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參數(shù)資料
| 型號(hào)： | AD8346ARUZ-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 調(diào)制器/解調(diào)器 |
| 英文描述： | 800 MHz - 2500 MHz RF/MICROWAVE I/Q MODULATOR |
| 封裝： | LEAD FREE, TSSOP-16 |
| 文件頁數(shù)： | 2/20頁 |
| 文件大?。?/td> | 397K |
| 代理商： | AD8346ARUZ-REEL |
AD8346
Rev. A | Page 10 of 20
CIRCUIT DESCRIPTION
OVERVIEW
The AD8346 can be divided into the following sections: local
oscillator (LO) interface, mixer, voltage-to-current (V-to-I)
converter, differential-to-single-ended (D-to-S) converter, and
bias. A detailed block diagram of the part is shown in Figure 25.
The LO interface generates two LO signals, with 90° of phase
difference between them, to drive two mixers in quadrature.
Baseband voltage signals are converted into current form in
the V-to-I converters, feeding into two mixers. The output of
the mixers are combined to feed the D-to-S converter which
provides the 50 Ω output interface. Bias currents to each
section are controlled by the Enable (ENBL) signal. Detailed
descriptions of each section follows.
LO INTERFACE
The differential LO inputs allow the user to drive the LO differ-
entially in order to achieve maximum performance. The LO can
be driven single-endedly but the LO feedthrough performance
is degraded, especially towards the higher end of the frequency
range. The LO interface consists of interleaved stages of
polyphase network phase splitters and buffer amplifiers. The
phase-splitter contains resistors and capacitors connected in a
circular manner to split the LO signal into I and Q paths in
precise quadrature with each other. The signal on each path
goes through a buffer amplifier to make up for the loss and high
frequency roll-off. The two signals then go through another
polyphase network to enhance the quadrature accuracy. The
broad operating frequency range of 0.8 GHz to 2.5 GHz is
achieved by staggering the RC time constants in each stage of
the phase-splitters. The outputs of the second phase-splitter are
fed into the driver amplifiers for the mixers’ LO inputs.
V-TO-I CONVERTER
Each baseband input pin is connected to an op amp driving an
emitter follower. Feedback at the emitter maintains a current
proportional to the input voltage through the transistor. This
current is fed to the two mixers in differential form.
MIXERS
There are two double-balanced mixers, one for the in-phase
channel (I-channel) and one for the quadrature channel
(Q channel). Each mixer uses the gilbert cell design with four
cross-connected transistors. The bases of the transistors are
driven by the LO signal of the corresponding channel. The
output currents from the two mixers are summed together in
two resistors in series with two coupled on-chip inductors. The
signal developed across the R-L loads is sent to the D-to-S stage.
DIFFERENTIAL-TO-SINGLE-ENDED CONVERTER
The differential-to-single-ended converter consists of two
emitter followers driving a totem-pole output stage. Output
impedance is established by the emitter resistors in the output
transistors. The output of this stage is connected to the output
(VOUT) pin.
BIAS
A band gap reference circuit based on the Δ-VBE principle
generates the proportional-to-absolute-temperature (PTAT)
currents used by the different sections as references. The band
gap voltage is also used to generate a temperature-stable current
in the V-to-I converters to produce a temperature-independent
slew rate. When the band gap reference is disabled by pulling
down the ENBL pin, all other sections are shut off accordingly.
MIXER
V-TO-I
D-TO-S
BIAS CELL
AD8346
LOIN
LOIP
ENBL
QBBP
QBBN
VOUT
IBBN
IBBP
PHASE
SPLITTER
1
PHASE
SPLITTER
2
05335-025
Figure 25. Detailed Block Diagram
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD8346ARUZ-REEL1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:0.8 GHz to 2.5 GHz Quadrature Modulator |
| AD8346ARUZ-REEL7 | 功能描述:IC QUADRATURE MOD .8GHZ 16-TSSOP RoHS:是 類別:RF/IF 和 RFID >> RF 調(diào)制器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:調(diào)制器 LO 頻率:700MHz ~ 2.3GHz RF 頻率:700MHz ~ 2.3GHz P1dB:1dBm 底噪:-148dBm/Hz 輸出功率:-1dBm 電流 - 電源:46mA 電源電壓:2.7 V ~ 3.6 V 測試頻率:1.75GHz 封裝/外殼:28-WFQFN 裸露焊盤 包裝:帶卷 (TR) |
| AD8346ARUZ-REEL71 | 制造商:AD 制造商全稱:Analog Devices 功能描述:0.8 GHz to 2.5 GHz Quadrature Modulator |
| AD8346ARUZ-RL7 | 制造商:Analog Devices 功能描述:QUADRATURE MOD 70MHZ 16TSSOP - Tape and Reel |
| AD8346EVAL | 制造商:AD 制造商全稱:Analog Devices 功能描述:0.8 GHz to 2.5 GHz Quadrature Modulator |
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