Apparatus and methods for frequency tuning of rotary traveling wave oscillators (RTWOs) are provided herein. In certain configurations, distributed quantized tuning is used to tune a frequency of the RTWO. The RTWO includes a plurality of segments distributed around the RTWO's ring, and the segments include tuning capacitors and other circuitry. The distributed quantized frequency tuning is used to control the tuning capacitors in the RTWO's segments using separately controllable code values, thereby enhancing the RTWO's frequency step size or resolution. Moreover, in configurations including multiple RTWO rings that are locked to one another to reduce phase noise, the distributed quantized frequency tuning can be used to separately set the tuning capacitors across multiple RTWO rings that are coupled to one another.

There is disclosed herein clock generation circuitry, in particular rotary travelling wave oscillator circuitry. Such circuitry comprises a pair of signal lines connected together to form a closed loop and arranged such that they define at least one transition section where both said lines in a first portion of the pair cross from one lateral side of both said lines in a second portion of the pair to the other lateral side of both said lines in the second portion of the pair.

The present disclosure relates to a circuit for suppressing unwanted magnetic interference. The circuit can have a transformer having a first coil, a first pair of input terminals, and a first pair of output terminals. The transformer can produce a first magnetic field. The circuit can also have a harmonic trap. The harmonic trap can have a second coil and a second pair of input terminals operably coupled to the first pair of input terminals. The harmonic trap can produce a second magnetic field opposing the first magnetic field. The harmonic trap can suppress electrical signals of at least one of the first input terminals and the first output terminals of the transformer at a resonant frequency of the harmonic trap. The harmonic trap can also suppress the first magnetic field in a far field.

The present disclosure relates to a circuit for suppressing unwanted magnetic interference. The circuit can have a transformer having a first coil, a first pair of input terminals, and a first pair of output terminals. The transformer can produce a first magnetic field. The circuit can also have a harmonic trap. The harmonic trap can have a second coil and a second pair of input terminals operably coupled to the first pair of input terminals. The harmonic trap can produce a second magnetic field opposing the first magnetic field. The harmonic trap can suppress electrical signals of at least one of the first input terminals and the first output terminals of the transformer at a resonant frequency of the harmonic trap. The harmonic trap can also suppress the first magnetic field in a far field.

A signal generator and an associated resonator circuit are provided. The signal generator includes the resonator circuit and a core circuit. The resonator circuit further includes a first inductor (L1), a second inductor (L2), a plurality of capacitors and a switching circuit. The first inductor (L1) has a first terminal (N1) and a third terminal (N3), and the second inductor (L2) has a second terminal (N2) and a fourth terminal (N4). The switching circuit includes a first switch (S1), a second switch (S2), a third switch (S3) and a fourth switch (S4). The core circuit further includes a first inner circuit, a first outer circuit, a second inner circuit, and a second outer circuit. Configurations of these switches are adjustable and resonance caused between these terminals is changed accordingly.

A micro-electromechanical system (MEMS) frequency divider apparatus having one or more MEMS resonators on a substrate is presented. A first oscillator frequency, as an approximate multiple of the parametric oscillation frequency, is capacitively coupled from a very closely-spaced electrode (e.g., 40 nm) to a resonant structure of the first oscillator, thus inducing mechanical oscillation. This mechanical oscillation can be coupled through additional MEMS resonators on the substrate. The mechanical resonance is then converted, in at least one of the MEMS resonators, by capacitive coupling back to an electrical signal which is a division of the first oscillation frequency. Output may be generated as a single ended output, or in response to a differential signal between two output electrodes.

Techniques, circuits, and systems related to a multicore rotary traveling wave oscillator (RTWO) are provided. The multicore RTWO includes at least two metal layers and multiple RTWO cores, such that each core comprises a set of differential signal conductors that are interleaved across the metal layers to optimize space and reduce parasitic effects. The relative positional configuration of these differential signal conductors varies across a range of directionalities and/or orientations. In embodiments, an oscillator output signal is generated by the multicore RTWO; the frequency of this oscillator output signal is adjusted based on a comparison of its phase with that of a reference signal, such as within a phase locked loop circuit.

Various embodiments provide apparatuses, systems, and methods for resonant rotary clocking to generate synchronized clock signals. A base die may include a resonant ring structure to form a plurality of rotary traveling wave oscillators (RTWOs) coupled to one another in a rotary oscillator array (ROA). The ROA may provide synchronized clock signals at deterministic phase points that are tapped from the resonant ring structure. Multiple dies may be coupled to the base die (e.g., in a multi-die system) and may receive the tapped clock signals. Other embodiments may be described and claimed.