RC Oscillator Circuit With Negative Amplifier Capacitance Boost
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Solution Overview
Problem
Existing oscillators face challenges in achieving low operation frequencies with large RC values, leading to increased size and costs, while advanced capacitor manufacturing technologies require complex processes and higher costs.
Innovation Solution
A resistor-capacitor oscillator design with a capacitor having an enlarged effective capacitance, utilizing a negative amplifier configuration to increase capacitance without increasing power consumption or requiring specialized fabrication processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a large RC value is used to achieve low operation frequency, then the oscillation frequency is reduced, but the capacitor size and manufacturing cost increase
Solution Approach 1:
The patent changes the electrical parameters of the circuit by introducing a negative amplifier configuration that modifies the effective capacitance value. The negative amplifier creates a negative impedance that, when combined with the positive impedance of the capacitor, results in an enlarged effective capacitance without physically enlarging the capacitor. This parameter transformation allows achieving low oscillation frequencies while maintaining compact capacitor dimensions.
Solution Approach 2:
The negative amplifier acts as an intermediary element between the capacitor and the rest of the oscillator circuit. It mediates the capacitance value by providing a negative impedance that effectively increases the total capacitance seen by the oscillator. This intermediary device enables the system to achieve large RC time constants without requiring large physical capacitors, thus resolving the contradiction between low frequency operation and compact size.
2Quantity of substance
If advanced capacitor manufacturing technology is used to achieve high-density capacitors, then capacitor density is improved, but manufacturing complexity and cost increase
Solution Approach 1:
Instead of using complex manufacturing processes to create high-density capacitors, the patent creates a functional copy or equivalent of large capacitance through the negative amplifier circuit. The negative impedance amplifier generates an electrical effect that mimics the behavior of a large physical capacitor, but achieves it through standard circuit components and conventional manufacturing processes. This functional copying approach avoids the need for specialized high-density capacitor fabrication while achieving the same electrical performance.
3Ease of manufacture
If standard capacitor size is used in low frequency oscillators, then manufacturing cost is reduced, but the oscillator cannot achieve low operation frequencies
Solution Approach 1:
The patent transforms the effective capacitance parameter through the negative amplifier configuration. By introducing a negative impedance element, the system changes the effective RC time constant without changing the physical capacitor value. This allows standard, low-cost capacitors to be used while achieving the electrical characteristics necessary for low-frequency oscillation, thus maintaining ease of manufacture and low cost while achieving the desired low operation frequency.
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 design achieves a significant reduction in capacitor size while maintaining performance, allowing for lower operation frequencies without increasing power consumption or manufacturing complexity.
Implementation Method 1
the first inverter is configured as a negative amplifier, and the first capacitive device and the resistor network are configured to determine a frequency of an oscillator
Data Source
AI summary
An apparatus includes a logic gate, a first inverter, a second inverter, a first resistor connected between the output of the logic gate and the input terminal of the first inverter, a first capacitor connected between the input terminal and the output terminal of the first inverter, a second resistor connected between the output terminal of the first inverter and the input terminal of the second inverter, a second capacitor connected between the input terminal of the second inverter and ground, and a third resistor connected between the output terminal of the second inverter and the logic gate, wherein the second input of the logic gate is configured to receive an enable signal, and wherein the first inverter is configured as a negative amplifier such that an effective capacitance provided by the first inverter and the first capacitor is greater than a physical capacitance of the first capacitor.