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參數資料
| 型號： | ADL5519 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 1 MHz to 10 GHz, 50 dB Dual Log Detector/Controller |
| 中文描述： | 1兆赫至10 GHz，50分貝雙數檢波器/控制器 |
| 文件頁數： | 13/27頁 |
| 文件大?。?/td> | 479K |
| 代理商： | ADL5519 |
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Preliminary Technical Data
ADL5519
THEORY OF OPERATION
The ADL5519 is a dual-channel 6-stage demodulating
logarithmic amplifier, specifically designed for use in RF
measurement and power control applications at frequencies
up to 10 GHz. Sharing much of its design with the AD8317
logarithmic detector/controller, the ADL5519 maintains tight
intercept variability vs. temperature over a 50 dB range. Each
measurement channel offers equivalent performance to the
AD8317. The complete circuit block diagram is shown in
Figure 9.
Rev. PrB | Page 13 of 27
CHANNEL A
Log Detector
CHANNEL B
Log Detector
C
V
V
A
V
C
T
V
A
INHB
INLB
COMR
PWDN
INLA
INHA
V
V
OUTB
FBKB
OUTN
OUTP
FBKA
OUTA
BIAS
TEMP
V
OUTB
OUTA
25
26
27
28
29
30
31
32
COMR
COMR
C
C
24
23
22
21
20
19
18
17
1
2
3
4
5
6
7
8
C
C
25
26
27
28
29
30
31
32
NC
NC
Figure 9. Block Diagram
Each measurement channel is a fully differential design
and uses a proprietary, high speed SiGe process, extending
high frequency performance. Figure 10 shows the basic
diagram of the ADL5519’s channel A signal path, the
functionality is identical for channel B.
DET
DET
DET
DET
INHA
INLA
I
V
OUTA
VSTA
CLPA
I
V
Figure 10. Single Channel Block Diagram
The maximum input with ±1 dB log-conformance error is
typically 0 dBm (re: 50
Ω
). The noise spectral density referred
to the input is 1.15 nV/
√
Hz, which is equivalent to a voltage of
118 μV rms in a 10.5 GHz bandwidth or a noise power of 66
dBm (re: 50
Ω
). This noise spectral density sets the lower limit
of the dynamic range. However, the low end accuracy of the
ADL5519 is enhanced by specially shaping the demodulating
transfer characteristic to partially compensate for errors due to
internal noise. The common pin, COMR, provides a quality low
impedance connection to the printed circuit board (PCB) ground.
The package paddle, which is internally connected to the
COMR pin, should also be grounded to the PCB to reduce
thermal impedance from the die to the PCB.
The logarithmic function is approximated in a piecewise
fashion by six cascaded gain stages. (For a more comprehensive
explanation of the logarithm approximation, please refer to the
AD8307 data sheet, available at www.analog.com.) The cells
have a nominal voltage gain of 9 dB each and a 3 dB bandwidth
of 10.5 GHz. Using precision biasing, the gain is stabilized over
temperature and supply variations. The overall dc gain is high,
due to the cascaded nature of the gain stages. An offset
compensation loop is included to correct for offsets within the
cascaded cells. At the output of each of the gain stages, a square-
law detector cell is used to rectify the signal.
The RF signal voltages are converted to a fluctuating differential
current having an average value that increases with signal level.
Along with the six gain stages and detector cells, an additional
detector is included at the input of each measurement channel,,
providing a 50 dB dynamic range in total. After the detector
currents are summed and filtered, the following function is
formed at the summing node:
I
D
× log
10
(
V
IN
/
V
INTERCEPT
)
where:
I
D
is the internally set detector current.
V
IN
is the input signal voltage.
V
INTERCEPT
is the intercept voltage (that is, when
V
IN
=
V
INTERCEPT
,
the output voltage would be 0 V if it were capable of going to 0 V).
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參數描述 |
|---|---|
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| ADL5519ACPZ-WP | 制造商:Analog Devices 功能描述:KHZ TO 10 GHZ, 62 DB DUAL LOG DETECTOR/CONTROLLER - Trays |
| ADL5519-EVALZ | 制造商:Analog Devices 功能描述:DUAL LOG DETECTOR/CNTRLR DUAL 5.5V - Bulk 制造商:Analog Devices 功能描述:EVAL BOARD, ADL5519 LOG DETECTOR/CTRL, Silicon Manufacturer:Analog Devices, Sili 制造商:Analog Devices 功能描述:EVAL BOARD, ADL5519 LOG DETECTOR/CTRL, Silicon Manufacturer:Analog Devices, Silicon Core Number:ADL5519, Kit Application Type:RF / IF, Kit Contents:Eval Board ADL5519, Features:(Not Applicable) |
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