Data Output Circuit With Clock Skew and Mismatch Compensation
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Solution Overview
Problem
Semiconductor apparatuses face challenges in synchronizing data output with clock signals due to skew and mismatch issues, leading to inefficiencies in data transmission.
Innovation Solution
A data output circuit is designed with a clock skew compensation repeater and mismatch compensation driver to synchronize internal data with data synchronization clocks, adjusting capacitance and driving abilities to compensate for clock skews and mismatches, ensuring accurate and synchronized data output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If clock signals are transmitted through transmission lines to synchronize data output, then data synchronization is achieved, but clock skew occurs due to different transmission times for rising and falling edges
Solution Approach 1:
The patent applies preliminary action by pre-compensating for clock skew through capacitance adjustment before data transmission occurs. The capacitance of the transmission line is adjusted in advance based on predicted skew conditions, allowing the rising and falling edges of the clock signal to be balanced before they are used for data synchronization, thereby eliminating timing differences proactively
Solution Approach 2:
The patent changes the electrical parameters of the transmission line by adjusting its capacitance value. This parameter change allows dynamic optimization of signal transmission characteristics, balancing the propagation delays of rising and falling clock edges to minimize clock skew while maintaining data synchronization reliability
2Device complexity
If standard data output circuits are used without compensation, then circuit simplicity is maintained, but transmission errors occur due to clock skew and mismatch
Solution Approach 1:
The patent modifies the electrical parameters of existing circuit components, specifically adjusting the capacitance of the transmission line and the driving abilities of output drivers. This approach improves transmission accuracy by compensating for skew and mismatch effects without requiring a complete redesign of the data output circuit, thus maintaining relative circuit simplicity while enhancing reliability
Solution Approach 2:
The patent introduces dynamic adjustment capabilities to the circuit by enabling variable capacitance and variable driving ability control. This allows the circuit to adapt to different transmission conditions and compensate for skew and mismatch dynamically, improving transmission accuracy while maintaining a relatively simple circuit architecture through programmable or selectable parameters
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
The solution effectively compensates for clock skews and data mismatches, optimizing data output by minimizing transmission errors and ensuring reliable data synchronization, even in the presence of skew and mismatch conditions.
Implementation Method 1
a first clock skew compensation repeater having a first transmission line for receiving and transmitting a rising clock to a first driver and configured to increase or decrease capacitance of the first transmission line in response to rising skew compensation codes
Implementation Method 2
a mismatch compensation driver configured to synchronize internal data with the data synchronization clock and output the internal data synchronized with the data synchronization clock by controlling a rising edge or a falling edge of the internal data according to mismatch compensation codes
Data Source
AI summary
A data output circuit of a semiconductor apparatus includes a clock skew compensation repeater configured to control a delay amount of a clock in response to skew compensation codes and output a data synchronization clock; a mismatch compensation driver configured to synchronize internal data with the data synchronization clock and output the internal data synchronized with the data synchronization clock by controlling a transition timing of the internal data according to mismatch compensation codes; and a data output driver configured to generate output data in response to an output of the mismatch compensation driver.