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UAA2077AM

Image rejecting front-end for DECT applications

Philips Electronics 

Philips Semiconductors

Image rejecting front-end

for DECT applications

Product specification

UAA2077AM

FEATURES

• Low-noise, wide dynamic range amplifier

• Very low noise figure

• Dual balanced mixer for over 25 dB on-chip image

rejection

• IF I/Q combiner at 110 MHz

• On-chip quadrature network

• RX fast on/off power-down mode

• Shrink small outline packaging

• Very small application (no image filter).

APPLICATIONS

• 1800 MHz front-end for DECT hand-portable

equipment

• Compact digital mobile communication equipment

• TDMA receivers.

GENERAL DESCRIPTION

UAA2077AM contains a high frequency low noise receiver

front-end intended to be used in DECT mobile 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 UAA2077AM is its ability to

provide over 25 dB of image rejection. Consequently, the

image filter between the LNA and the mixer is suppressed.

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.

For instance, 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.

An internal switch enables the upper or lower image

frequency to be rejected.

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 centre frequency of the phase shifter is

adjustable for maximum image rejection in a given band.

The all-pass filters outputs are buffered before being fed to

the receive mixers. All RF and IF inputs or outputs are

balanced.

Two pins RXON and SXON are used to control the

different power-down modes. A special mode of operation

called synthesizer-on mode (SX mode), controlled by pin

SXON can be used to minimize the LO pulling when the

receiver is turned on. When SXON is HIGH, all internal

buffers on the LO path are turned on. Pin SBS allows a

selection of whether to reject the upper or lower image

frequency. Special care has been taken for fast power-up

switching.

QUICK REFERENCE DATA

SYMBOL

VCC

ICC(RX)

ICC(PD)

Tamb

PARAMETER

supply voltage

receive supply current

supply current in power-down

operating ambient temperature

CONDITIONS

Tamb = 0 to +70 °C

over full temperature range

MIN.

3.15

3.6

21.5

−

−30

TYP.

4.0

4.0

26.5

0.2

+25

MAX.

5.3

5.3

33.5

50

+85

UNIT

V

V

mA

µA

°C

ORDERING INFORMATION

TYPE NUMBER

UAA2077AM

PACKAGE

NAME

DESCRIPTION

SSOP20 plastic shrink small outline package; 20 leads; body width 4.4 mm

VERSION

SOT266-1

1996 Jul 04

2

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