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Texas Instruments THS4141 manual Butterworth Filter, ±4. Multiple Feedback Filter Circuit

Models: THS4141

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2.7 Butterworth Filter

Butterworth Filter

Note:

Transformers are used to change the single ended signals to differential signal or vice versa. On this EVM, they can be populated according to the application or the experiment. The VOCM pin of the device may be connected to the center-tap of the transformer, or maybe set via an external source such

as Vref of a data converter. If the VOCM pin is not connected to an external source, it will be set at the center point of the power supply. For example, if

±5 sources are used, the VOCM level will be set to zero.

2.7 Butterworth Filter

An example of a Butterworth filter implemented with multiple feedback archi- tecture is provided. The following circuit is implemented on the EVM board. The following figures represent the circuit configuration and the component values. The corner frequency of the filter (±3dB) is set at 1 MHz.

For verification of jumper locations and other bypass components, see the complete EVM schematic in Figure 1±2.

Figure 2±4. Multiple Feedback Filter Circuit

±1 dBm

AC

787Ω

220 pF

787Ω

787 Ω
	100 pF
	VCC
732 Ω		5 V	100 Ω
	+	±
		±
732 Ω	THS4141
732 Ω	±	+
	±
		±5 V	100 Ω

VEE

100 pF

787Ω

2-6	Using the THS4141 EVM

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Texas Instruments manual Butterworth Filter, ±4. Multiple Feedback Filter Circuit, Using the THS4141 EVM

Contents

THS4141 Mixed-Signal ProductsUsers Guide EVM Users Guide for High Speed Fully Differential AmplifierIMPORTANT NOTICE Preface How to Use This ManualAbout This Manual FCC Warning Information About Cautions and WarningsRelated Documentation From Texas Instruments TrademarksContents 3 General High-Speed Amplifier Design ConsiderationsFigures TablesPage Introduction and DescriptionChapter Topic1.1 Description 1.2 Evaluation Module FeaturesIntroduction and Description THS4141 EVM Specifications 1.3 THS4141 EVM Specifications1.4 Schematic of the Populated Circuit Default Configuration Introduction and DescriptionTHS4141 EVM Schematic 1.5 THS4141 EVM SchematicFigure 1±2. Schematic Introduction and Description1.6 Additional Sample Schematics Additional Sample SchematicsFigure 1±6. Butterworth Filter With Multiple Feedback Additional Sample SchematicsFigure 1±5. VICR Level Shifter Introduction and DescriptionTHS4141 EVM Layout 1.7 THS4141 EVM LayoutIntroduction and Description TEXAS INSTRUMENTS THS4141 EVM REVBIntroduction and Description Figure 1±9. Internal Plane Layer 2 Ground PlaneFigure 1±10. Internal Plane Layer 3 ± VCC Plane THS4141 EVM LayoutIntroduction and Description Figure 1±11. Bottom Layer 4 Ground and SignalTHS4141 EVM Layout Introduction and Description Page Using the THS4141 EVMChapter TopicFigure 2±1. Power Supply Connection 2.2 Power Supply Setup2.1 Required Equipment Using the THS4141 EVMFigure 2±2. Signal Connections 2.3 Input and Output SetupUsing the THS4141 EVM Figure 2±3. Driver 1 Output Signal 2.4 Testing the EVM SetupUsing the THS4141 EVM 2.6 Measuring the Frequency Response 2.5 Power Down VerificationUsing the THS4141 EVM Using the THS4141 EVM 2.7 Butterworth FilterFigure 2±4. Multiple Feedback Filter Circuit Using the THS4141 EVM 2.8 THS4141 EVM Bill of MaterialsFigure 2±5. Gain vs Phase Table 2±1. THS4141 EVM Bill of MaterialsTable 2±1. THS4141 EVM Bill of Materials continued Using the THS4141 EVMTHS4141 EVM Bill of Materials General High-Speed Amplifier Design Considerations ChapterGeneral High-Speed Amplifier Design Considerations