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| 型号： | ADL5357ACPZ-R7 |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 混频器 |
| 英文描述： | 500 MHz to 1700 MHz Balanced Mixer with LO Buffer, IF Amp, and RF Balun; Package: 20 ld LFCSP 4x4mm (3.1EP; No of Pins: 20; Temperature Range: Ind |
| 中文描述： | 500 MHz - 1700 MHz RF/MICROWAVE DOUBLE BALANCED MIXER |
| 封装： | 5 X 5 MM, ROHS COMPLIANT, CP-20-5, MO-220-VHHC, LFCSP-20 |
| 文件页数： | 8/24页 |
| 文件大小： | 587K |
| 代理商： | ADL5357ACPZ-R7 |
ADL5357
Rev. 0 | Page 16 of 24
CIRCUIT DESCRIPTION
RF SUBSYSTEM
The ADL5357 consists of two primary components: the radio
frequency (RF) subsystem and the local oscillator (LO) subsystem.
The combination of design, process, and packaging technology
allows the functions of these subsystems to be integrated
into a single die, using mature packaging and interconnection
technologies to provide a high performance, low cost design
with excellent electrical, mechanical, and thermal properties.
In addition, the need for external components is minimized,
optimizing cost and size.
The single-ended, 50 Ω RF input is internally transformed to a
balanced signal using a low loss (<1 dB) unbalanced-to-balanced
(balun) transformer. This transformer is made possible by an
extremely low loss metal stack, which provides both excellent
balance and dc isolation for the RF port. Although the port can
be dc connected, it is recommended that a blocking capacitor be
used to avoid running excessive dc current through the part.
The RF balun can easily support an RF input frequency range
of 500 MHz to 1700 MHz.
The RF subsystem consists of an integrated, low loss RF balun,
passive MOSFET mixer, sum termination network, and IF
amplifier.
The resulting balanced RF signal is applied to a passive mixer
that commutates the RF input with the output of the LO subsystem.
The passive mixer is essentially a balanced, low loss switch that
adds minimum noise to the frequency translation. The only
noise contribution from the mixer is due to the resistive loss
of the switches, which is in the order of a few ohms.
The LO subsystem consists of an SPDT-terminated FET switch
and a three-stage limiting LO amplifier. The purpose of the LO
subsystem is to provide a large, fixed amplitude, balanced signal
to drive the mixer independent of the level of the LO input.
A block diagram of the device is shown in Figure 51.
Because the mixer is inherently broadband and bidirectional, it
is necessary to properly terminate all the idler (M × N product)
frequencies generated by the mixing process. Terminating the
mixer avoids the generation of unwanted intermodulation
products and reduces the level of unwanted signals at the input
of the IF amplifier, where high peak signal levels can compromise
the compression and intermodulation performance of the system.
This termination is accomplished by the addition of a sum
network between the IF amplifier and the mixer and also in
the feedback elements in the IF amplifier.
2
3
1
20
19
18
17
16
6
7
8
9
10
4
5
14
13
15
12
BIAS
GENERATOR
VPIF
RFIN
RFCT
COMM
LOI2
VPSW
VGS1
VGS0
LOI1
IFGM
IFOP
IFON
PWDN
LEXT
VLO3
LGM3
VLO2
LOSW
NC
ADL5357
NC = NO CONNECT
11
0
808
1-
0
01
The IF amplifier is a balanced feedback design that simultaneously
provides the desired gain, noise figure, and input impedance that are
required to achieve the overall performance. The balanced open-
collector output of the IF amplifier, with impedance modified
by the feedback within the amplifier, permits the output to be
connected directly to a high impedance filter, differential amplifier,
or an analog-to-digital input while providing optimum second-
order intermodulation suppression. The differential output
impedance of the IF amplifier is approximately 200 Ω. If operation
in a 50 Ω system is desired, the output can be transformed to
50 Ω by using a 4:1 transformer.
Figure 51. Simplified Schematic
The intermodulation performance of the design is generally
limited by the IF amplifier. The IP3 performance can be optimized
by adjusting the IF current with an external resistor. Figure 41,
Figure 43, and Figure 44 illustrate how various IF and LO bias
resistors affect the performance with a 5 V supply. Additionally,
dc current can be saved by increasing either or both resistors. It
is permissible to reduce the dc supply voltage to as low as 3.3 V,
further reducing the dissipated power of the part. (Note that no
performance enhancement is obtained by reducing the value of
these resistors, and excessive dc power dissipation may result.)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADL5357ACPZ-WP | 制造商:AD 制造商全称:Analog Devices 功能描述:500 MHz to 1700 MHz Balanced Mixer, LO Buffer, IF Amplifier, and RF Balun |
| ADL5357-EVALZ | 功能描述:EVAL BOARD FOR ADL5357 制造商:analog devices inc. 系列:- 零件状态:有效 类型:混频器 频率:500MHz ~ 1.7GHz 配套使用产品/相关产品:ADL5357 所含物品:板 标准包装:1 |
| ADL5357-EVALZ1 | 制造商:AD 制造商全称:Analog Devices 功能描述:500 MHz to 1700 MHz Balanced Mixer, LO Buffer, IF Amplifier, and RF Balun |
| ADL5358 | 制造商:AD 制造商全称:Analog Devices 功能描述:500 MHz to 1700 MHz, Dual-Balanced Mixer, LO Buffer, IF Amplifier, and RF Balun |
| ADL5358ACPZ-R2 | 制造商:AD 制造商全称:Analog Devices 功能描述:500 MHz to 1700 MHz, Dual-Balanced Mixer, LO Buffer, IF Amplifier, and RF Balun |
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