UAA2077CM 查看數據表（PDF） - Philips Electronics

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UAA2077CM

2 GHz image rejecting front-end

Philips Electronics 

Philips Semiconductors

2 GHz image rejecting front-end

Product specification

UAA2077CM

FEATURES

• Low-noise, wide dynamic range amplifier

• Very low noise figure

• Dual balanced mixer for over 30 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

• High frequency front-end for DCS1800/PCS1900

hand-portable equipment

• Compact digital mobile communication equipment

• TDMA receivers e.g. RF-LANS.

GENERAL DESCRIPTION

UAA2077CM 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 UAA2077CM is its ability to

provide over 30 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.

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.

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 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 allow to control the different

power-down modes. A synthesizer-on (SX) mode enables

LO buffers independent of the other circuits. When

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

the circuit are turned on, thus minimizing LO pulling when

remainder of the receive or transmit chain is powered up.

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

27.5

11

−

−30

TYP.

3.75

36

14

−

+25

MAX.

5.3

44.5

17.5

50

+75

UNIT

V

mA

mA

µA

°C

1997 Sep 24

2

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