Adjustable Oscillator Biasing for Stable Clock Frequency
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Solution Overview
Problem
Self-resonated circuits in digital electronic devices experience frequency shifts due to variations in external environments such as supply voltage, manufacturing processes, and temperature, leading to instability in oscillating frequencies.
Innovation Solution
An oscillating apparatus comprising a biasing circuit, an oscillator, an impedance device, a detecting circuit, and a selecting circuit, which dynamically adjusts the biasing signal and controls the oscillating frequency, allowing for selection between internal and external clock sources to maintain frequency stability and reject power supply noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If a self-resonated circuit is used to generate clock signals, then chip area and power consumption are reduced, but frequency stability deteriorates due to environmental variations
Solution Approach 1:
The patent applies dynamics by making the biasing current adjustable through a control circuit that dynamically modifies the current based on environmental conditions. The biasing circuit includes transistors and resistors configured to allow dynamic adjustment of the biasing current, enabling the oscillator to adapt to temperature and voltage variations while maintaining frequency stability and low power consumption.
Solution Approach 2:
The patent changes physical parameters by adjusting the biasing current to compensate for environmental variations. The control circuit monitors environmental conditions and modifies the biasing current parameter accordingly, allowing the oscillator to maintain stable frequency operation across different temperatures and supply voltages without increasing power consumption.
2Area of stationary object
If a self-resonated circuit is used to generate clock signals, then chip area is reduced, but frequency stability deteriorates due to environmental variations
Solution Approach 1:
The patent applies dynamics by making the biasing current adjustable through a control circuit that dynamically modifies the current based on environmental conditions. The biasing circuit includes transistors and resistors configured to allow dynamic adjustment of the biasing current, enabling the oscillator to adapt to temperature and voltage variations while maintaining frequency stability and small chip area.
Solution Approach 2:
The patent changes physical parameters by adjusting the biasing current to compensate for environmental variations. The control circuit monitors environmental conditions and modifies the biasing current parameter accordingly, allowing the oscillator to maintain stable frequency operation across different temperatures and supply voltages without increasing chip area.
3Measurement precision
If fixed resistance is used for biasing current generation, then frequency derivation is reduced, but adaptability to environmental changes deteriorates
Solution Approach 1:
The patent applies dynamics by replacing fixed resistance with a dynamic biasing circuit that can adjust the biasing current in response to environmental changes. The control circuit modifies the biasing current parameter to maintain accurate frequency operation while adapting to temperature and voltage variations, achieving both frequency accuracy and environmental adaptability.
Solution Approach 2:
The patent implements feedback by using a control circuit that monitors environmental conditions and adjusts the biasing current accordingly. The feedback mechanism allows the oscillator to automatically compensate for environmental variations, maintaining frequency accuracy while adapting to changing operating conditions.
Data Source
AI summary
The present invention relates to an oscillating apparatus. The oscillating apparatus includes a biasing circuit, a multi-vibrator, a detecting circuit, and a selecting circuit. The biasing circuit is for generating a bias signal, wherein the biasing circuit includes a connecting port for using an impedance device to control an oscillating frequency or for directly connecting to external clock source as a reference clock. The multi-vibrator coupled to the biasing circuit for generating the oscillating frequency according to the quantity of the biasing signal. The detecting circuit coupled to the connecting port for generating a detecting signal whether the connecting port is coupled to the impedance device or the external clock source. The selecting circuit includes an AND gate coupled to the multi-vibrator and the selection signal and an OR gate coupled to the AND gate and the connecting port.