uaa2067g NXP Semiconductors, uaa2067g Datasheet - Page 2

• Manufacturer Part Number: uaa2067g
• Description: Image Reject 1800 Mhz Transceiver For Dect Applications
• Manufacturer: NXP Semiconductors

Philips Semiconductors
FEATURES
APPLICATIONS
GENERAL DESCRIPTION
The UAA2067G is a low-power transceiver intended for
use in portable and base station transceivers complying
with the DECT system. The IC performs in accordance
with specifications in the 30 to +85 C temperature range.
The UAA2067G contains a front-end receiver for the
1800 to 1900 MHz frequency range, a high-frequency
VCO for the 1650 to 1850 MHz range, a low-frequency
VCO for the 100 to 140 MHz frequency range and a
transmitter with a high-output power amplifier driver stage
for the 1800 to 1900 MHz frequency range. 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 radio size.
Its first advantage is to provide typically 34 dB of image
rejection in the receiver path. Thus, the image filter
between the LNA and the mixer is redundant and
consequently can be removed. The receive section
ORDERING INFORMATION
1996 Oct 22
UAA2067G
TYPE NUMBER
Receiver with:
– low noise amplifier
– dual quadrature mixers for image rejection
– I and Q combining networks at a fixed IF
Both high-frequency and low-frequency VCOs including
buffers with good isolation for low pulling
Transmitter with:
– dual quadrature mixers for image rejection
– amplitude ramping circuit
– amplifier with high output power.
1800 MHz transceiver for DECT hand-portable
equipment
TDMA systems.
Image reject 1800 MHz transceiver
for DECT applications
(lower sideband)
(lower sideband)
LQFP32
NAME
plastic low profile quad flat package; 32 leads; body 5
2
DESCRIPTION
consists of a low-noise amplifier that drives a quadrature
mixer pair. Image rejection is achieved by this RF mixer
pair and the two phase shifters in the I and Q 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.
Signals presented at the RF input at LO
rejected through this signal processing while signals at
LO + IF frequency can form the IF signal.
Its second advantage is to provide a good buffered
high-frequency VCO signal to the RX and TX mixers and
to the synthesizer-prescaler. Switching the receive or
transmit section on gives a very small change in VCO
frequency.
Its third advantage is to provide a good buffered
low-frequency VCO signal to the TX mixers, to the
synthesizer-prescaler and the second down conversion
mixer in a double conversion receiver. Switching the
transmit section on gives a very small change in
VCO frequency.
The frequency of each VCO is determined by a resonator
network that is external to the IC. Each VCO has a
regulated power supply voltage that has been designed
specifically for minimizing a change in frequency due to
changes in the power supply voltage, which may be
caused for instance by switching on the power amplifier.
Its fourth advantage is to provide typically 33 dBc of image
rejection in the single-sideband up-conversion mixer. Thus
the image filter between the power amplifier and the
antenna is redundant and may consequently be removed.
Image rejection is achieved in the internal architecture by
two RF mixers in quadrature and two phase shifters in the
low-frequency VCO signal that shifts the phase to
0 and 90 . The output signals of the mixers are summed
to form the single-upper-sideband output signal.
The output stage is a high-level output buffer with an
output power of approximately 4 dBm. The output level is
sufficient to drive a three-stage bipolar preamplifier
for DECT.
PACKAGE
5
1.4 mm
Product specification
UAA2067G
IF frequency are
SOT401-1
VERSION