Bandgap Reference Circuit With Dynamic Switching for Temperature Stability
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Solution Overview
Problem
The semiconductor industry faces challenges in achieving accurate and stable voltage references for low-voltage semiconductor devices, particularly in reducing voltage ratings while maintaining operation under varying conditions, as existing bandgap voltage references are sensitive to temperature and have limitations in integration density.
Innovation Solution
A bandgap reference apparatus and method utilizing a current mirror configuration with control switches, capacitors, and groups of switches to generate a temperature-stable voltage reference, employing a convergence control method to eliminate offsets and achieve equilibrium operating points in dipoles, thereby reducing temperature sensitivity and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional bandgap voltage references are used, then voltage reference functionality is provided, but temperature sensitivity and limited integration density are achieved
Solution Approach 1:
The patent implements a dynamic switching mechanism that periodically exchanges the roles of transistors MP1, MP2, and MP3 in the current mirror configuration. This dynamic reconfiguration allows the system to eliminate offset errors through iterative averaging, thereby reducing temperature sensitivity while maintaining voltage reference stability.
Solution Approach 2:
The patent changes the operational parameters of the bandgap reference by implementing periodic switching of transistor connections and using capacitors to store and transfer voltage states. This parameter changing approach enables offset elimination and temperature compensation, improving voltage reference stability without increasing temperature sensitivity.
2Productivity
If minimum feature size is reduced to increase integration density, then more components can be integrated, but voltage rating accuracy and operational stability are compromised
Solution Approach 1:
The dynamic switching mechanism periodically reconfigures the current mirror connections, allowing the system to average out process variations and manufacturing tolerances that become more significant at smaller feature sizes. This dynamic approach maintains voltage reference accuracy despite reduced minimum feature size and increased integration density.
Solution Approach 2:
The patent employs a feedback mechanism where the periodic switching and capacitor-based state storage create an iterative process that converges to an equilibrium operating point. This feedback loop compensates for manufacturing variations, maintaining measurement precision even as integration density increases through feature size reduction.
3Ease of operation
If conventional bandgap reference circuits are used, then voltage reference functionality is achieved, but offset errors and limited convergence to equilibrium are present
Solution Approach 1:
The patent implements dynamic switching that periodically exchanges transistor roles in the current mirror, creating a convergent iterative process. This dynamic operation allows the circuit to naturally eliminate offset errors and reach an equilibrium operating point, improving measurement precision while maintaining ease of operation through automatic convergence.
Solution Approach 2:
The periodic switching of transistor connections and capacitor charging/discharging cycles create a rhythmic operation that systematically eliminates offset errors. This periodic action drives the circuit toward its equilibrium point, enhancing voltage reference accuracy without complicating the overall operation.
Data Source
AI summary
An apparatus includes a current mirror coupled to an output of an amplifier through control switches, a plurality of capacitors, each of which is coupled to a common node of a leg of the current mirror and a corresponding control switch, a first dipole coupled to a first input of an amplifier, a second dipole coupled to a second input of the amplifier, a third dipole coupled to an output of the apparatus configured to generate the bandgap reference voltage, and groups of switches coupled between the current mirror and the dipoles.