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UAA2077CM-T

更新时间： 2024-02-25 17:20:38

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恩智浦 - NXP		/
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UAA2077CM-T 数据手册

Philips Semiconductors

Product speciﬁcation

2 GHz image rejecting front-end

UAA2077BM

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 V_CCfor

the DC current should be achieved via tuning inductors.

The output voltage is limited to V_CC+ 3V_beor 3 diode

forward voltage drops.

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.

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

controlled by the hardware input RXON.

Balanced signal interfaces are used for minimizing

crosstalk due to package parasitics.

handbook, full pagewidth

+45

amplifier

MIXER

CCLNA

IFA

RFINA

RFINB

COMBINER

IFB

LNA

LNAGND

amplifier

+135

MGD157

RXON

LOIN

Fig.3 Block diagram, receive section.

1995 Dec 13

1 2 3 456 7 8...16

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