Semiconductor Clock Phase Alignment for Memory Data Timing
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Solution Overview
Problem
Conventional semiconductor devices face challenges in aligning multiple clock signals, such as differential command clock and forwarded differential write clock, which are essential for improving system performance in next-generation memories like GDDR5, due to inadequate synchronization and alignment techniques.
Innovation Solution
A semiconductor device with a selection circuit and phase detector is used to generate a timing signal based on the phase difference between input clock signals, allowing for the alignment of clock phases through a phase aligner, thereby enhancing synchronization and reducing data output timing errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple different clock signals (CK and WCK) are used to improve system performance, then productivity is improved, but synchronization and alignment between clocks becomes more difficult
Solution Approach 1:
The patent implements a feedback mechanism where the phase detector continuously monitors the phase difference between CK and WCK signals and generates control signals to adjust the timing of WCK through the delay circuit, ensuring continuous synchronization without manual intervention
Solution Approach 2:
The patent introduces intermediate components including a phase detector to measure phase differences, a delay circuit to adjust WCK timing, and a selection circuit to choose between different clock sources, thereby mediating the synchronization between multiple clock signals
2Reliability
If phase alignment between clock signals is improved, then reliability is improved, but device complexity increases due to additional synchronization circuits
Solution Approach 1:
The patent combines multiple functions into integrated circuits: the phase detector is integrated with the PLL, the delay circuit is combined with the clock distribution network, and the selection circuit merges clock source selection with the existing clocking architecture, reducing overall system complexity while maintaining alignment accuracy
3Device complexity
If conventional single clock signal operation is used, then device complexity is reduced, but productivity and system performance are limited
Solution Approach 1:
The patent implements a dynamic clocking structure where the system can adaptively switch between single-clock and multi-clock modes based on operational requirements, allowing the clocking architecture to be flexible rather than fixed, thereby optimizing performance for different operating conditions
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 aligns multiple clock signals, improving system performance by reducing jitter and data output timing errors, thus optimizing the operational characteristics of semiconductor devices.
Implementation Method 1
a phase detector to detect a phase difference between a second clock signal output from the controller and the timing signal output from the selection circuit
Data Source
AI summary
A semiconductor device includes a selection circuit and a phase detector. The selection circuit, in response to a first selection signal output from a controller, outputs as a timing signal a first clock signal output from the controller or an output signal of a PLL using the first clock signal as a first input. The phase detector generates a voltage signal indicating a phase difference between a second clock signal output from the controller and the timing signal output from the selection circuit. The semiconductor device further includes a data port, a memory core storing data, and a serializer, in response to the timing signal output from the selection circuit, serializing data output from the memory core and outputting serialized data to the controller via the data port. The controller generates the first selection signal based on at least one of the voltage signal and the serialized data.