Substrate Bias Generation Circuit for Stable Solar Clock Startup
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Solution Overview
Problem
Existing electronic system devices with solar cell clocks face challenges in completing the startup operation stably due to high power consumption, which cannot be compensated by charge stored in capacitors, leading to instability in quick start-ups.
Innovation Solution
The electronic system device incorporates a power generation device, a substrate bias generation circuit, memory circuits with field effect transistors, and a power supply monitor circuit to accumulate and manage substrate bias voltages, allowing for efficient storage and supply of back bias voltages to transistors, thereby stabilizing the startup process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If charge stored in capacitor is used for quick start, then startup speed is improved, but power consumption cannot be compensated leading to unstable startup operation
Solution Approach 1:
The substrate bias generation circuit performs preliminary charge accumulation in capacitors during the normal operation phase, storing substrate bias charges before startup is needed. This preliminary action ensures that when startup occurs, the accumulated charges can immediately compensate for power consumption and stabilize the startup operation, resolving the contradiction between fast startup and stable operation.
2Reliability
If power consumption of clock circuit is increased for stable operation, then operation reliability is improved, but power consumption exceeds what capacitor charge can compensate
Solution Approach 1:
The substrate bias generation circuit acts as an intermediary energy management system that generates and stores substrate bias voltages in separate capacitors. This intermediary mechanism allows the system to decouple the power consumption requirements from the main power supply, using stored substrate bias charges to compensate for power consumption during startup, thus maintaining operation stability without requiring excessive power consumption.
3Reliability
If substrate bias voltage is continuously supplied, then transistor performance is maintained, but power consumption increases during low-consumption modes
Solution Approach 1:
The substrate bias generation circuit operates periodically rather than continuously. During normal operation, it accumulates charges in capacitors; during low-consumption modes, it maintains transistor performance by utilizing the previously accumulated charges. This periodic action pattern allows the system to maintain reliable transistor performance while reducing power consumption during low-consumption modes, as the capacitors discharge their stored substrate bias voltages without requiring continuous power supply.
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 configuration enables the electronic system device to complete the startup operation stably by efficiently managing power supply and substrate bias voltages, reducing power consumption and ensuring reliable operation in low-consumption modes.
Implementation Method 1
a first capacitor connected to the first control switch via a second power supply node and receiving the substrate bias voltage from the substrate bias generation circuit
Implementation Method 2
Energy harvest (environmental power generation) technology is known in which power is obtained from energy such as sunlight, vibration and heat
Data Source
AI summary
An electronic system device comprises a power generation device generating a power supply voltage, a substrate bias generation circuit connected to the power generation device, a memory circuit, a monitor circuit, and a capacitor connected to the substrate bias generation circuit via a switch. The substrate bias generation circuit generates a substrate bias voltage from the power supply voltage and supplies charges based on the substrate bias voltage to the capacitor while the switch is ON-state. While the switch is OFF-state, the capacitor stores the accumulated charges based on the substrate bias voltage. While the switch is ON-state, the substrate bias generation circuit adds based on the substrate bias voltage to charge that was held, and states the back bias voltage. The substrate bias generation circuit supplies the back bias voltage to memory circuit.