CMOS Phase Interpolator with DLL and SR Latch for SerDes Signal Fidelity
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Solution Overview
Problem
High-speed integrated circuits face challenges in producing clean, symmetric output waveforms due to noisy and distorted input signals, which degrade with increased frequency, affecting the quality of differential signals and eye diagram fidelity.
Innovation Solution
A CMOS-based phase interpolator device is implemented with a delay-lock loop and SR latch, using a single phase interpolator core to reduce power consumption and improve signal quality by interpolating clock signals and synthesizing frequencies and phases, thereby enhancing output waveform regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If operating frequency is increased to achieve higher data rates, then productivity is improved, but signal quality and waveform fidelity deteriorate due to noise and distortion
Solution Approach 1:
A phase interpolator device is introduced as an intermediary component between the noisy input signal source and the output driver. The phase interpolator receives a differential input signal and generates a cleaned, phase-adjusted output signal that drives the output driver, thereby mediating the signal quality degradation that occurs at high frequencies
Solution Approach 2:
The system employs feedback mechanisms where the phase interpolator continuously adjusts the phase of the output clock signal based on the quality of the input signal and the requirements of the output driver. This feedback loop enables real-time compensation for noise and distortion effects
2Manufacturing precision
If multiple phase interpolator cores are used to improve output waveform quality, then manufacturing precision is improved, but power consumption increases
Solution Approach 1:
Multiple phase interpolator cores are merged into a single integrated phase interpolator device that processes both differential signals simultaneously. This consolidation achieves the same waveform quality improvement as multiple separate cores would provide, but with reduced power consumption and area overhead
Solution Approach 2:
The phase interpolator device is designed to perform multiple functions: it cleans differential signals, adjusts phase, and drives output drivers across various frequency ranges. This multi-functionality eliminates the need for separate dedicated circuits for each function, reducing overall power consumption
Data Source
AI summary
The present invention relates generally to integrated circuits. More particularly, the present invention provides a circuit and method for regulating a voltage for a high speed serializer/deserializer (SerDes) device. But it will be recognized that the technique can be used for regulating memory devices (e.g., DDR 4 SDRAM devices, DDR4 register devices, DDR4 controller devices), and other high speed data applications. In various embodiments, phase-interpolator is implemented in conjunction with a delay-lock loop (DLL) and an SR latch, where one or more outputs of the DLL is used by the SR latch. Additionally, such techniques can be used for a variety of applications such as network and/or computer storage systems, computer servers, hand held computing devices, portable computing devices, computer systems, network appliances and/or switches, routers, and gateways, and the like.