Driver Output Resistance Calibration With Segmented Transistor Control
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Solution Overview
Problem
Existing semiconductor circuits face challenges in achieving high resolution and low capacitance loading while maintaining accurate control of electrical features like output resistance, which is crucial for high-speed drivers, as increasing transistors can lead to increased power consumption and capacitance loading.
Innovation Solution
A semiconductor circuit design incorporating a calibration device, adjustment device, and driver that adjusts output resistance by comparing the last two bits of input signals and controlling the driver's pull-up and pull-down portions using signals generated by a finite state machine, reducing the need for a pre-driver stage and optimizing transistor sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of transistors is increased to achieve higher resolution and decreased quantization error, then the resolution is improved, but power consumption and capacitance loading are adversely increased
Solution Approach 1:
The driver is divided into multiple transistor sets (first transistor set, second transistor set, third transistor set) that can be independently controlled. This segmentation allows the circuit to achieve high resolution control of output resistance by selectively activating specific transistor sets based on the required precision, rather than always using all transistors, thereby reducing overall power consumption and capacitance loading while maintaining high resolution when needed.
2Measurement precision
If the number of transistors is increased to achieve higher resolution and decreased quantization error, then the resolution is improved, but capacitance loading is adversely increased
Solution Approach 1:
The driver is divided into multiple transistor sets (first transistor set, second transistor set, third transistor set) that can be independently controlled. This segmentation allows the circuit to achieve high resolution control of output resistance by selectively activating specific transistor sets based on the required precision, rather than always using all transistors, thereby reducing overall power consumption and capacitance loading while maintaining high resolution when needed.
3Measurement precision
If a pre-driver stage is added to control the driver, then the control precision is improved, but the device complexity and capacitance loading are increased
Solution Approach 1:
The circuit dynamically adjusts the output resistance by controlling different transistor sets based on the input signal characteristics. The adjustment device determines which transistor sets to activate and controls their operation dynamically, eliminating the need for a static pre-driver stage while maintaining precise control over the driver's output resistance.
Data Source
AI summary
A semiconductor device and a method for operating the semiconductor device are provided. The semiconductor device includes a calibration device, an adjustment device and a driver. The calibration device is configured to continuously generate a first signal including a first number of bits. The adjustment device is configured to continuously receive the first signal and generate a second signal according to the last two bits of the first signal The second signal includes a second number of bits, and the second number is different from the first number. The driver is electrically coupled to the adjustment device, wherein an output resistance of the driver is controllable in response to the second signal.