Relaxation Oscillation Circuit With RS-Latch Current Switching
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Solution Overview
Problem
Conventional oscillation circuits have high power consumption, which is a limitation that needs to be addressed.
Innovation Solution
The oscillation circuit design includes a first and second current source circuit, capacitors, comparator circuits, and an RS latch, with switches controlled by the RS latch to manage current paths, optimizing power usage by selectively connecting or disconnecting current paths based on signal levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional relaxation oscillation circuit is used, then oscillation functionality is achieved, but power consumption is high
Solution Approach 1:
The patent implements periodic action by using two switches (first switch and second switch) that alternately connect and disconnect current paths to capacitors C1 and C2 based on the output signal level of the RS latch. This periodic switching enables the capacitors to be charged and discharged in cycles, generating oscillation while reducing power consumption by ensuring current flows through the load only during specific phases of the oscillation cycle rather than continuously
2Stability of the object's composition
If continuous current path is maintained, then oscillation stability is improved, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the current path configuration changeable through the RS latch and two switches. The circuit transitions between different states: when the RS latch output is High, the first switch connects C1 to the current source while the second switch disconnects C2; when the output is Low, the connections are reversed. This dynamic switching maintains oscillation stability through controlled state transitions while reducing power consumption by limiting continuous current flow
Data Source
AI summary
Provided is an oscillation circuit including: a first current source circuit; a second current source circuit; a resistor between the output terminal of the first current source circuit and a second power source; a first capacitor; a second capacitor; a first comparator circuit having a first input terminal to which is a voltage across the resistor is applied as a reference voltage and a second input terminal to which a voltage of the first capacitor is applied; a second comparator circuit having a first input terminal to which is the reference voltage is applied and a second input terminal to which a voltage of the second capacitor is applied; an RS latch; a first and a second switches switching a destination, of an current supplied from the second current source circuit, selected from the first and the second capacitors.