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Transconductance amplifier having sensfets which drive a load with linearly proportional current

  • US 5,191,297 A
  • Filed: 07/25/1991
  • Issued: 03/02/1993
  • Est. Priority Date: 07/25/1991
  • Status: Expired due to Fees
First Claim
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1. A transconductance amplifier which drives a load with current which is linearly proportional to an input signal comprising:

  • two sensfet semiconductor devices, each having a source pin, a drain pin, a gate pin, a mirror pin, and a Kelvin pin, said sensfet devices being of the type in which the current flowing between said source and said drain is controlled by said gate pin, and the current from said mirror pin is a small fraction of the current between said source pin and said drain pin;

    a source of power current for each of said sensfet devices, each source of current and said load being connected with said source pins and said drain pins so that said sensfet devices control the flow of current through said load, said sensfet devices being connected as an H bridge amplifier with said load being connected between the drain pins of said sensfet devices;

    said input signal being applied to said gate pins;

    source means for producing a sense current connected to said mirror pins, said sense current being linearly proportional to said current through said load; and

    negative feedback means connected between said source of sense current and said gate pins to apply negative feedback to said gate pins to maintain the current flow through said load linearly proportional to said input voltage.

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