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Slow rate controlled ramp and its use in liquid crystal displays

  • US 6,670,941 B2
  • Filed: 10/22/2001
  • Issued: 12/30/2003
  • Est. Priority Date: 10/22/2001
  • Status: Expired due to Fees
First Claim
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1. A ramp source, comprising:

  • an operational transconductance amplifier (OTA) having an inverting input, a non-inverting input, an output, and a tail current line;

    a load connected to said output;

    a first current source for sinking a first current from said tail current line;

    a switch having a first terminal connected to said tail current line, a second terminal, and a switch control, wherein said first terminal and said second terminal are electrically shorted together when said switch control receives a close signal; and

    a second current source connected to said second terminal;

    wherein said second current source is for sinking a second current from said tail current line when said switch control receives said close signal.

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