Inductor-capacitor oscillator with embedded second harmonic filter and associated dual core oscillator

An inductor-capacitor (LC) oscillator with an embedded second harmonic filter, comprising:

• a first transistor and a second transistor;
• a first part-one inductor and a second part-one inductor, wherein a first end of the first part-one inductor and a first end of the second part-one inductor are coupled to gate terminals of the second transistor and the first transistor, respectively;
• a part-one capacitor, coupled between the first end of the first part-one inductor and the first end of the second part-one inductor;
• a part-two inductor, coupled between a second end of the first part-one inductor and a second end of the second part-one inductor;
• and
• at least one part-two capacitor, coupled to drain terminals of the first transistor and the second transistor;
• wherein the first part-one inductor, the second part-one inductor and the part-two inductor are implemented by a continuous metal layer without segmentation.

An inductor-capacitor (LC) oscillator with an embedded second harmonic filter, comprising:

• a first transistor and a second transistor;
• a first part-one inductor and a second part-one inductor, wherein a first end of the first part-one inductor and a first end of the second part-one inductor are coupled to gate terminals of the second transistor and the first transistor, respectively;
• a part-one capacitor, coupled between the first end of the first part-one inductor and the first end of the second part-one inductor;
• a part-two inductor, coupled between a second end of the first part-one inductor and a second end of the second part-one inductor;
• at least one part-two capacitor, coupled to drain terminals of the first transistor and the second transistor;
• and
• a first part-three inductor and a second part-three inductor, wherein the first part-three inductor is coupled between the second end of the first part-one inductor and the drain terminal of the first transistor, and the second part-three inductor is coupled between the second end of the second part-one inductor and the drain terminal of the second transistor.

An inductor-capacitor (LC) oscillator with an embedded second harmonic filter, comprising:

• a first transistor and a second transistor;
• a first part-one inductor and a second part-one inductor, wherein a first end of the first part-one inductor and a first end of the second part-one inductor are coupled to gate terminals of the second transistor and the first transistor, respectively;
• a part-one capacitor, coupled between the first end of the first part-one inductor and the first end of the second part-one inductor;
• a part-two inductor, coupled between a second end of the first part-one inductor and a second end of the second part-one inductor;
• and
• at least one part-two capacitor, coupled to drain terminals of the first transistor and the second transistor;
• wherein the first transistor is a P-type transistor, the second transistor is an N-type transistor, and a first end and a second end of the at least one part-two capacitor are coupled to the drain terminals of the first transistor and the second transistor, respectively.

A dual core oscillator, comprising:

• a first inductor-capacitor (LC) oscillator and a second LC oscillator identical to each other, wherein each of the first LC oscillator and the second LC oscillator comprises:
• a first transistor and a second transistor;
• a first part-one inductor and a second part-one inductor, wherein a first end of the first part-one inductor and a first end of the second part-one inductor are coupled to gate terminals of the second transistor and the first transistor, respectively;
• a part-one capacitor, coupled between the first end of the first part-one inductor and the first end of the second part-one inductor;
• a part-two inductor, coupled between a second end of the first part-one inductor and a second end of the second part-one inductor;
• and
• at least one part-two capacitor, coupled to drain terminals of the first transistor and the second transistor;
• wherein the part-two inductor of the first LC oscillator is coupled to the part-two inductor of the second LC oscillator.

A dual core oscillator, comprising:

• an inductor-capacitor (LC) oscillator, comprising:
• a first transistor and a second transistor;
• and
• a first LC tank, comprising:
• a first part-one inductor and a second part-one inductor, wherein a first end of the first part-one inductor and a first end of the second part-one inductor are coupled to gate terminals of the second transistor and the first transistor, respectively;
• a part-one capacitor, coupled between the first end of the first part-one inductor and the first end of the second part-one inductor;
• a part-two inductor, coupled between a second end of the first part-one inductor and a second end of the second part-one inductor;
• and
• at least one part-two capacitor, coupled to drain terminals of the first transistor and the second transistor;
• and
• a second LC tank, comprising at least one inductor and at least one capacitor;
• wherein the part-two inductor of the first LC oscillator is coupled to the at least one inductor of the second LC tank.