Oscillator Clock-Edge Synchronization to Prevent Signal Glitches
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Solution Overview
Problem
Conventional oscillator circuits face issues with signal glitches due to asynchronous alignment between externally triggered power switch control signals and internally generated oscillation frequencies, leading to operation errors and poor signal quality.
Innovation Solution
An oscillator apparatus comprising an oscillator circuit and a protection circuit with an AND gate, which generates a synchronized power switch control signal to align the signal edge of the externally provided power switch control signal with the clock signal edge, using a counting circuit and flip-flops to ensure proper timing alignment, thereby preventing signal glitches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an externally triggered power switch control signal is used to control the oscillator circuit, then the oscillator can be controlled to output or stop the oscillation frequency, but the signal edge of the control signal cannot be accurately aligned with the signal edge of the generated oscillation frequency, causing signal glitches
Solution Approach 1:
The patent introduces a protection circuit as an intermediary between the external control signal and the oscillator circuit. This protection circuit includes a first power switch control signal input terminal, a second power switch control signal output terminal, and a clock signal input terminal. The protection circuit processes the external control signal through multiple logic gates (AND gate, OR gate, NOT gate) to generate a refined second power switch control signal that is properly synchronized with the oscillator's internal clock signal, thereby eliminating signal glitches while maintaining control capability.
2Device complexity
If the power switch control signal is directly applied to the oscillator circuit input terminal, then the circuit structure remains simple, but signal glitches are introduced due to asynchronous timing between control signal edge and oscillation frequency edge
Solution Approach 1:
The protection circuit performs preliminary processing on the external power switch control signal before it reaches the oscillator circuit. By using a series of logic gates (AND gate receiving clock signal and first control signal, OR gate combining multiple signals, NOT gate inverting signals), the circuit pre-synchronizes the control signal edge with the oscillation frequency edge, eliminating the harmful asynchronous timing effect before it can cause signal glitches in the oscillator circuit.
Data Source
AI summary
An oscillator apparatus includes an oscillator circuit and a protection circuit. The oscillator circuit has an input and an output for generating a clock signal. The protection circuit is coupled to the input or the output of the oscillator circuit and is used for generating a second power switch control signal to the input of the oscillator circuit according to a signal edge of the clock signal and a first power switch control signal which is provided to the oscillator apparatus, to protect circuit element(s) included within the oscillator circuit.