THS4501CDG4 datasheet(34/48 Pages) TI1

34 / 48 page

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– APRIL 2002 – REVISED OCTOBER 2011

www.ti.com

THS4501 product folder on the Texas Instruments

web site, www.ti.com, or through your local Texas

Instruments sales representative. A schematic for the

evaluation board is shown in Figure 116 with the

default component values. Unpopulated footprints are

shown to provide insight into design flexibility.

Figure 115. Use of Isolation Resistors With a

Capacitive Load

POWER-SUPPLY DECOUPLING

TECHNIQUES AND RECOMMENDATIONS

Power-supply decoupling is a critical aspect of any

high-performance amplifier design process. Careful

decoupling provides higher quality ac performance

(most notably improved distortion performance). The

following guidelines ensure the highest level of

performance.

Figure 116. Simplified Schematic of the

Evaluation Board

1. Place decoupling capacitors as close to the

power-supply inputs as possible, with the goal of

minimizing the inductance of the path from

Computer simulation of circuit performance using

ground to the power supply.

SPICE

often

useful

when

analyzing

the

performance of analog circuits and systems. This

2. Placement priority should be as follows: smaller

practice is particularly true for video and RF amplifier

capacitors should be closer to the device.

circuits where parasitic capacitance and inductance

3. Use of solid power and ground planes is

can have a major effect on circuit performance. A

recommended to reduce the inductance along

SPICE model for the THS4500 family of devices is

power-supply return current paths.

available through either the Texas Instruments web

4. Recommended

values

for

power-supply

site (www.ti.com) or as one model on a disk from the

decoupling include 10-

μF and 0.1-μF capacitors

Texas

Instruments

Product

Information

Center

for each supply. A 1000-pF capacitor can be

(1-800-548-6132). The PIC is also available for

used across the supplies as well for extremely

design assistance and detailed product information at

high frequency return currents, but often is not

this number. These models do a good job of

required.

predicting small-signal ac and transient performance

under a wide variety of operating conditions. They are

EVALUATION FIXTURES, SPICE MODELS,

not intended to model the distortion characteristics of

AND APPLICATIONS SUPPORT

the amplifier, nor do they attempt to distinguish

between the package types in their small-signal ac

Texas Instruments is committed to providing its

performance. Detailed information about what is and

customers with the highest quality of applications

is not modeled is contained in the model file itself.

support. To support this goal, an evaluation board

has been developed for the THS4500 family of fully

differential amplifiers. The evaluation board can be

obtained by ordering through the THS4500 or

Submit Documentation Feedback

Product Folder Link(s): THS4500 THS4501

THS4501CDG4 Datasheet(PDF) 34 Page - Texas Instruments

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