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PDF UAA2073AM Data sheet ( Hoja de datos )
| Número de pieza | UAA2073AM | |
| Descripción | Image rejecting front-end for GSM applications | |
| Fabricantes | NXP Semiconductors | |
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INTEGRATED CIRCUITS
DATA SHEET
UAA2073AM
Image rejecting front-end
for GSM applications
Product specification
Supersedes data of 1996 Oct 23
File under Integrated Circuits, IC17
1997 Jan 27
1 page  
Philips Semiconductors
Image rejecting front-end
for GSM applications
Product specification
UAA2073AM
FUNCTIONAL DESCRIPTION
Receive section
The circuit contains a low-noise amplifier followed by two
high dynamic range mixers. These mixers are of the
Gilbert-cell type. The whole internal architecture is fully
differential.
The local oscillator, shifted in phase to 45° and 135°,
mixes the amplified RF to create I and Q channels.
The two I and Q channels are buffered, phase shifted by
45° and 135° respectively, amplified and recombined
internally to realize the image rejection.
Pin SBS allows sideband selection:
• fLO > fRF (SBS = 1)
• fLO < fRF (SBS = 0).
Where fRF is the frequency of the wanted signal.
Balanced signal interfaces are used for minimizing
crosstalk due to package parasitics. The RF differential
input impedance is 150 Ω (parallel real part), chosen to
minimize current consumption at best noise performance.
The IF output is differential and of the open-collector type,
tuned for 175 MHz. Typical application will load the output
with a 680 Ω resistor load at each IF output, plus a 1 kΩ
load consisting in the input impedance of the IF filter or in
the input impedance of the matching network for the IF
filter. The power gain refers to the available power on this
1 kΩ load. The path to VCC for the DC current should be
achieved via tuning inductors. The output voltage is limited
to VCC + 3Vbe or 3 diode forward voltage drops.
Fast switching, on/off, of the receive section is controlled
by the hardware input RXON.
handbook, full pagewidth
VCC1
RFINA
RFINB
GND1
LNA
MIXER
IF
amplifier
MIXER
IF
amplifier
LOIN
+45o
SBS
IF
COMBINER
+135o
RXON
IFA
IFB
MBH188
Fig.3 Block diagram, receive section.
1997 Jan 27
5
5 Page 
Philips Semiconductors
Image rejecting front-end
for GSM applications
INTERNAL PIN CONFIGURATION
DC
PIN
SYMBOL
VOLTAGE
(V)
1 SBS
10 SXON
11 RXON
12 TXON
4
VCC1
+3.75
15 VCC2 +3.75
7 GND1
0
16 GND2
0
5 RFINA +2.2
6 RFINB +2.2
8 TXINA +2.4
9 TXINB +2.4
13 TXOIFB
+1.9
Product specification
UAA2073AM
EQUIVALENT CIRCUIT
VCC
1
GND
MBH682
VCC
5, 8 6, 9
GND
MBH683
VCC
14 TXOIFA +1.9
13, 14
GND
MBH684
1997 Jan 27
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet UAA2073AM.PDF ] | |
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