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PDF UAA2077AM Data sheet ( Hoja de datos )
| Número de pieza | UAA2077AM | |
| Descripción | Image rejecting front-end for DECT applications | |
| Fabricantes | NXP Semiconductors | |
| Logotipo |  |
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INTEGRATED CIRCUITS
DATA SHEET
UAA2077AM
Image rejecting front-end
for DECT applications
Product specification
Supersedes data of 1995 Feb 16
File under Integrated Circuits, IC17
1996 Jul 04
1 page  
Philips Semiconductors
Image rejecting front-end
for DECT applications
Product specification
UAA2077AM
handbook, full pagewidth
VCCLNA
RFINA
RFINB
LNAGND
LNA
MIXER
IF
amplifier
MIXER
IF
amplifier
LOIN
+45o
SBS
IF
COMBINER
+135o
RXON
IFA
IFB
MBH152
Fig.3 Block diagram, receive section.
Local oscillator section
The local oscillator (LO) input directly drives the two
internal all-pass networks to provide quadrature LO to the
receive mixers.
The centre frequency of the receive band is adjustable by
the voltage on pin VQUADLO. This should be achieved by
connecting a resistor between VQUADLO and VCC. Over
25 dB of image rejection can be obtained by an optimum
resistor value.
A synthesizer-on (SX) mode is used to power-up the LO
input buffers, thus minimizing the pulling effect on the
external VCO when entering receive mode. This mode is
active when SXON = 1.
There are no internal biassing components attached to the
pins LOINA and LOINB. These pins are connected by
capacitors to the internal phase shifting network.
handbook, halfpage
VCCLO
to RX
VQUADLO
QUAD
LOGND
LOINA
LOINB
MBH153
Fig.4 Block diagram, LO section.
1996 Jul 04
5
5 Page 
RFIN
1880 to1900
MHz
2
1
4V
L6 5.6 nH
C6
8.2 pF
C1
C5
82 pF
C2 1.2 pF
L1 5.6 nH
8.2 pF L15
C3 6.8 nH
C14 1.2 pF
8.2 pF
VQUADLO
SXON
C30
8.2 pF
C31
82 pF
2
1 20
2 19
3 18
4 17
5 16
UAA2077AM
6 15
7 14
8 13
9 12
10 11
SBS
2
C8 R4
8.2 560
pF kΩ
C7
1 8.2
pF
R3 C9
560 1 8.2
kΩ pF
6.8 pF
22 pF C26
R6
1200 Ω
4V
R7
1200 Ω
L11
220
C22 IFA
120 pF
nH
L12 C23
220
IFB
6.8 pF
nH
120 nH
L13
C25
22 pF
IF
110 MHz
C24 L14 120 nH
4V
RXON
C19 C29
8.2 pF 8.2 pF
C27 C28
8.2 pF 1 nF
C20 3.3 nH C21
3.3 nH
R5 1.8 pF L9
1.8 pF L10
560
kΩ LOIN
1770 to 1790
MHz
4 V MGC631 - 1
Figure 5 illustrates the electrical diagram of the UAA2077AM Philips demonstration board for DECT applications. All matching is to 50 Ω for measurement purposes. Different values will
be used in a real application.
Fig.5 Application diagram.
11 Page | ||
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