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BGY288 Datasheet(PDF) 13 Page - NXP Semiconductors

Part # BGY288
Description  Power amplifier with integrated control loop for GSM850, EGSM900, DCS1800 and PCS1900
PDF  22 Pages
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

BGY288 Datasheet(HTML) 13 Page - NXP Semiconductors

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9397 750 14011
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Preliminary data sheet
Rev. 01 — 2 February 2005
13 of 22
Philips Semiconductors
BGY288
Power amplifier with integrated control loop
a. Conversion gain (CG)
b. Small signal gain (SSG)
The total noise at the output of the power amplifier is the summation of three sources:
The noise present at the input of the power amplifier at fSS1 amplified by the conversion gain.
The noise present at the input of the power amplifier at fSS2 amplified by the small signal gain.
The noise generated by the power amplifier itself, when the noise at the input of the power
amplifier is zero.
Fig 4.
Input and output signals
001aaa701
P
f
PSS1
fSS1 f0
PD
P
f
PL(SS1)
PL(CON)
fSS1
f0 2f0 − fSS1
PL
POWER
AMP
CG = PL(CON) − PSS1
001aaa702
P
f
PD
f0 fSS2
PSS2
P
f
PL(SS2)
f0
fSS2
PL
POWER
AMP
SSG = PL(SS2) − PSS2



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