Transformer based lctank structure

A transformer for an oscillator, comprising:

• a first winding being a first planar metal winding and constructed in a preset solid region, the preset solid region comprises a first level and a second level, each of the first level and the second level includes a left side region and a right side region, wherein the first winding is wound from a first end in the left side region of the first level, guided across a first center line and through the right side region of the second level, and wound in the left side region of the second level until reaches a second end in the left side region of the second level;
• and
• a second winding being a second planar metal winding and constructed in the preset solid region, the second winding being wound from a first end in the right side region of the second level, guided across the first center line and through the left side region of the second level, and wound in the right side region of the first level until reaches a second end in the right side region of the first level;
• wherein
• the first winding has a first center tap disposed along a second center line and in the right side region of the second level, and the second winding has a second center tap disposed along the second center line and in the left side region of the second level.