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參數(shù)資料
| 型號： | ADL5372ACPZ-R2 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 調制器/解調器 |
| 英文描述： | 1500 MHz - 2500 MHz RF/MICROWAVE QUADRAPHASE MODULATOR |
| 封裝： | LEAD FREE, MO-220VGGD-2, LFCSP-24 |
| 文件頁數(shù)： | 3/24頁 |
| 文件大?。?/td> | 802K |
| 代理商： | ADL5372ACPZ-R2 |
ADL5372
Rev. 0 | Page 11 of 24
THEORY OF OPERATION
CIRCUIT DESCRIPTION
Overview
The ADL5372 can be divided into five circuit blocks: the LO
interface, the baseband voltage-to-current (V-to-I) converter,
the mixers, the differential-to-single-ended (D-to-S) stage, and
the bias circuit. A detailed block diagram of the device is shown
in Figure 24.
PHASE
SPLITTER
OUT
LOIP
LOIN
IBBP
IBBN
QBBP
QBBN
Σ
0
65
11
-0
24
Figure 24. Block Diagram
The LO interface generates two LO signals in quadrature. These
signals are used to drive the mixers. The I and Q baseband input
signals are converted to currents by the V-to-I stages, which
then drive the two mixers. The outputs of these mixers combine
to feed the output balun, which provides a single-ended output.
The bias cell generates reference currents for the V-to-I stage.
LO Interface
The LO interface consists of a polyphase quadrature splitter
followed by a limiting amplifier. The LO input impedance is set
by the polyphase. The LO can be driven either single-ended or
differentially. When driven single-ended, the LOIN pin should
be ac grounded via a capacitor. Each quadrature LO signal then
passes through a limiting amplifier that provides the mixer with
a limited drive signal.
V-to-I Converter
The differential baseband inputs (QBBP, QBBN, IBBN, and
IBBP) consist of the bases of PNP transistors, which present a
high impedance. The voltages applied to these pins drive the
V-to-I stage that converts baseband voltages into currents. The
differential output currents of the V-to-I stages feed each of their
respective Gilbert-cell mixers. The dc common-mode voltage at
the baseband inputs sets the currents in the two mixer cores.
Varying the baseband common-mode voltage influences the
current in the mixer and affects overall modulator performance.
The recommended dc voltage for the baseband common-mode
voltage is 500 mV dc.
Mixers
The ADL5372 has two double-balanced mixers: one for the
in-phase channel (I-channel) and one for the quadrature
channel (Q-channel). Both mixers are based on the Gilbert-cell
design of four cross-connected transistors. The output currents
from the two mixers sum together into a load. The signal
developed across this load is used to drive the D-to-S stage.
D-to-S Stage
The output D-to-S stage consists of an on-chip balun that
converts the differential signal to a single-ended signal. The
balun presents high impedance to the output (VOUT). Hence, a
matching network may be needed at the output for optimal
power transfer.
Bias Circuit
An on-chip band gap reference circuit is used to generate a
proportional-to-absolute temperature (PTAT) reference current
for the V-to-I stage.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADL5372ACPZ-R21 | 制造商:AD 制造商全稱:Analog Devices 功能描述:1500 MHz to 2500 MHz Quadrature Modulator |
| ADL5372ACPZ-R7 | 功能描述:IC QUADRA MOD 1.5/2.5GHZ 24LFCSP RoHS:是 類別:RF/IF 和 RFID >> RF 調制器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 功能:調制器 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) |
| ADL5372ACPZ-R71 | 制造商:AD 制造商全稱:Analog Devices 功能描述:1500 MHz to 2500 MHz Quadrature Modulator |
| ADL5372ACPZ-WP | 制造商:Analog Devices 功能描述:QUADRATURE MOD 700MHZ 24LFCSP EP - Waffle Pack |
| ADL5372ACPZ-WP1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:1500 MHz to 2500 MHz Quadrature Modulator |
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