Reference Voltage Generation Circuit for Oscillation Frequency Control
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Solution Overview
Problem
Existing reference voltage generation circuits and oscillation circuits face challenges in efficiently managing temperature-dependent oscillation frequencies and power consumption, particularly in high-temperature environments, where they struggle to maintain constant voltage and frequency characteristics.
Innovation Solution
A reference voltage generation circuit incorporating a band gap reference circuit with adjustable resistance ratios and differential amplifiers to generate a reference voltage with a desired temperature characteristic, which is used to control the oscillation frequency of an RC oscillation circuit, allowing for arbitrary temperature-dependent frequency settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the frequency of the oscillation circuit is raised to achieve fast processing at high temperature, then processing speed is improved, but power consumption increases
Solution Approach 1:
The oscillation frequency is made dynamically adjustable based on temperature conditions. The circuit can switch between different frequency modes (first and second oscillation frequencies) depending on whether the temperature is below or above a reference temperature, allowing optimization of both speed and power consumption for different operating conditions
Solution Approach 2:
The invention changes the oscillation frequency parameter according to temperature variations. By detecting temperature and adjusting the frequency parameter accordingly, the system achieves fast processing at high temperatures when needed while being able to reduce frequency and power consumption when high speed is not required
2Use of energy by moving object
If the frequency of the oscillation circuit is decreased to suppress power consumption at high temperature, then power consumption is reduced, but processing speed decreases
Solution Approach 1:
The system dynamically adjusts oscillation frequency based on temperature and processing requirements. When power consumption needs to be suppressed, the circuit operates at a lower second oscillation frequency, but can switch to a higher first oscillation frequency when fast processing is required, providing flexible optimization of the power-speed tradeoff
Solution Approach 2:
The oscillation frequency parameter is changed based on temperature conditions and power management requirements. The circuit can operate at different frequency levels to balance power consumption and processing speed according to system needs
3Stability of the object's composition
If a conventional band gap reference circuit is used to generate constant reference voltage, then voltage stability is improved, but temperature-dependent frequency control capability is lost
Solution Approach 1:
The reference voltage generation is segmented into multiple paths: one path generates a constant reference voltage for stable operation, while another path generates a temperature-dependent reference voltage for frequency control. This segmentation allows both voltage stability and temperature-dependent frequency control to coexist
Solution Approach 2:
A temperature detection circuit acts as an intermediary between the temperature environment and the oscillation circuit. It detects temperature and generates appropriate control signals to adjust the oscillation frequency, enabling temperature-dependent frequency control without compromising the stability provided by the constant reference voltage
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 precise control over oscillation frequency characteristics relative to temperature, reducing power consumption and improving frequency stability across varying temperatures, thereby addressing the limitations of existing technologies.
Implementation Method 1
a first PN junction element having a first forward direction voltage; a second PN junction element having a different current density from the first PN junction element and having a second forward direction voltage higher than the first forward direction voltage
Implementation Method 2
a first differential amplifier having a first input configured to be connected to an anode of the first PN junction element and a second input configured to be connected to a first connection node between a first and a second resistor disposed in series between a first output of the first differential amplifier and a first potential, and configured to generate a first output voltage at the first output
Implementation Method 3
The band gap reference circuit (hereafter BGR circuit) generates a constant voltage against a temperature change by adding a voltage having a positive temperature characteristic to a voltage having a negative temperature characteristic
Data Source
AI summary
A reference voltage generation circuit has: a first PN junction element; a second PN junction element having a higher forward direction voltage than the first PN junction element; a first differential amplifier inputting an anode of the first PN junction element and a first connection node between a first and a second resistor disposed in series between a first output of the first differential amplifier and a first potential, and generating a first output voltage at the first output; and a second differential amplifier inputting an anode of the second PN junction element and a second connection node between a fourth and a third resistor disposed in series between a second output of the second differential amplifier and the first output of the first differential amplifier, and generating a reference voltage at the second output. A resistance ratio between the third and the fourth resistors is variable.