Oscillation Circuit Frequency Spreading via Bias Voltage Control
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Solution Overview
Problem
The existing oscillation circuits face challenges in performing a frequency spreading function effectively due to multiple parameters influencing the oscillation frequency, leading to potential deviations and increased complexity and cost from the number of components required.
Innovation Solution
An oscillation circuit design that includes a ramp voltage generating unit and a clock signal generating unit, utilizing a bias unit to apply either a ramp voltage or a fixed voltage as a bias voltage to a resistor, with an oscillator determining the oscillation frequency based on the bias current, allowing for simple frequency spreading without an external resistor, thereby reducing noise intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple parameters (Vx, Vy, Rx, Ry) are used in the oscillation circuit to enable frequency spreading, then the frequency spreading function is achieved, but the oscillation frequency deviates due to parameter variations and the device complexity increases
Solution Approach 1:
The patent extracts the frequency spreading function from a complex multi-parameter system and implements it using a single external capacitor. By removing resistors Rx and Ry and using only capacitor Cy connected to terminal Ty, the circuit achieves frequency spreading through the capacitor's voltage characteristics without requiring multiple resistive elements, thereby reducing device complexity while maintaining the adaptability for frequency spreading
Solution Approach 2:
The single capacitor Cy serves multiple functions: it generates the ramp voltage for frequency spreading, determines the oscillation frequency, and replaces the need for separate resistors Rx and Ry. This multi-functional component approach reduces the total number of components while maintaining the frequency spreading capability
2Adaptability or versatility
If resistors Rx and Ry are connected to achieve frequency spreading, then the oscillation frequency can be varied, but the set size and cost increase
Solution Approach 1:
The patent merges the functions of multiple resistors (Rx and Ry) into a single capacitor Cy. The capacitor simultaneously provides the frequency spreading function and determines the oscillation frequency, eliminating the need for separate resistive components and reducing the quantity of external components required
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
The solution enables a simple and effective frequency spreading function, reducing noise intensity and minimizing the number of external components, resulting in a more compact and cost-effective oscillation circuit.
Implementation Method 1
generates a triangular ramp voltage Vy (for example, 1V≦Vy≦2V) by charging/discharging the capacitor Cy externally attached to the external terminal Ty
Implementation Method 2
a hysteresis comparator configured to generate a comparison signal by comparing a voltage across the capacitor with a threshold voltage
Implementation Method 3
an oscillator configured to determine an oscillation frequency of the clock signal in response to a bias current flowing through the resistor
Data Source
AI summary
An oscillation circuit includes: a ramp voltage generating unit configured to generate a ramp voltage; and a clock signal generating unit configured to generate a clock signal. The clock signal generating unit includes: a bias unit configured to apply one of the ramp voltage and a fixed voltage, as a bias voltage, to a resistor; and an oscillator configured to determine an oscillation frequency of the clock signal in response to a bias current flowing through the resistor.