UAA2077 データシートの表示（PDF） - Philips Electronics

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UAA2077

2 GHz image rejecting front-end

Philips Electronics 

Philips Semiconductors

2 GHz image rejecting front-end

Product specification

UAA2077BM

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 188 MHz

• On-chip quadrature network

• 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

• 1800 MHz front-end for DCS1800 hand-portable

equipment

• Compact digital mobile communication equipment

• TDMA receivers e.g. PCS and RF-LANS.

GENERAL DESCRIPTION

UAA2077BM contains both a receiver front-end and a high

frequency transmit mixer intended to be used in 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 UAA2077BM 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 the

LO + IF frequency are rejected through this signal

processing while signals at the 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.

The transmit section consists of a low-noise amplifier and

a down-conversion mixer. 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.

Pins RXON, TXON and SXON enable a selection to be

made of whether to reject the upper or lower image

frequency and control of the different power-down modes.

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

QUICK REFERENCE DATA

SYMBOL

VCC

ICC(RX)

ICC(TX)

ICC(PD)

Tamb

PARAMETER

supply voltage

receive supply current

transmit supply current

supply current in power-down

operating ambient temperature

MIN.

3.6

21.5

10.5

−

−30

TYP.

4.0

26.5

13.5

−

+25

MAX.

5.3

33.5

18

50

+85

UNIT

V

mA

mA

µA

°C

ORDERING INFORMATION

TYPE

NUMBER

UAA2077BM

NAME

SSOP20

PACKAGE

DESCRIPTION

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

VERSION

SOT266-1

1995 Dec 13

2

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