Receiver Buffer Circuit With Duty-Skew Compensation Across Voltage Domains
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Solution Overview
Problem
Semiconductor receiver circuits face challenges in maintaining stable output characteristics due to variations in heterogeneous power supply voltages, which affect data reception and processing.
Innovation Solution
The implementation of a buffer circuit configuration that includes first and second logic gates coupled to internal and external voltage terminals, enabling data inversion and compensation for duty skew based on enable signals and reference voltages, ensuring stable output regardless of power supply voltage fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a receiver circuit operates with heterogeneous power supply voltages (external and internal), then the circuit can be designed with flexibility in voltage sources, but the output characteristics become unstable due to voltage variations
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the compensation amount based on the external voltage level. When the external voltage changes, the compensation circuit modifies its compensation amount to counteract the duty skew, thereby maintaining stable output characteristics despite voltage variations. This is achieved by changing the operational parameters of the compensation circuit in response to voltage fluctuations.
2Stability of the object's composition
If a buffer circuit is designed to compensate for duty skew, then output stability is improved, but the circuit complexity increases due to additional logic gates and control mechanisms
Solution Approach 1:
The buffer circuit is segmented into distinct functional modules: a first logic gate for data inversion, a second logic gate for output inversion, and a compensation circuit for duty skew correction. This segmentation allows each module to perform a specific function, making the overall complex circuit more manageable and easier to design while achieving stable output characteristics through coordinated operation of the segments.
Solution Approach 2:
The compensation circuit acts as an intermediary between the logic gates and the output, mediating the duty skew caused by voltage variations. By introducing this intermediate compensation stage, the circuit maintains stable output characteristics without requiring complete redesign of the entire buffer structure, thus balancing complexity and performance.
3Reliability
If the buffer circuit compensates for duty skew based on external voltage level, then output stability under voltage variation is improved, but the control mechanism becomes more complex
Solution Approach 1:
The compensation circuit employs a feedback mechanism where the external voltage level is monitored and used to determine the appropriate compensation amount. This feedback loop allows the circuit to automatically adjust its compensation in response to voltage variations, improving reliability under varying conditions while keeping the control mechanism relatively simple through automatic adjustment rather than complex external control.
Data Source
AI summary
The present technology may include: a first logic gate coupled to an internal voltage terminal and configured to receive data and invert and output the data according to a first enable signal; and a second logic gate coupled to the internal voltage terminal and configured to invert an output of the first logic gate and to output an inverted output as a first buffer signal according to the first enable signal, and configured to compensate for a duty skew of the first buffer signal according to a level of an external voltage.