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參數資料
| 型號： | THS3201DGNRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| 封裝： | GREEN, PLASTIC, MSOP-8 |
| 文件頁數： | 11/37頁 |
| 文件大小： | 1116K |
| 代理商： | THS3201DGNRG4 |
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PRINTED CIRCUIT BOARD LAYOUT
www.ti.com ............................................................................................................................................................. SLOS416C – JUNE 2003 – REVISED JUNE 2009
with a low parasitic capacitance shunting the
TECHNIQUES FOR OPTIMAL
external resistors, excessively high resistor values
PERFORMANCE
can create significant time constants that can
degrade performance. Good axial metal-film or
Achieving optimum performance with high frequency
surface-mount
resistors
have
approximately
amplifier-like devices in the THS3201 requires careful
0.2 pF in shunt with the resistor. For resistor
attention to board layout parasitic and external
values >2.0 k
this parasitic capacitance can add
component types.
a pole and/or a zero that can affect circuit
operation.
Keep
resistor
values
as
low
as
Recommendations that optimize performance include:
possible,
consistent
with
load
driving
Minimize parasitic capacitance to any power or
considerations.
ground plane for the negative input and output
Connections to other wideband devices on the
pins by voiding the area directly below these pins
board may be made with short direct traces or
and connecting traces and the feedback path.
through onboard transmission lines. For short
Parasitic capacitance on the output and negative
connections, consider the trace and the input to
input
pins
can
cause
instability.
To
reduce
the next device as a lumped capacitive load.
unwanted capacitance, a window around the
Relatively wide traces (50 mils to 100 mils) should
signal I/O pins should be opened in all of the
be used, preferably with ground and power planes
ground and power planes around those pins and
opened up around them. Estimate the total
the feedback path. Otherwise, ground and power
capacitive load and determine if isolation resistors
planes should be unbroken elsewhere on the
on the outputs are necessary. Low parasitic
board.
capacitive loads (< 4 pF) may not need an RS
Minimize the distance (<0.25") from the
since the THS3201 is nominally compensated to
power-supply pins to high frequency 0.1-
F and
operate with a 2-pF parasitic load. Higher parasitic
100 pF decoupling capacitors. At the device pins,
capacitive loads without an RS are allowed as the
the ground and power-plane layout should not be
signal gain increases (increasing the unloaded
in close proximity to the signal I/O pins. Avoid
phase margin). If a long trace is required, and the
narrow power and ground traces to minimize
6-dB signal loss intrinsic to a doubly-terminated
inductance between the pins and the decoupling
transmission line is acceptable, implement a
capacitors. The power-supply connections should
matched
impedance
transmission
line
using
always
be
decoupled
with
these
capacitors.
microstrip or stripline techniques (consult an ECL
Larger (6.8
F or more) tantalum decoupling
design handbook for microstrip and stripline layout
capacitors, effective at lower frequency, should
techniques).
also be used on the main supply pins. These may
A 50- environment is not necessary onboard,
be placed somewhat farther from the device and
and in fact, a higher impedance environment
may be shared among several devices in the
improves distortion as shown in the distortion
same area of the printed circuit board (PCB). The
versus load plots. With a characteristic board
primary goal is to minimize the impedance seen in
trace impedance based on board material and
the differential-current return paths. For driving
trace dimensions, a matching series resistor into
differential loads with the THS3201, adding a
the trace from the output of the THS3201 is used
capacitor
between
the
power-supply
pins
as well as a terminating shunt resistor at the input
improves
2nd
order
harmonic
distortion
of the destination device.
performance. This also minimizes the current loop
formed by the differential drive.
Remember also that the terminating impedance is
the parallel combination of the shunt resistor and
Careful selection and placement of external
the input impedance of the destination device: this
components
preserve
the
high-frequency
total effective impedance should be set to match
performance of the THS3201. Resistors should be
the trace impedance. If the 6-dB attenuation of a
a
very
low
reactance
type.
Surface-mount
doubly-terminated
transmission
line
is
resistors work best and allow a tighter overall
un-acceptable,
a
long
trace
can
be
layout. Again, keep their leads and PCB trace
series-terminated at the source end only. Treat
length as short as possible. Never use wirebound
the trace as a capacitive load in this case. This
type resistors in a high frequency application.
does not preserve signal integrity as well as a
Since the output pin and inverting input pins are
doubly-terminated line. If the input impedance of
the most sensitive to parasitic capacitance, always
the destination device is low, there is some signal
position the feedback and series output resistors,
attenuation due to the voltage divider formed by
if any, as close as possible to the inverting input
the series output into the terminating impedance.
pins and output pins. Other network components,
such as input termination resistors, should be
space
placed close to the gain-setting resistors. Even
space
Copyright 2003–2009, Texas Instruments Incorporated
19
Product Folder Link(s): THS3201
相關PDF資料 |
PDF描述 |
|---|---|
| THS3201MDEP | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| THS3201MDGNEP | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| THS3201MDGNREP | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| THS3201MDREP | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| THS3202DRG4 | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| THS3201DR | 功能描述:高速運算放大器 1.8GHz Current Feedback Amplifier RoHS:否 制造商:Texas Instruments 通道數量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| THS3201DRG4 | 功能描述:高速運算放大器 1.8GHz Current Feedback Amplifier RoHS:否 制造商:Texas Instruments 通道數量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| THS3201-EP | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1.8-GHz LOW-DISTORTION CURRENT-FEEDBACK AMPLIFIER |
| THS3201EVM | 功能描述:放大器 IC 開發工具 THS3201 Eval Mod RoHS:否 制造商:International Rectifier 產品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
| THS3201MDEP(1) | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1.8-GHz LOW-DISTORTION CURRENT-FEEDBACK AMPLIFIER |
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