High Speed Differential Amplifier in a Active Balun Configuration Evaluation Board


This relatively simple board is intended to provide a quick means to test the performance of the active balun configuration using the ISL55210. While all wideband, voltage feedback (VFA), fully differential amplifiers (FDA) can perform a single ended input to differential output operation, the frequency span for acceptable input match (or low return loss) is greatly enhanced by the >1.5GHz common mode loop bandwidth internal to the ISL55210.

Quickly evaluate performance for a breakthrough new amplifier type.

  • AC coupled single ended input with a wideband “active” impedance match
  • Convert to differential in the ISL55210 to give a very broadband “balun” operation
  • Extremely low input referred noise for a matched input using the much lower resistor setting of the active match
  • Exceptional OIP3 for 115mW device. At a doubly terminated 50Ω load, OIP3> 40dBm through 200Mhz

This board offers considerable flexibility in the input match and gain by simply changing 4 resistor values. It also offers several possible output interfaces to either get single ended or run differential output. As delivered, the default configuration delivers a -

  • 50ohm input impedance with >34dB return loss from 1Mhz to 400Mhz
  • Single ended input to single ended measurement output with 10.2dB gain and -1dB span from 3Mhz to 800Mhz
  • Input noise figure <7.5dB referenced to a 50Ω source.

Key Features

  • Easily settable gain and input impedance (change only 4 resistors)
  • Wideband output balun for easy single ended response measurements
  • Excellent simulation model available in iSim PE
  • Optional differential output port for FDA only response


  • IF receiver chains needing the smallest size single to differential solution
  • Ultrasound catheter systems needing flexible, wideband input match
  • MRI systems requiring single to differential with no magnetic elements
  • Lower frequency HF receivers needing the lowest power with exceptional dynamic range

Related Evaluation Platforms

ISL55210-ABEVAL1Z Active Balun Configured High Speed Differential Amp Eval Board

ISL55210-ABEVAL1Z Active Balun Configured High Speed Differential Amp Eval Board

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ツール発注型名 Production Status メーカー シングルツール推奨価格
説明 ディストリビュータ在庫数 ディストリビュータ お問合せ/ご購入
ISL55210-ABEVAL1Z 量産中 Renesas $49.50 1 3 Digi-Key
3 Mouser


Disclaimer: THIS MATERIAL IS PROVIDED “AS-IS” FOR EVALUATION PURPOSES ONLY. RENESAS ELECTRONICS CORPORATION AND ITS SUBSIDIARIES (collectively, “Renesas”) DISCLAIM ALL WARRANTIES, INCLUDING WITHOUT LIMITATION, FITNESS FOR A PARTICULAR PURPOSE AND MERCHANTABILITY. Renesas provides evaluation platforms and design proposals to help our customers to develop products. However, factors beyond Renesas' control, including without limitation, component variations, temperature changes and PCB layout, could significantly affect the product performance. It is the user’s responsibility to verify the actual circuit performance.