Resistance Compensation Circuit Using Transistor Switching
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Solution Overview
Problem
Conventional resistance compensation circuits in integrated circuits face challenges due to area limitations and inaccurate equivalent resistance, preventing them from working with nonvolatile memories of different frequencies.
Innovation Solution
The proposed resistance compensation circuit uses transistors instead of trimming pads to select compensation resistors, allowing for reduced area requirements and improved resistance accuracy, with a register and decoder to control transistor switching for precise resistance compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If trimming pads are used to select compensation resistors, then resistance compensation is achieved, but the area required is large (about 40×40 um2)
Solution Approach 1:
The patent replaces the mechanical trimming pad structure with an electronic switching mechanism using transistors. Instead of physically cutting or selecting resistors through trimming pads, the invention uses transistor switches controlled by digital signals to selectively connect compensation resistors in series, thereby achieving resistance compensation without requiring large trimming pad areas.
Solution Approach 2:
The invention changes the control parameter from physical trimming pad configuration to digital control signals stored in a register. By storing control signals that determine transistor switching states, the system can dynamically adjust the equivalent resistance without requiring physical area for multiple trimming pad configurations.
2Measurement precision
If trimming pads are used for resistance compensation, then resistance variation is compensated, but the equivalent resistance accuracy is insufficient due to area limitations
Solution Approach 1:
The patent segments the compensation circuit into multiple discrete compensation resistors (first compensation resistor, second compensation resistor, etc.) that can be independently selected through transistor switching. This segmentation allows for finer adjustment steps and more precise equivalent resistance compensation compared to traditional trimming pad approaches.
Solution Approach 2:
The invention introduces dynamic control through transistor switching, allowing the equivalent resistance to be adjusted based on measured resistance variations. The control signals stored in the register enable the circuit to adaptively select the appropriate combination of compensation resistors to achieve accurate compensation.
3Reliability
If trimming pads are cut off to compensate resistance, then resistance compensation is achieved, but the resonance frequency cannot be changed again
Solution Approach 1:
The patent implements a universal control mechanism where the register-stored control signals serve multiple functions: they control transistor switching for resistance compensation and can also be used to adjust the resonance frequency of the oscillator. This multi-functional approach allows the same circuit to adapt to different frequency requirements without requiring permanent physical modifications.
Data Source
AI summary
A resistance compensation circuit and a method thereof for tuning frequency, includes several resistors serially connected to one another, several transistors, each of which connects across one of the corresponding resistances, and a register electrically connected to the gates of the transistors. A control signal controls the switching of the transistors either to compensate the process variation of the resistance through the register or to tune the working frequency of the Integrated circuit.