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UAA2077CM

2 GHz image rejecting front-end

Philips Electronics 

Philips Semiconductors

2 GHz image rejecting front-end

Product specification

UAA2077CM

FUNCTIONAL DESCRIPTION

Receive section

The circuit contains a low-noise amplifier followed by two

high dynamic range mixers. These mixers are of the

Gilbert-cell type, the whole internal architecture is fully

differential.

The local oscillator, shifted in phase to 45° and 135°,

mixes the amplified RF to create I and Q channels.

The two I and Q channels are buffered, phase shifted by

45° and 135° respectively, amplified and recombined

internally to realize the image rejection.

Pin SBS allows sideband selection:

• fLO > fRF (SBS = 1)

• fLO < fRF (SBS = 0).

Where fRF is the frequency of the wanted signal.

Balanced signal interfaces are used for minimizing

crosstalk due to package parasitics.

The IF output is differential and of the open-collector type.

Typical application will load the output with a 680 Ω

resistor load at each IF output, plus a differential 1 kΩ load

made of the input impedance of the IF filter or the input

impedance of the matching network for the IF filter.

The power gain refers to the available power on this 1 kΩ

load. The path to VCC for the DC current should be

achieved via tuning inductors. The output voltage is limited

to VCC + 3Vbe or 3 diode forward voltage drops.

Fast switching, ON/OFF, of the receive section is

controlled by the hardware input RXON.

handbook, full pagewidth

VCCLNA

RFINA

RFINB

LNAGND

LNA

MIXER

IF

amplifier

MIXER

IF

amplifier

LOIN

+45o

SBS

IF

COMBINER

+135o

RXON

IFA

IFB

MGD754

Fig.3 Block diagram, receive section.

1997 Sep 24

5

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