Multiphase output oscillator

A multiphase oscillator comprising:

• a plurality of serially coupled oscillator circuits connected together in a loop circuit, each particular oscillator circuit having a coupling to its serial successor oscillator circuit in the loop circuit so that all of the oscillator circuits, at the same time, provide adjustment of frequency and/or phase of an oscillation signal of its successor oscillator circuit dependent upon a difference between the phase of the oscillation signal in the successor oscillator circuit and the phase of an oscillation signal in the particular oscillator circuit, so as to maintain, in operation, the phase difference.

A multiphase output oscillator comprising:

• a plurality of oscillator sub-circuits serially coupled together in a first loop;
• each of the oscillator sub-circuits comprising an odd number of inverters coupled together to form a respective second loop of serially coupled inverters;
• each particular oscillator sub-circuit having at least a first one of its inverters in common with a respective serial predecessor oscillator sub-circuit of that particular oscillator sub-circuit in the first loop, and having at least a second one of its inverters, different from the first one, in common with a respective serial successor oscillator sub-circuit of that particular oscillator sub-circuit in the first loop.

A multiphase output oscillator comprising:

• a plurality of oscillator sub-circuits serially coupled together in a first loop;
• each of the oscillator sub-circuits comprising a first inverter coupled in a respective series circuit with a second inverter of its oscillator sub-circuit and a first inverter of one adjacent oscillator sub-circuit in the first loop to form a respective second loop including an odd number of serially coupled, inverters, and wherein said first inverter is serially coupled with first and second inverters of a second adjacent oscillator sub-circuit in the first loop to form a further second loop including an odd number of serially coupled inverters.