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Open loop bandwidth test architecture and method for phase locked loop (PLL)

  • US 7,265,633 B1
  • Filed: 05/19/2005
  • Issued: 09/04/2007
  • Est. Priority Date: 06/14/2004
  • Status: Active Grant
First Claim
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1. A phase locked loop (PLL) circuit, comprising:

  • a test loop filter, comprisinga resistor-capacitor (RC) network coupled to a control node coupled to a voltage controlled oscillator (VCO), anda test leg coupled to the RC network that includes a test resistance, and at least one test controllable impedance path in series with the test resistance that provides a high impedance in a non-test mode and a low impedance in a test mode.

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