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

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.

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 differential

1 kΩ load; for example, a 1 kΩ resistor load at each IF

output, plus a differential 2 kΩ load consisting 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 2 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

IF

COMBINER

+135o

RXON

IFA

IFB

MGD157

Fig.3 Block diagram, receive section.

1995 Dec 13

5

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