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Circuits for linear conversion between voltages and currents

  • US 5,126,685 A
  • Filed: 08/19/1991
  • Issued: 06/30/1992
  • Est. Priority Date: 12/18/1990
  • Status: Expired due to Term
First Claim
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1. A current sense amplifier, including:

  • a non-inverting amplifier having an input node and an output node;

    a voltage-to-current converter circuit, having an input node connected to the output node of said amplifier and an output node connected to the input node of said amplifier;

    a capacitor connected between said input node and said output node of said non-inverting amplifier;

    wherein said voltage-to-current converter circuit includes a P-channel MOS transistor having its drain connected to the drain of an N-channel MOS transistor to form the output node of said voltage-to-current converter circuit, and having its gate connected to the gate of said N-channel MOS transistor to form the input node of said voltage-to-current converter circuit, the source of said P-channel MOS transistor connected to a first voltage rail and the source of said N-channel MOS transistor connected to a second voltage rail, more negative than said first voltage rail.

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