uaa2077cm NXP Semiconductors, uaa2077cm Datasheet - Page 5

• Manufacturer Part Number: uaa2077cm
• Description: 2 Ghz Image Rejecting Front-end
• Manufacturer: NXP Semiconductors

Philips Semiconductors
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:
Where f
1997 Sep 24
handbook, full pagewidth
f
f
2 GHz image rejecting front-end
LO
LO
> f
< f
RF
RF
RF
is the frequency of the wanted signal.
(SBS = 1)
(SBS = 0).
V CCLNA
LNAGND
RFINA
RFINB
LNA
Fig.3 Block diagram, receive section.
MIXER
MIXER
LOIN
amplifier
amplifier
IF
IF
5
Balanced signal interfaces are used for minimizing
crosstalk due to package parasitics.
The IF output is differential and of the open-collector type.
Typical application will load the output with a 680
resistor load at each IF output, plus a differential 1 k load
made of the input impedance of the IF filter or the input
impedance of the matching network for the IF filter.
The power gain refers to the available power on this 1 k
load. The path to V
achieved via tuning inductors. The output voltage is limited
to V
Fast switching, ON/OFF, of the receive section is
controlled by the hardware input RXON.
135
CC
45
o
o
+ 3V
RXON
be
or 3 diode forward voltage drops.
COMBINER
CC
SBS
IF
for the DC current should be
MGD754
UAA2077CM
Product specification
IFA
IFB