Termination Circuit With Separate Input and Output Impedance Control
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Solution Overview
Problem
Conventional termination circuits face challenges in separately controlling impedance values during data input and output, leading to impedance mismatching issues that affect signal transmission quality and reliability in semiconductor devices.
Innovation Solution
The proposed termination circuit includes pull-up and pull-down termination units, along with additional resistors and a control unit that enables separate control of impedance values during data input and output by activating specific resistors in response to setting values, using a termination signal to adjust termination resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional termination circuit uses shared pull-up and pull-down termination units for both data input and output operations, then the device complexity is reduced, but the impedance values cannot be separately controlled during data input and output, leading to impedance mismatching
Solution Approach 1:
The termination circuit is segmented into separate termination units for data input operations and data output operations. Each termination unit can be independently configured with its own pull-up and pull-down resistors, allowing independent impedance control for input and output operations without affecting the other, thus resolving the impedance matching issue while maintaining reasonable device complexity
Solution Approach 2:
The termination circuit implements dynamic control by selectively activating specific termination units based on the operation mode (data input or data output). The control logic dynamically enables the appropriate termination unit, allowing the impedance to be optimized for the current operation type, thereby achieving reliable impedance matching adaptively
2Reliability
If the termination circuit activates both pull-up and pull-down termination units simultaneously for impedance matching, then the impedance matching improves, but the control flexibility for separate impedance adjustment during input and output operations is reduced
Solution Approach 1:
The termination circuit divides the termination functionality into separate input termination unit and output termination unit, each with independent pull-up and pull-down resistors. This segmentation allows the circuit to activate only the necessary termination unit based on operation mode, providing both impedance matching when needed and control flexibility through selective activation
Solution Approach 2:
The circuit changes the operational parameters by selectively enabling different termination units based on the operation mode. During data input, the input termination unit is activated with specific impedance settings, while during data output, the output termination unit is activated with different impedance settings, achieving both impedance matching and control flexibility through parameter changes
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution allows for precise control of impedance values during data input and output, reducing impedance mismatching and enhancing signal transmission quality by enabling optimal impedance settings during both operations.
Implementation Method 1
one or more pull-up resistors connected to the interface node and enabled to affect termination resistance in response to a pull-up setting value when a termination signal is activated; and one or more pull-down resistors connected to the interface node and enabled to affect termination resistance in response to a pull-down setting value when the termination signal is activated
Data Source
AI summary
A termination circuit includes: a pull-up termination unit configured to pull-up terminate an interface node in response to a pull-up signal; a pull-down termination unit configured to pull-down terminate the interface node in response to a pull-down signal; one or more pull-up resistors connected to the interface node and enabled to affect termination resistance in response to a pull-up setting value when a termination signal is activated; and one or more pull-down resistors connected to the interface node and enabled to affect termination resistance in response to a pull-down setting value when the termination signal is activated.