Reference Design for High-Gain Multistage Amplifier


Design files


Using the LMH6629 and OPA684 op amps, this reference design deals with the difficulties and limitations of developing very high gain, multistage amplifier circuits. Supported by a full scale application report including theory, simulations, board design and evaluation, this design can be easily adjusted for a given application.

  • High Voltage Gain - up to 120,000 V/V
  • High Bandwidth - Flat Band 100 kHz - 4 MHz @ 120,000 V/V
  • Low Supply Operation (+/-2.5 V)
  • Low Component Count
  • This reference design has been lab tested and is supported with design files and an application report
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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.

TIDU002.PDF (3457 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more

TIDR269.PDF (86 K)

Detailed schematic diagram for design layout and components

TIDR270.PDF (101 K)

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

TIDC004.ZIP (40 K)

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


Includes TI products in the design and potential alternatives.

High-speed op amps (GBW ≥ 50 MHz)

LMH6629Ultra-low-noise high-speed operational amplifier with shutdown

Data sheet: PDF | HTML
High-speed op amps (GBW ≥ 50 MHz)

OPA684Low-Power, Current Feedback Operational Amplifier With Disable

Data sheet: PDF

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Technical documentation

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Type Title Date
Test report TIDA-00066 Test Results Oct. 08, 2013

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