uaa2077am NXP Semiconductors, uaa2077am Datasheet - Page 5

• Manufacturer Part Number: uaa2077am
• Description: Image Rejecting Front-end For Dect Applications
• Manufacturer: NXP Semiconductors

Philips Semiconductors
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 V
connecting a resistor between V
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.
1996 Jul 04
Image rejecting front-end
for DECT applications
handbook, full pagewidth
LNAGND
V CCLNA
RFINA
RFINB
QUADLO
LNA
. This should be achieved by
QUADLO
Fig.3 Block diagram, receive section.
MIXER
MIXER
and V
LOIN
CC
. Over
amplifier
amplifier
IF
IF
5
handbook, halfpage
135
45
o
o
RXON
V QUADLO
LOGND
V CCLO
Fig.4 Block diagram, LO section.
COMBINER
SBS
IF
LOINA
QUAD
to RX
MBH152
LOINB
UAA2077AM
Product specification
IFA
IFB
MBH153