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參數(shù)資料
| 型號(hào)： | UAA2077 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 2 GHz image rejecting front-end |
| 中文描述： | 2 GHz的形象拒絕前端 |
| 文件頁(yè)數(shù)： | 6/16頁(yè) |
| 文件大?。?/td> | 140K |
| 代理商： | UAA2077 |
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1995 Dec 13
6
Philips Semiconductors
Product specification
2 GHz image rejecting front-end
UAA2077BM
Local oscillator section
The local oscillator (LO) input directly drives the two
internal all-pass networks to provide quadrature LO to the
receive mixers.
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
QUADLO
and V
CC
. Over
25 dB of image rejection can be obtained by an optimum
resistor value.
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.
Transmit mixer
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 IF outputs are high-impedance (open-collector type).
Typical application will load the output with a differential
500
load; for example, a 500
resistor load, connected
to V
CC
for DC path, at each TX output, plus a differential
1 k
consisting of the input impedance of the matching
network for the following TX part. The mixer can also be
used for frequency up-conversion.
Fast switching ON/OFF, of the transmit section is
controlled by the hardware input TXON.
Fig.4 Block diagram, LO section.
handbook, halfpage
MGD156
LOINB
to TX
to RX
LOINA
QUAD
VQUADLO
LOGND
VCCLO
Fig.5 Block diagram, transmit mixer.
handbook, halfpage
MGD153
TXINA
TXINB
TXON
LOIN
TX MIXER
TXOA
TXOB
Table 1
Control of power status
EXTERNAL PIN LEVEL
CIRCUIT MODE OF OPERATION
TXON
RXON
SXON
LOW
LOW
HIGH
LOW
LOW
HIGH
HIGH
HIGH
LOW
HIGH
LOW
LOW
HIGH
LOW
HIGH
HIGH
LOW
LOW
LOW
HIGH
HIGH
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
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| UAA2077AM | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Image rejecting front-end for DECT applications |
| UAA2077BM | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:2 GHz image rejecting front-end |
| UAA2077CM | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:2 GHz image rejecting front-end |
| UAA2077TS | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:2 GHz image rejecting front-end |
| UAA2077TS/D | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:2 GHz image rejecting front-end |
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