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UAA2077AM View Datasheet(PDF) - Philips Electronics

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UAA2077AM Datasheet PDF : 16 Pages
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Philips Semiconductors
Image rejecting front-end
for DECT applications
Product speciļ¬cation
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
 

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