100-MHz, 1 A Output current driver reference design for high capacitive load applications


Design files


This reference design uses the THS3491 high-speed, high-voltage current feedback amplifier to demonstrate an output current drive capability of greater than 1 A into a low-resistive or high-capacitive load while maintaining a large signal bandwidth of 100 MHz at 20 VPP. The high output current drive is achieved by using two or more THS3491 amplifiers in load sharing configuration to optimize large-signal bandwidth and distortion performance. THS3491 enables high-capacitive load applications because of the 900-MHz BW and ±420 mA of linear output-current drive capability. The design utilizes the VQFN-16 (RGT) package due to the best large signal bandwidth, low distortion and optimal thermal performance.

  • Output current drive ≥ 1 A
  • High capacitive load drive of 100 to 1000 pF
  • 20 Vpp output voltage swing at 100 MHz, RL = 20 Ω
  • 20 Vpp output voltage swing at 30 MHz, RS = 20 Ω and CL = 1 nF
  • Large signal bandwidth > 100 MHz
  • Flexibility for output current drive (two, three or four parallel amplifiers)
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUE75.PDF (1669 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers


Detailed overview of design layout for component placement

TIDRXG5.ZIP (2746 K)

Files used for 3D models or 2D drawings of IC components

TIDCEZ0.ZIP (3799 K)

Design file that contains information on physical board layer of design PCB

TIDRXG6.PDF (1976 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

High-speed op amps (GBW ≥ 50 MHz)

THS3491900-MHz high-power-output current-feedback amplifier

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide 100-MHz, 1 A Output Current Driver Reference Design Nov. 02, 2018

Related design resources

Reference designs

TIDA-00023 Reference Design for Implementation of the Load Sharing Concept for Large-Signal Applications

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