Balance Restoring Phase Noise Filter for Complementary Oscillator Circuitry

Oscillator circuitry comprising:

• a pair of cross-coupled n-type transistors coupled to a first tail node;
• a pair of cross-coupled p-type transistors coupled to a second tail node;
• a first 1:1 impedance transformer coupled to the first tail node;
• and
• a first tunable single-ended capacitor coupled to the first 1:1 impedance transformer.

Circuitry comprising:

• a pair of n-type transistors coupled to a first tail node;
• a pair of p-type transistors coupled to a second tail node, wherein the pair of n-type transistors and the pair of p-type transistors exhibit unbalanced characteristics;
• a load inductor coupled between the pair of n-type transistors and the pair of p-type transistors;
• a load capacitor coupled in parallel with the load inductor;
• and
• a phase noise filter configured to reduce a phase noise of the circuitry and coupled between the first and second tail nodes, wherein the phase noise filter comprises at least first and second single-ended capacitors configured to restore a balance between the pair of n-type transistors and pair of p-type transistors.