UAA2077TS データシートの表示（PDF） - Philips Electronics

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UAA2077TS

2 GHz image rejecting front-end

Philips Electronics 

Philips Semiconductors

2 GHz image rejecting front-end

Preliminary specification

UAA2077TS

FEATURES

• Low noise, wide dynamic range amplifier

• Very low noise figure

• Dual balanced mixers for over 30 dB on-chip image

rejection

• Quadrature 200 MHz IF recombiner

• On-chip quadrature network

• Independent SX, RX, power-down control modes and

fast power-up switching

• Very small outline packaging

• No image filter required, resulting in a very small

application.

APPLICATIONS

• GSM dual band solution with UAA3522HL

• High frequency front-end for DCS1800/PCS1900

portable hand-held equipment

• Compact mobile digital communication equipment

• Time Division Multiple Access (TDMA) receivers e.g.

RF Local Area Networks (RF LANs).

GENERAL DESCRIPTION

The UAA2077TS contains a 2 GHz front-end receiver

intended to be used in mobile telephones. Designed in an

advanced BiCMOS process it combines high performance

with a low power consumption and high integration, thus

reducing external component costs and overall front-end

size.

The main advantage of the UAA2077TS is its ability to

provide an image rejection over 30 dB. Therefore, an

additional image filter between the Low Noise Amplifier

(LNA) and the mixer is not required.

Image rejection is achieved internally by two RF mixers in

quadrature operation and two all-pass filters in the I and Q

IF channels that shift the phase of signals by 45° and 135°

respectively. These two phase shifted IF signals are

combined and buffered to the front-end IF output signal.

An input signal with a frequency above the Local Oscillator

(LO) frequency results in an IF signal, while an input signal

with a frequency below the LO frequency is rejected.

The receive section consists of an LNA that drives a

quadrature mixer pair. The IF amplifier consists of an

on-chip 45° and 135° phase shifting network and an image

reject IF recombiner. The IF driver has differential

open-collector outputs.

The LO part consists of an internal all-pass phase shifting

filter to provide the quadrature LO signals for the mixers of

the receive section. The all-pass filter output signals are

buffered before being fed to the mixers. All RF inputs and

IF outputs are balanced.

Pins RXON and SXON allow control of the different active

modes and power-down. The SX mode and the RX mode

are independent active states of the LO section and the

receive section respectively. When the logic level on

pin SXON is HIGH, all internal buffers in the LO path of the

circuit are turned on, thus minimizing LO pulling during the

independent powering up of the receive section. Special

care has been taken by design for fast switching from

power-down to any of the different active modes.

QUICK REFERENCE DATA

SYMBOL

VCC

ICC(pd)

ICC(SRX)

Tamb

PARAMETER

supply voltage

power-down supply current

supply current in SRX mode

ambient temperature

CONDITIONS

MIN.

2.7

−

−

−30

TYP.

2.8

−

25

+25

MAX. UNIT

3.3 V

50

µA

28

mA

+70 °C

ORDERING INFORMATION

TYPE

NUMBER

UAA2077TS/D

NAME

SSOP16

PACKAGE

DESCRIPTION

plastic shrink small outline package; 16 leads; body width 4.4 mm

VERSION

SOT369-1

2000 Apr 17

2

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