Multiphase Oscillator Layout for Wide-Phase Clock Amplification
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Solution Overview
Problem
Existing rotary travelling wave oscillators face performance degradation due to the difficulty in providing clock signals with wide angular distances to amplification circuits, leading to reduced Q-factor and increased phase noise, as long wires cause losses and constrain the use of amplification circuits operating with multiple clock signal phases.
Innovation Solution
Implementing a system of adjacent phase-locked rotary travelling wave oscillators with controlled phase shifts to provide colocated clock signal phases of wide angular distances to amplification circuits, allowing for enhanced performance by using multiple clock signal phases, including quadrature signals, without the need for long wires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If long wires are used to provide clock signals with wide angular distances to amplification circuits, then the clock signals can reach the amplification circuits, but the Q-factor is reduced and phase noise increases due to losses in the long wires
Solution Approach 1:
The patent divides the oscillator system into multiple adjacent oscillators (first oscillator, second oscillator, etc.), each generating clock signals at different phases. Instead of using long wires to distribute clock signals with wide angular distances from a single oscillator, the system segments the signal generation across multiple oscillators that are phase-locked together. Each oscillator provides clock signals to nearby amplification circuits over short distances, eliminating the need for long wire connections while maintaining the ability to provide signals with wide angular distances through the phase relationships between adjacent oscillators.
2Reliability
If multiple clock signal phases with wide angular distances are provided to amplification circuits, then the figure of merit and phase noise performance can be improved, but long wires are required which cause losses and constrain circuit design
Solution Approach 1:
The patent transitions from a single-oscillator architecture to a multi-oscillator spatial arrangement, utilizing the dimensional aspect of having multiple oscillators positioned adjacent to each other. Each oscillator generates clock signals at different phases (e.g., 0°, 90°, 180°, 270°), and these phase differences are achieved through the spatial and temporal relationships between multiple oscillators rather than through long wire connections from a single source. This dimensional approach allows amplification circuits to access multiple clock phases with wide angular distances over short wire lengths.
3Loss of energy
If adjacent phase-locked oscillators with controlled phase shifts are implemented, then colocated clock signal phases of wide angular distances can be provided without long wires, but the device complexity increases
Solution Approach 1:
The patent merges multiple adjacent oscillators into a coordinated system where the oscillators are phase-locked to each other with controlled phase shifts. By combining the output of multiple oscillators that are synchronized through phase locking, the system achieves the capability to provide colocated clock signal phases with wide angular distances. The phase locking mechanism ensures that the combined system behaves as a unified source, reducing the effective complexity management while maintaining the benefits of multiple phase signals available to amplification circuits over short distances.
Data Source
Figure 1A~1B
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AI summary
Apparatus and methods for multiphase oscillators are provided. In certain implementations, an oscillator system includes a first multiphase oscillator and a second multiphase oscillator that are phase and frequency-locked. Additionally, the first and second multiphase oscillators are phase-locked by an amount of phase shift that provides colocated clock signal phases of relatively wide angular distances, which can be used by the oscillators' amplification circuits. The first and/or second multiphase oscillators include one or more amplification circuits that operate using at least one clock signal phase generated by the first multiphase oscillator and using at least one clock signal phase generated by the second multiphase oscillator.