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Электронный компонент: UAA2073AM/C1

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DATA SHEET
Product specification
Supersedes data of 1996 Oct 23
File under Integrated Circuits, IC17
1997 Jan 27
INTEGRATED CIRCUITS
UAA2073AM
Image rejecting front-end
for GSM applications
1997 Jan 27
2
Philips Semiconductors
Product specification
Image rejecting front-end
for GSM applications
UAA2073AM
FEATURES
Low-noise, wide dynamic range amplifier
Very low noise figure
Dual balanced mixer for at least 30 dB on-chip image
rejection
IF I/Q combination network for 175 MHz
Down-conversion mixer for closed-loop transmitters
Independent TX/RX fast on/off power-down modes
Very small outline packaging
Very small application (no image filter).
APPLICATIONS
900 MHz front-end for GSM hand-portable equipment
Compact digital mobile communication equipment
TDMA receivers.
GENERAL DESCRIPTION
UAA2073AM contains both a receiver front-end and a high
frequency transmit mixer intended for GSM
(Global System for Mobile communications) cellular
telephones. Designed in an advanced BiCMOS process it
combines high performance with low power consumption
and a high degree of integration, thus reducing external
component costs and total front-end size.
The main advantage of the UAA2073AM is its ability to
provide over 30 dB of image rejection. Consequently, the
image filter between the LNA and the mixer is suppressed
and the duplexer design is eased, compared with a
conventional front-end design.
Image rejection is achieved in the internal architecture by
two RF mixers in quadrature and two all-pass filters in
I and Q IF channels that phase shift the IF by 45
and 135
respectively. The two phase shifted IFs are recombined
and buffered to furnish the IF output signal.
This means that signals presented at the RF input at
LO
-
IF frequency are rejected through this signal
processing while signals at LO + IF frequency can form the
IF signal.
The receiver section consists of a low-noise amplifier that
drives a quadrature mixer pair. The IF amplifier has
on-chip 45
and 135
phase shifting and a combining
network for image rejection.The IF driver has differential
open-collector type outputs.
The LO part consists of an internal all-pass type phase
shifter to provide quadrature LO signals to the receive
mixers. The all-pass filters outputs are buffered before
being fed to the receive mixers.
The transmit section consists of a down-conversion mixer
and a transmit IF driver stage. In the transmit mode an
internal LO buffer is used to drive the transmit IF
down-conversion mixer.
All RF and IF inputs or outputs are balanced to reduce
EMC issues.
Fast power-up switching is possible. A synthesizer-on
(SX) mode enables LO buffers independent of the other
circuits. When SXON pin is HIGH, all internal buffers on
the LO path of the circuit are turned on, thus minimizing
LO pulling when remainder of receive chain is
powered-up.
ORDERING INFORMATION
TYPE
NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
UAA2073AM
SSOP20
plastic shrink small outline package; 20 leads; body width 4.4 mm
SOT266-1
1997 Jan 27
3
Philips Semiconductors
Product specification
Image rejecting front-end
for GSM applications
UAA2073AM
QUICK REFERENCE DATA
Note 1.
Note
1. For conditions see Chapters "DC characteristics" and "AC characteristics".
BLOCK DIAGRAM
SYMBOL
PARAMETER
MIN.
TYP.
MAX.
UNIT
V
CC
supply voltage
3.6
3.75
5.3
V
I
CC(RX)
receive supply current
21
26
32
mA
I
CC(TX)
transmit supply current
9
12
15
mA
NF
RX
noise figure on demonstration board (including matching
and PCB losses)
-
3.6
4.7
dB
G
CPRX
conversion power gain
19
22
25
dB
IR
image frequency rejection
30
45
-
dB
T
amb
operating ambient temperature
-
30
+25
+75
C
Fig.1 Block diagram.
handbook, full pagewidth
MGD149
LNA
IF
COMBINER
low-noise
amplifier
5
4
+
45
o
C
+
135
o
C
15
16
6
11
12
10
19
14
13
20
1
8
17
18
RX
TX
IF
LO
9
TXINA
TXINB
LOINB
MIXER
LOINA
2
3
IFA
IFB
TXOIFA
TXOIFB
n.c.
n.c.
SBS
QUADRATURE
PHASE
SHIFTER
CURRENT
REGULATORS
RFINA
RFINB
7
GND1
RXON
TXON
SXON
GND2
VCC1
VCC2
UAA2073AM
RECEIVE SECTION
TRANSMIT SECTION
LOCAL OSCILLATOR
SECTION
1997 Jan 27
4
Philips Semiconductors
Product specification
Image rejecting front-end
for GSM applications
UAA2073AM
PINNING
SYMBOL
PIN
DESCRIPTION
SBS
1
sideband selection (should be
grounded for f
LO
< f
RF
)
n.c.
2
not connected
n.c.
3
not connected
V
CC1
4
supply voltage for receive and
transmit sections
RFINA
5
RF input A (balanced)
RFINB
6
RF input B (balanced)
GND1
7
ground 1 for receive and transmit
sections
TXINA
8
transmit mixer input A (balanced)
TXINB
9
transmit mixer input B (balanced)
SXON
10
hardware power-on of LO section
(including buffers to RX and TX)
RXON
11
hardware power-on for receive
section and LO buffers to RX
TXON
12
hardware power-on for transmit
section and LO buffers to TX
TXOIFB
13
transmit mixer IF output B
(balanced)
TXOIFA
14
transmit mixer IF output A
(balanced)
V
CC2
15
supply voltage for LO section
GND2
16
ground 2 for LO section
LOINB
17
LO input B (balanced)
LOINA
18
LO input A (balanced)
IFB
19
IF output B (balanced)
IFA
20
IF output A (balanced)
Fig.2 Pin configuration.
handbook, halfpage
UAA2073AM
MGD150
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
SBS
n.c.
n.c.
RFINA
RFINB
GND1
TXINA
TXINB
SXON
RXON
TXON
TXOIFB
TXOIFA
GND2
LOINB
LOINA
IFB
IFA
VCC1
VCC2
1997 Jan 27
5
Philips Semiconductors
Product specification
Image rejecting front-end
for GSM applications
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:
f
LO
> f
RF
(SBS = 1)
f
LO
< f
RF
(SBS = 0).
Where f
RF
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
(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
resistor load at each IF output, plus a 1 k
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 k
load. The path to V
CC
for the DC current should be
achieved via tuning inductors. The output voltage is limited
to V
CC
+ 3V
be
or 3 diode forward voltage drops.
Fast switching, on/off, of the receive section is controlled
by the hardware input RXON.
Fig.3 Block diagram, receive section.
handbook, full pagewidth
MBH188
LNA
IF
COMBINER
IF
amplifier
IF
amplifier
MIXER
MIXER
RXON
LOIN
IFA
IFB
SBS
RFINA
RFINB
GND1
VCC1
+
45
o
+
135
o