Inductance enhanced rotary traveling wave oscillator circuit and method
AssigneeAnalog Devices, Inc.
InventorsAndrey Martchovsky, Stephen Beccue, Anh Pham
Life of this patent
Estimating the term…
Abstract
A plurality of inductance enhanced interweaved rotary traveling wave oscillators (RTWO) is disclosed. Portions of the transmission line conductors are increased in length and run in parallel. Because the currents in these portions travel in the same direction, the inductance of these inductors is increased. By controlling the length of the transmission line conductors in these areas compared to the lengths where the currents in the oscillators travel in opposite directions, the overall impedance of the oscillators can be increased. Increased impedance leads to lower power and lower phase noise for the oscillators. Additionally, the interweaved oscillators are phase-locked to each other.
Claims20
Interleaved rotary traveling wave oscillators comprising:
- a first rotary traveling wave oscillator (RTWO) that includes a first pair of conductors and a first crossover, said first pair of conductors connected with the first crossover to form a first closed loop;
- and
- a second rotary traveling wave oscillator (RTWO) that includes a second pair of conductors and a second crossover, said second pair of conductors connected with the second crossover to form a second closed loop;
- wherein the second closed loop occupies approximately the same physical area as the first closed loop;
- and
- wherein the conductors of said first and second crossovers are spaced apart and parallel to each other over a sufficient length that the inductance of the crossovers is increased,
- wherein the first and second pairs of conductors are interleaved such that the first and second RTWOs are coupled to one another by magnetic fields.
Interleaved rotary traveling wave oscillators comprising:
- a first rotary traveling wave oscillator (RTWO) that includes a first pair of conductors and a first crossover, said first pair of conductors connected with the first crossover to form a first closed loop;
- and
- a second rotary traveling wave oscillator (RTWO) that includes a second pair of conductors and a second crossover, said second pair of conductors connected with the second crossover to form a second closed loop;
- wherein the second closed loop occupies approximately the same physical area as the first closed loop;
- and
- wherein the conductors of said first and second crossovers are spaced apart and parallel to each other over a sufficient length that the inductance of the crossovers is increased,
- wherein any currents flowing in the parallel conductors of the crossovers flow in the same direction.
Interleaved rotary traveling wave oscillators comprising:
- a first rotary traveling wave oscillator (RTWO) that includes a first pair of conductors and a first crossover, said first pair of conductors connected with the first crossover to form a first closed loop;
- and
- a second rotary traveling wave oscillator (RTWO) that includes a second pair of conductors and a second crossover, said second pair of conductors connected with the second crossover to form a second closed loop;
- wherein the second closed loop occupies approximately the same physical area as the first closed loop;
- and
- wherein the conductors of said first and second crossovers are spaced apart and parallel to each other over a sufficient length that the inductance of the crossovers is increased,
- wherein the conductors of the first and second crossovers are disposed over a ground plane and laterally adjacent to each other.
An integrated circuit comprising:
- a first rotary traveling wave oscillator (RTWO) including a first pair of conductors and a first crossover, wherein the first pair of conductors is connected with the first crossover to form a first closed loop;
- and
- a second RTWO including a second pair of conductors and a second crossover, wherein the second pair of conductors is connected with the second crossover to form a second closed loop,
- wherein the second closed loop occupies substantially the same area as the first closed loop, and
- wherein the first and second pairs of conductors are interleaved such that they share electro-magnetic (EM) fields generated by each other.
A method of generating a plurality of traveling waves, the method comprising:
- generating a first traveling wave using a first rotary traveling wave oscillator (RTWO), wherein the first RTWO includes a first pair of conductors and a first crossover, wherein the first pair of conductors is connected with the first crossover to form a first closed loop;
- and
- generating a second traveling wave using a second RTWO, wherein the second RTWO includes a second pair of conductors and a second crossover, wherein the second pair of conductors is connected with the second crossover to form a second closed loop, wherein the second closed loop occupies substantially the same area as the first closed loop,
- wherein the first and second pair of conductors are interleaved such that they share electro-magnetic (EM) fields generated by each other.
Dependencies are inferred from the claim text.