Crystal Oscillator Stabilization Circuit With Adjustable Bias Timing
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Solution Overview
Problem
Conventional oscillation stabilization circuits are unable to control the stabilization time of oscillation signals generated by crystal oscillators, leading to inefficient CPU operation due to prolonged stabilization times and inaccurate detection of stabilization time.
Innovation Solution
An oscillation stabilization detecting circuit that adjusts the bias current to control the charging time of a capacitor, allowing for earlier detection of oscillation signal stabilization and notification to the CPU, comprising a T flip flop, pulse control unit, oscillation stabilization detecting unit with transistors and mirroring sections, and a comparator to output a stabilization signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the conventional oscillation stabilization detecting circuit is used, then the oscillation signal can be detected, but the stabilization time cannot be controlled and is prolonged
Solution Approach 1:
The patent changes the parameter of bias current to control the charging time of the capacitor. By adjusting the bias current magnitude, the charging time constant is modified, which directly controls when the stabilization signal is generated. This resolves the contradiction by making stabilization time controllable through parameter adjustment rather than fixed by circuit design.
2Measurement precision
If the conventional oscillation stabilization detecting circuit is used, then the oscillation signal can be detected, but accurate stabilization time cannot be noticed to the CPU
Solution Approach 1:
The patent implements a feedback mechanism where the detected stabilization time information is communicated back to the CPU. The circuit generates a stabilization signal that indicates the precise moment when oscillation stabilization is achieved, and this timing information is fed back to the CPU to optimize its operation scheduling, thereby preventing information loss about stabilization timing.
3Productivity
If the conventional oscillation stabilization detecting circuit is used, then the circuit structure is simple, but the CPU operational efficiency is degraded
Solution Approach 1:
The patent performs preliminary detection of oscillation stabilization and provides advance notice to the CPU before the CPU begins operations that depend on stable oscillation. This preliminary action allows the CPU to optimize its scheduling and avoid wasting time waiting for stabilization or operating with unstable signals, thereby improving overall operational efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables the advancement of oscillation signal stabilization time, allowing for accurate detection and notification to the CPU, thereby enhancing CPU operational efficiency by reducing wasted time and improving stabilization time accuracy.
Implementation Method 1
an oscillation stabilization detecting unit including a capacitor charged with the signal output from the pulse control unit
Implementation Method 2
a T flip flop receiving a pulse-type oscillation signal generated by oscillating a crystal oscillator and then dividing the oscillation signal to output
Implementation Method 3
a T flip flop receiving a pulse-type oscillation signal generated by oscillating a crystal oscillator
Data Source
AI summary
An oscillation stabilization detecting circuit comprises a T flip flop receiving a pulse-type oscillation signal generated by oscillating a crystal oscillator and then dividing the oscillation signal to output; a pulse control unit including inverters and transistors, the pulse control unit converting the signal output from the T flip flop into a pulse-type signal starting from a high level and then outputting the converted signal; and an oscillation stabilization detecting unit including a capacitor charged with the signal output from the pulse control unit; and a plurality of transistors. The oscillation stabilization detecting unit controls charging time of the capacitor by adjusting a bias current and, after the charging time passes, outputs a stabilization signal to a CPU, the stabilization signal representing that the oscillation signal is stabilized.