts)
clamp
101258_013b
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