Hybrid Transmitter Driver With Waveform Switching for Low-Power Sensing
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Solution Overview
Problem
Capacitive sensing devices face challenges in achieving high sensitivity and signal-to-noise ratio while minimizing power consumption, as sine wave generators used for better performance consume more power, which is a concern for mobile applications.
Innovation Solution
A hybrid transmitter driver that operates in different modes, switching between sine wave and square wave generators based on current requirements, using multiplexers to select the appropriate signal generator for the output stage driver, allowing for efficient power management and sensitivity adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sine wave generator is used as a signal transmitter, then sensitivity and signal-to-noise ratio are improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic switching between sine wave generator and square wave generator based on operational needs. The system transitions from static signal generation to dynamic selection, allowing the transmitter to adapt its waveform type according to current operational requirements, thereby optimizing the balance between sensitivity and power consumption.
Solution Approach 2:
The patent changes the waveform parameter (sine wave vs. square wave) of the transmitted signal based on operational mode. By modifying this key parameter dynamically, the system achieves different performance characteristics - high sensitivity mode uses sine waves while low-power mode uses square waves, effectively resolving the contradiction between measurement precision and energy consumption.
2Measurement precision
If a sine wave generator is used as a signal transmitter, then signal-to-noise ratio is improved, but power consumption increases
Solution Approach 1:
The system dynamically selects between sine wave and square wave generators based on real-time operational requirements. This dynamic adaptation allows the system to maintain high signal-to-noise ratio when needed while conserving power during normal operation, eliminating the need to continuously consume high power for sine wave generation.
Solution Approach 2:
The patent modifies the waveform parameter of the transmitted signal based on operational mode. By switching between sine waves (high signal-to-noise ratio) and square waves (lower power consumption), the system optimizes the signal quality metric while managing power consumption effectively.
3Use of energy by moving object
If power consumption is reduced by using a square wave generator, then energy efficiency is improved, but sensitivity and signal-to-noise ratio deteriorate
Solution Approach 1:
The patent implements dynamic switching capability that allows the system to transition between square wave mode (low power) and sine wave mode (high sensitivity) based on operational requirements. This dynamic adaptation ensures that sensitivity is only reduced when absolutely necessary for power conservation.
Solution Approach 2:
The system changes the waveform parameter dynamically - using square waves for power efficiency and sine waves when sensitivity is required. This parameter modification allows the system to achieve both low power consumption and high sensitivity at different times, rather than being locked into one compromise state.
4Use of energy by moving object
If power consumption is reduced by using a square wave generator, then energy efficiency is improved, but signal-to-noise ratio deteriorates
Solution Approach 1:
The patent enables dynamic switching between square wave and sine wave generation based on operational mode. This dynamic capability allows the system to maintain energy efficiency while temporarily improving signal-to-noise ratio when measurement accuracy becomes critical.
Solution Approach 2:
The system modifies the waveform parameter to switch between square waves (energy efficient) and sine waves (better signal-to-noise ratio). This parameter change allows optimal signal quality to be achieved when needed without permanently sacrificing energy efficiency.
Data Source
AI summary
A hybrid transmitter driver works in a first operation mode or a second operation mode and includes an operational amplifier, a pre-driver, a first multiplexer, a second multiplexer and an output stage driver. After receiving a signal from the first signal generator, the operational amplifier outputs a first driving signal and a third driving signal. After receiving a signal from the second signal generator, the pre-driver outputs a second driving signal and a fourth driving signal. In the first operation mode, the first multiplexer outputs the second driving signal and the second multiplexer outputs the fourth driving signal to make the output stage driver output a first transmission signal. In the second operation mode, the first multiplexer outputs the first driving signal and the second multiplexer outputs the third driving signal to make the output stage driver output a second transmission signal.