Integrated Output Driver for Low-to-High Voltage Serial Conversion
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Solution Overview
Problem
Existing parallel to serial transmission systems require voltage level shifters, which increase chip cost, degrade signal integrity, and introduce timing jitter due to limited bandwidth, leading to higher power consumption and reduced transmission efficiency.
Innovation Solution
A low to high voltage conversion output driver using a current source, low voltage transistor, and high voltage transistor, eliminating the need for a level shifter by directly converting low voltage serial data to high voltage serial data, thereby reducing chip area and power consumption while minimizing timing jitter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a voltage level shifter is used to convert low voltage serial data to high voltage serial data, then voltage conversion is achieved, but chip area increases and power consumption increases
Solution Approach 1:
The patent merges the voltage conversion function with the existing output driver circuit by using a high voltage transistor whose source is coupled to the drain of a low voltage transistor. This integration eliminates the need for a separate level shifter circuit, thereby reducing chip area while maintaining voltage conversion capability from low voltage serial data to high voltage serial data output.
2Reliability
If a voltage level shifter is used to convert low voltage serial data to high voltage serial data, then voltage conversion is achieved, but power consumption increases
Solution Approach 1:
The patent merges the voltage conversion function with the existing output driver circuit by using a high voltage transistor whose source is coupled to the drain of a low voltage transistor. This integration eliminates the need for a separate level shifter circuit, thereby reducing chip area while maintaining voltage conversion capability from low voltage serial data to high voltage serial data output.
3Reliability
If a voltage level shifter is used to convert low voltage serial data to high voltage serial data, then voltage conversion is achieved, but timing jitter increases due to limited bandwidth
Solution Approach 1:
The patent merges the voltage conversion function with the existing output driver circuit by using a high voltage transistor whose source is coupled to the drain of a low voltage transistor. This integration eliminates the need for a separate level shifter circuit, thereby reducing chip area while maintaining voltage conversion capability from low voltage serial data to high voltage serial data output.
4Reliability
If a voltage level shifter is used to convert low voltage serial data to high voltage serial data, then voltage conversion is achieved, but signal integrity degrades
Solution Approach 1:
The patent merges the voltage conversion function with the existing output driver circuit by using a high voltage transistor whose source is coupled to the drain of a low voltage transistor. This integration eliminates the need for a separate level shifter circuit, thereby reducing chip area while maintaining voltage conversion capability from low voltage serial data to high voltage serial data output.
Data Source
AI summary
A low to high voltage conversion output driver. The low to high voltage conversion output driver has an output coupled to a first fixed voltage via a load device and comprises a current source, a low voltage transistor, and a high voltage transistor. The current source has one end coupled to a second fixed voltage. The low voltage transistor has a first terminal coupled to the other end of the current source, a second terminal receiving a low voltage data signal, and a third terminal. The high voltage transistor has a first terminal coupled to the third terminal of the low voltage transistor, a second terminal coupled to a bias source, and a third terminal coupled to the output.