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Track and hold amplifiers

  • US 10,454,591 B2
  • Filed: 05/22/2017
  • Issued: 10/22/2019
  • Est. Priority Date: 05/20/2016
  • Status: Expired due to Fees
First Claim
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1. A device, comprising:

  • an emitter follower transistor coupled to each of an input and an output;

    a charging node coupled between the output and a voltage supply, the charging node further coupled between a collector and an emitter of the emitter follower transistor; and

    a cascode switch including a first path coupled to the input and a second path coupled to the output, wherein each of the first and second paths includes a bipolar transistor and a field-effect transistor (FET), and wherein the first path and the second path are substantially symmetrical and respectively electrically passively couple the input and the output to a common node, the cascode switch configured to;

    cause the emitter follower transistor to operate in a conductive state and charge the charging node during a track mode; and

    cause the emitter follower transistor to operate in a non-conductive state to isolate the charging node from the input during a hold mode.

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