Single-Ended Receiver Reference Circuit for Resonant Noise Mitigation
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Solution Overview
Problem
High-speed single-ended data transmission systems face challenges in maintaining link performance due to resonant noise caused by sudden changes in power delivery networks, leading to errors in data transmission.
Innovation Solution
A reference voltage generation circuit that mixes noise from both power supply voltages to create a shared reference voltage, enhancing data reception by reducing noise-induced errors and allowing for larger data eyes, thereby improving data transmission fidelity and enabling higher data rates through multi-level transmission systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If single-ended signaling is used to achieve high density, then system density is improved, but noise susceptibility increases
Solution Approach 1:
The patent converts the harmful resonant noise from power delivery networks into a beneficial signal by capturing it through the reference voltage terminal and mixing it with the inverted data signal. This allows the receiver to subtract the noise component from the received signal, transforming the harmful noise into useful information for noise cancellation.
2Speed
If power delivery networks respond to sudden power demands, then active state transition is enabled, but resonant noise is generated
Solution Approach 1:
The patent performs preliminary action by capturing the resonant noise signal through the reference voltage terminal before it fully corrupts the data signal. The noise capture circuit is continuously monitoring the reference voltage, so when the resonant noise occurs during state transitions, it has already been captured and can be immediately subtracted from the received data signal.
3Measurement precision
If noise capture circuit is added to mitigate resonant noise, then data reception accuracy is improved, but circuit complexity increases
Solution Approach 1:
The patent achieves multi-functionality by using the reference voltage terminal for dual purposes: it serves as the traditional reference voltage input for the receiver while simultaneously acting as a noise capture path. The same terminal and associated circuitry that provide reference voltage also capture the resonant noise, eliminating the need for separate dedicated noise capture hardware.
4Productivity
If data transmission rate is increased, then productivity is improved, but noise-induced errors increase
Solution Approach 1:
The patent implements feedback by using the captured reference voltage noise signal to adjust and correct the received data signal. The noise capture circuit continuously monitors the reference voltage and feeds this noise information back to the subtraction circuit, which then compensates for the noise in real-time, maintaining signal integrity even at high transmission rates.
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 significantly enlarges the data eye, making data reception more robust and enabling higher data transmission rates by allowing multi-level data transmission, such as PAM4, which doubles bandwidth for a given clock speed, and improves data transmission fidelity by reducing noise effects.
Implementation Method 1
The reference voltage generation circuit is operable to form the shared reference voltage by mixing noise from the power supply voltage and noise from the second terminal
Data Source
AI summary
An integrated circuit includes a first terminal for receiving a data signal, a second terminal for receiving an external reference voltage, a receiver, and a reference voltage generation circuit. The receiver is powered by a power supply voltage with respect to ground and has a first input coupled to the first terminal, a second input for receiving a shared reference voltage, and an output for providing a data input signal. The reference voltage generation circuit is coupled to the second terminal and receives the power supply voltage. The reference voltage generation circuit is operable to form the shared reference voltage by mixing noise from the power supply voltage and noise from the second terminal.