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UAA2077CM-T

更新时间： 2024-01-18 07:50:08

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恩智浦 - NXP		/
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中文翻译

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数据手册

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UAA2077CM-T 数据手册

Philips Semiconductors

Product speciﬁcation

2 GHz image rejecting front-end

UAA2077BM

Local oscillator section

Transmit mixer

The local oscillator (LO) input directly drives the two

internal all-pass networks to provide quadrature LO to the

receive mixers.

This mixer is used for down-conversion to the transmit IF.

Its inputs are coupled to the transmit RF which is

down-converted to a modulated transmit IF frequency,

phase-locked with the baseband modulation.

The centre frequency of the receive band is adjustable by

the voltage on pin V_QUADLO. This should be achieved by

connecting a resistor between V_QUADLOand V_CC. Over

25 dB of image rejection can be obtained by an optimum

resistor value.

The IF outputs are high-impedance (open-collector type).

Typical application will load the output with a differential

500 Ω load; for example, a 500 Ω resistor load, connected

to V_CCfor DC path, at each TX output, plus a differential

1 kΩ consisting of the input impedance of the matching

network for the following TX part. The mixer can also be

used for frequency up-conversion.

A synthesizer-ON mode (SX mode) is used to power-up all

LO input buffers, thus minimizing the pulling effect on the

external VCO when entering the receive or transmit mode.

This mode is active when SXON = 1.

Fast switching ON/OFF, of the transmit section is

controlled by the hardware input TXON.

to RX

handbook, halfpage

TX MIXER

CCLO

TXOA

TXOB

LOIN

QUAD

QUADLO

LOGND

MGD153

to TX

TXON

TXINB TXINA

MGD156

LOINA LOINB

Fig.4 Block diagram, LO section.

Fig.5 Block diagram, transmit mixer.

Table 1 Control of power status

EXTERNAL PIN LEVEL

CIRCUIT MODE OF OPERATION

TXON

RXON

SXON

LOW

HIGH

LOW

HIGH

LOW

HIGH

LOW

HIGH

LOW

HIGH

LOW

HIGH

LOW

HIGH

power-down mode

RX mode, f_LO< f_RF: receive section and LO buffers to RX on

TX mode: transmit section and LO buffers to TX on

SX mode: complete LO section on

SRX mode, f_LO< f_RF: receive section on and SX mode active

STX mode: transmit section on and SX mode active

RX mode, f_LO> f_RF: receive section and LO buffers to RX on

SRX mode, f_LO> f_RF: receive section on and SX mode active

1995 Dec 13

1...3 4 567 8 9...16

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