uaa3535hl NXP Semiconductors, uaa3535hl Datasheet - Page 5

• Manufacturer Part Number: uaa3535hl
• Description: Low Power Gsm/dcs/pcs Multi-band Transceiver
• Manufacturer: NXP Semiconductors

Philips Semiconductors
FUNCTIONAL DESCRIPTION
RF receiver
The receiver front-end converts the aerial RF signal from
EGSM (Extended GSM; 925 to 960 MHz), DCS
(1805 to 1880 MHz) or PCS (1930 to 1990 MHz) bands
down to an IF signal of 100 kHz. The first stages are
symmetrical LNAs that are matched to 50
baluns. The LNAs are followed by an I/Q down-mixer.
The I/Q down-mixer consists of two mixers in parallel but
driven by quadrature out of phase LO signals.
The In-phase (I) and Quadrature- phase (Q) IF signals are
then low-pass filtered to provide protection from high
frequency offset interferers. The IF I and Q signals are
then fed into the channel filter.
2000 Feb 17
handbook, full pagewidth
Low power GSM/DCS/PCS multi-band transceiver
V CC(TXCP)
V CC1(IF)
IFGND1
TXCPO
RXON
TXIFA
TXON
TSTO
QA
QB
IA
IB
10
11
12
2
3
4
5
6
7
8
9
1
using external
Fig.2 Pin configuration.
UAA3535HL
5
Channel filter and AGC
The front-end IF I and Q outputs are first applied to an
amplifier circuit with provision for three 8 dB gain step
adjustment possibilities and then to an integrated
band-pass channel filter. The filter is a fifth-order
band-pass filter centred around 100 with 220 kHz
bandwidth. After filtering the IF I and Q signals are further
amplified with provision for eleven 4 dB gain steps and
DC offset compensation.
I/Q modulator
I and Q baseband signals are applied to the I/Q modulator
where the modulation spectrum is shifted up to the
transmit IF frequency. For low harmonic distortion, low
carrier leakage and high image rejection, the phase error
must be kept as small as possible. The IF output of the
modulator is fed to an integrated low-pass filter where
unwanted spurious signals are suppressed, prior to being
fed to the phase detector.
36
35
34
33
32
FCA068
31
30
29
28
27
26
25
IFCIA
IFCIB
IFCQA
IFCQB
V CC(RFLO)
RFLOIB
RFLOIA
RFLOGND
SYNGND
V CC(SYN)
V CC(RFCP)
SYNON
Objective specification
UAA3535HL