Hybrid Driver Circuit for Wide Output Amplitude Control
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Solution Overview
Problem
Current driver designs have limited output signal level ranges, making them inadequate for supporting a wide range of distances and data rates in chip-to-chip communication, as they either cannot achieve high enough signal levels for long distances or low enough signal levels for short distances.
Innovation Solution
A hybrid driver architecture that combines NFET and PFET architectures, allowing the driver to switch between N-over-N and P-over-N modes to achieve a wide output signal level range by adjusting the voltage and using a hybrid LDO regulator with both NFET and PFET pass transistors to regulate voltage effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a driver uses a single architecture (N-over-N or P-over-N), then the circuit design is simple, but the output signal level range is limited
Solution Approach 1:
The patent combines both N-over-N and P-over-N driver architectures into a single hybrid driver circuit. The circuit includes both NFET-based pull-up/pull-down transistors and PFET-based pull-up/pull-down transistors, allowing the driver to access both architectural approaches within one unified design, thereby expanding the output signal level range without requiring separate driver circuits.
Solution Approach 2:
The hybrid driver dynamically switches between N-over-N and P-over-N modes based on the required output signal level. Control logic selectively activates either the NFET path or the PFET path, enabling the driver to adapt its characteristics in real-time to match the communication distance and data rate requirements, thus achieving wide output amplitude range.
2Length of moving object
If a driver increases output signal level for long distances, then communication range is improved, but power consumption increases
Solution Approach 1:
The hybrid driver changes the electrical parameters of the driver circuit by switching between NFET and PFET configurations. Different transistor types have different threshold voltages and transconductance characteristics, allowing the driver to optimize the output signal level for each communication scenario, achieving adequate signal strength for long distances while avoiding excessive power consumption by selecting the appropriate transistor type for each condition.
3Use of energy by moving object
If a driver decreases output signal level for short distances, then power consumption is reduced, but signal strength becomes insufficient
Solution Approach 1:
The driver utilizes the different electrical characteristics of NFETs and PFETs to adjust output signal parameters. When short-distance communication is detected, the driver selects the transistor configuration that provides lower output amplitude, reducing power consumption while maintaining sufficient signal strength for reliable communication. The hybrid architecture ensures that signal strength requirements are met even at reduced power levels.
Data Source
AI summary
In certain aspects, a driver includes a pull-down transistor coupled between an output and a ground, a pull-up n-type field effect transistor (NFET) coupled between a first voltage rail and the output, and a pull-up p-type field effect transistor (PFET) coupled between the first voltage rail and the output. The driver also includes a first switch coupled between a gate of the pull-up NFET and the ground, and a second switch coupled between a gate of the pull-up PFET and a second voltage rail.