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LC-tank oscillator having intrinsic low-pass filter

  • US 10,425,038 B2
  • Filed: 09/11/2016
  • Issued: 09/24/2019
  • Est. Priority Date: 10/14/2015
  • Status: Active Grant
First Claim
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1. An oscillator for generating oscillation signals at two output terminals, comprising:

  • an inductor coupled between the two output terminals;

    a capacitor coupled between the two output terminals;

    two P-type transistors, wherein source electrodes of the two P-type transistors are coupled to a supply voltage, and gate electrodes of the two P-type transistors are coupled to the two output terminals, respectively; and

    two N-type transistors, wherein gate electrodes of the two N-type transistors are coupled to the two output terminals, respectively, and drain electrodes of the two N-type transistors are directly connected to drain electrodes of the two P-type transistors, respectively;

    wherein the drain electrodes of the two N-type transistors are directly connected to two internal nodes of the inductor; and

    the capacitor and a portion of the inductor form a low-pass filter for filtering an unwanted frequency component.

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