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參數(shù)資料
| 型號(hào)： | ACPM-7813-TR1 |
| 英文描述： | CDMA/AMPS Power Amplifier Module |
| 中文描述： | 碼分多址/ AMPS二元功率放大器模塊 |
| 文件頁(yè)數(shù)： | 13/21頁(yè) |
| 文件大小： | 183K |
| 代理商： | ACPM-7813-TR1 |
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13
3. Dynamic Bias Control
Alternate Implementation
Phone designers can use
TX_ADC_ADJ pin of the
baseband IC to get dynamic bias
control with Vcntl pin of PA.
TX_ADC_ADJ is a PDM output
pin produced by the TX AGC
subsystem and used to control
the gain of the Tx signal prior to
the PA. The variable output levels
from two inverting operational
amplifiers, generated and com-
pared by TX_ADC_ADJ, provide
dynamic control voltages for the
Vcntl of 1.0V ~ 2.7V with a 0.1V
step.
Av = -(V1/Vin) = -R3/R2,
V1 = -(R3/R2)Vin,
Vo = -(R5/R4)V1= [(R5*R3)/(R4*R2)]*Vin
The using of combination of two
pins, PDM1 and TX_ADC_ADJ, is
another method of realizing a
dynamic bias control scheme.
The two OP Amps control the
Vcntl voltage levels with com-
pared and integrated circuits.
To Duplexer
Battery
PA
_
+
_
R3
V1
R4
R5
R2Vin
C1
R1
PA_ON
TX_ADC_ADJ
Baseband IC
TxIC
Vcontrol
Switch Circuit
Enable
Vdd1
Vdd2
Vcntl
Vbias
To Duplexer
Battery
PA
+
_
+
_
PA_ON
TX_ADC_ADJ
PDM1
Baseband IC
TxIC
Vcontrol
Switch Circuit
Enable
Vdd1
Vdd2
Vcntl
Vbias
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ACPM-7821 | 制造商:AVAGO 制造商全稱:AVAGO TECHNOLOGIES LIMITED 功能描述:4 x 4 Power Amplifier Module for J-CDMA (898 - 925 MHz) |
| ACPM-7821-BLK | 制造商:AVAGO 制造商全稱:AVAGO TECHNOLOGIES LIMITED 功能描述:4 x 4 Power Amplifier Module for J-CDMA (898 - 925 MHz) |
| ACPM-7821-TR1 | 制造商:AVAGO 制造商全稱:AVAGO TECHNOLOGIES LIMITED 功能描述:4 x 4 Power Amplifier Module for J-CDMA (898 - 925 MHz) |
| ACPM-7822 | 制造商:AVAGO 制造商全稱:AVAGO TECHNOLOGIES LIMITED 功能描述:JCDMA 4x4 Power Amplifier Module (898-925MHz) |
| ACPM-7822-BLK | 制造商:AVAGO 制造商全稱:AVAGO TECHNOLOGIES LIMITED 功能描述:JCDMA 4x4 Power Amplifier Module (898-925MHz) |
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