Bias Current Generator Circuit for Low Supply Voltage Sensitivity
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Solution Overview
Problem
Conventional memory sub-systems face challenges in reducing supply voltage sensitivity of bias current generator circuitry, leading to variations in output current that can cause overheating or insufficient power supply, necessitating additional space for voltage regulators or compensation circuits, which reduces space for other functions.
Innovation Solution
Generating a second bias current to apply to the primary bias current, reducing supply voltage sensitivity and minimizing space occupancy within the memory sub-system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage regulators or compensation circuits are added to reduce supply voltage sensitivity, then output current stability is improved, but device area increases
Solution Approach 1:
The patent combines the bias current generation and supply voltage compensation functions into a single integrated circuit block. The compensation circuit is merged with the bias current generator, allowing both functions to be performed within the same circuit area without requiring separate voltage regulator components.
Solution Approach 2:
The bias current generator circuit is designed to perform multiple functions: generating the bias current and simultaneously compensating for supply voltage variations. This multi-functional design eliminates the need for separate compensation circuits or voltage regulators, thereby reducing the overall device area.
2Reliability
If bias current generator circuitry is designed to reduce supply voltage sensitivity, then power supply stability is improved, but circuit complexity increases
Solution Approach 1:
The bias current generator circuit automatically compensates for supply voltage variations using internal feedback mechanisms. The circuit monitors its own operation and self-adjusts to maintain stable output current, eliminating the need for external control circuits or complex compensation mechanisms.
Solution Approach 2:
The patent implements feedback mechanisms within the bias current generator that detect supply voltage variations and automatically adjust the bias current to compensate. This internal feedback loop provides stable power supply output without requiring complex external control systems.
Data Source
AI summary
A supply voltage sensitivity of an output current of a bias current generator circuit is reduced. The bias current generator includes a plurality of transistors and a plurality of resistors coupled to the plurality of transistors. The supply voltage sensitivity of the output current of the bias current generator circuit is reduced by applying a second bias current generated by the bias current generator circuit to a first bias current generated by the bias current generator circuit.