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Operational filter building block

  • US 6,271,719 B1
  • Filed: 09/02/1998
  • Issued: 08/07/2001
  • Est. Priority Date: 09/02/1998
  • Status: Expired due to Term
First Claim
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1. A 3-terminal operational filter circuit comprising:

  • an input terminal for receiving an input signal from an input signal source;

    a first output terminal that provides a first frequency response in response to a first condition, said first condition comprising a resistor coupled in series between said input terminal and said input signal source, said first output terminal providing a second frequency response in response to a second condition, said second condition comprising a capacitor coupled in series between said input terminal and said input signal source;

    a second output terminal that provides said second frequency response in response to said first condition and that provides a third frequency response in response to said second condition;

    an operational amplifier having an inverting input, a non-inverting input, and an amplifier output, said inverting input coupled to said input terminal, said non-inverting input coupled to ground, and said amplifier output coupled to said second output terminal;

    a capacitor coupled in series between said inverting input and said amplifier output; and

    a non-inverting integrator having an integrator input and an integrator output, said integrator input coupled to said amplifier output, and said integrator output coupled to said first output terminal;

    wherein;

    said first, second, and third frequency responses are each selected from the group consisting of low pass, band-pass, and high pass frequency responses.

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