Voltage Generation Circuit with Feedback Charge Control
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Solution Overview
Problem
As semiconductor devices become more highly integrated, they face challenges in maintaining stable operations with low power supply voltages, where small fluctuations in power supply voltage can lead to unstable voltage generation, necessitating the design of circuits that can generate stable voltages to ensure high performance.
Innovation Solution
A voltage generation circuit comprising a current source, a comparison circuit, and a charge supply circuit that controls the charge supplied to nodes based on a voltage difference, generating a drive voltage and a supply voltage with a constant level by adjusting the charge amount from a power supply voltage terminal, using PMOS and NMOS transistors to maintain output impedance and compensate for voltage fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If power supply voltage is lowered to operate sub-micron circuits at high speed, then productivity and speed are improved, but voltage stability deteriorates due to small fluctuations causing large voltage variations
Solution Approach 1:
The patent implements a feedback mechanism where the voltage generation circuit continuously monitors the voltage difference between its output and a reference voltage, and adjusts the charge supply accordingly. The comparison circuit compares the output voltage with reference voltage, and the control circuit modifies the charge amount based on the detected difference, creating a closed-loop system that maintains voltage stability despite fluctuations in power supply voltage.
Solution Approach 2:
The voltage generation circuit performs self-regulation by automatically adjusting its own charge supply based on the detected voltage difference. The circuit monitors its own output voltage and modifies its charging behavior without external intervention, enabling it to maintain stable operation under varying power supply conditions through autonomous feedback control.
2Reliability
If charge supply amount is increased to maintain voltage level, then voltage stability is improved, but energy consumption increases
Solution Approach 1:
The patent employs dynamic charge supply control where the charging rate is continuously adjusted based on the detected voltage difference. When the output voltage drops below the reference, the circuit increases charge supply; when it exceeds the reference, the circuit reduces charge supply. This dynamic adjustment enables the system to maintain voltage stability while minimizing unnecessary energy consumption compared to constant high-rate charging.
Data Source
AI summary
A voltage generation circuit includes a current source connected to a first node to generate a first internal current corresponding to a constant current, a comparison circuit generating a drive voltage whose level is controlled according to a voltage difference between the first node whose voltage level is controlled by the first internal current and a second node, and a charge supply circuit controlling an amount of charge supplied to the first and second nodes from a power supply voltage terminal according to a level of the drive voltage to generate a supply voltage.