Interface Circuit Equalization Signal Generation for Die-to-Die Communication
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Solution Overview
Problem
High-speed interface circuits used for die-to-die communication are susceptible to reflected waves, which degrade signal quality at the receiver due to the short internal channels, necessitating a technique to suppress these reflected waves.
Innovation Solution
The implementation of an interface circuit with an equalization signal generation circuit that delays or adjusts the width of the input data signal to generate an equalization signal, which is combined with the original signal and transmitted to suppress reflected waves on the internal channel, thereby improving signal quality at the receiver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high-speed interface circuits use short internal channels for die-to-die communication, then signal transmission speed is improved, but reflected waves are generated that degrade signal quality
Solution Approach 1:
The equalization signal generation circuit performs preliminary action by generating an equalization signal in advance based on the input data signal. This equalization signal is combined with the original signal before transmission to pre-compensate for the reflected wave effects that will occur during transmission through the short internal channel, thereby maintaining signal quality while preserving high-speed transmission
2Loss of time
If short internal channels are used in die-to-die communication, then transmission time is reduced, but reflected waves impair signal quality at the receiver
Solution Approach 1:
The equalization signal acts as an intermediary element that mediates between the transmitted data signal and the reflected wave interference. By combining the equalization signal with the original signal before transmission, the system introduces a compensating signal that counteracts the reflected wave effects, thereby preserving signal quality without increasing transmission time
Data Source
AI summary
An interface circuit includes; a transmitter interface circuit including an output pad and configured to receive a first input data signal and generate a second input data signal from the first input data signal, and a receiver interface circuit including an input pad and configured to receive the second input data signal via the output pad and an internal channel. The transmitter interface circuit also includes an equalization signal generation circuit configured to receive the first input data signal, generate a pulse signal by delaying the first input data signal by applying a target delay time or a target width adjustment to the first input data signal, generate an equalization signal based on the pulse signal, and provide the equalization signal to the output pad to suppress a reflected wave on the internal channel.