Dynamic Slew Rate Circuit for Low-Voltage USB Repeaters
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Solution Overview
Problem
USB2.0 technology faces challenges in power efficiency and reliability due to increased device density and manufacturing costs associated with 3.3V IO signaling, necessitating a low voltage solution for optimized inter-chip interconnects.
Innovation Solution
A slew rate control circuit with an adjustable impedance control circuit and one shot pulse generation is employed in USB repeaters to manage the rise and fall times of input signals, allowing for trimming of impedance to maintain compliance with USB standards while reducing power consumption and silicon area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If 3.3V IO signaling is used for USB2.0 technology, then device compatibility and ecosystem support are maintained, but manufacturing cost increases exponentially and power consumption increases
Solution Approach 1:
The patent changes the voltage parameter from 3.3V to lower voltage levels (1.8V or 1.2V) to reduce manufacturing cost and power consumption. This is achieved through voltage translation circuits that convert between different voltage domains, allowing USB2.0 compatibility at lower voltage levels that are more cost-effective for advanced process technologies.
Solution Approach 2:
The patent introduces voltage translation circuits as intermediary components between the low-voltage USB2.0 interface and the 3.3V USB bus. These translator circuits mediate the voltage level differences, enabling compatibility with existing USB2.0 ecosystem while operating at lower, more efficient voltage levels.
2Area of stationary object
If device density is increased to pack more devices onto a single integrated chip, then area efficiency is improved, but device reliability deteriorates due to densely packed transistors
Solution Approach 1:
The patent segments the USB interface into separate voltage domains (low-voltage USB2.0 domain and 3.3V USB domain) with dedicated translation circuits. This segmentation isolates the densely packed low-voltage transistors from the high-voltage signaling path, allowing high device density in the low-voltage domain while maintaining reliability in the high-voltage domain through proper voltage domain separation.
3Manufacturing precision
If impedance control is implemented during signal transitions, then signal integrity and USB standard compliance are improved, but circuit complexity increases
Solution Approach 1:
The patent implements dynamic impedance control where the impedance of the translation circuit is adjusted based on the signal transition state. During voltage level transitions, the impedance is optimized to minimize signal reflections and ensure clean transitions. This dynamic adjustment maintains signal integrity while avoiding the need for complex static impedance matching networks.
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 optimizes power efficiency and reliability by dynamically controlling impedance to meet USB standards, reducing silicon area and power consumption, and enhancing the performance of USB repeaters for high-speed communication.
Implementation Method 1
The impedance control circuit has an adjustable impedance that is configured to be adjusted during a rise and a fall of the input signal
Implementation Method 2
The one shot generation circuit to generate the one shot pulse at a rising edge of the input signal
Data Source
AI summary
A slew rate control circuit is disclosed. The slew rate control circuit includes an input port to receive an input signal, a transmitter to transmit the input signal to an output port and an impedance control circuit coupled between the transmitter and the output port. The impedance control circuit has an adjustable impedance that is configured to be adjusted during a rise and a fall of the input signal using a trim code and an one shot pulse.