Dual-Amplifier Hearing Prosthesis Circuit for Low-Power Signal Output
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Solution Overview
Problem
Current hearing prostheses face challenges in efficiently amplifying electrical signals for sound perception, particularly in varying hearing loss conditions, where existing solutions often compromise on power efficiency, compactness, and frequency-dependent impedance characteristics.
Innovation Solution
The proposed solution involves an output amplifier stage with a combination of a step-up converter and a class-D amplifier, along with a controller that dynamically switches between different operational modes and amplifiers based on power supply characteristics, input/output signal levels, and device impedance, allowing for efficient amplification of electrical signals for stimulation components in hearing prostheses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a traditional amplifier is used in hearing prostheses, then signal amplification is achieved, but power consumption increases and device compactness is compromised
Solution Approach 1:
The patent implements dynamic switching between two amplifier circuits (first and second amplifier circuits) based on operating conditions. The controller selectively activates the appropriate amplifier circuit depending on the required output power and impedance conditions, optimizing power consumption by using the more efficient circuit when conditions permit while maintaining amplification capability when needed.
Solution Approach 2:
The patent changes operational parameters by switching between different amplifier configurations with different characteristics. The first amplifier circuit operates under certain impedance conditions while the second amplifier circuit operates under different impedance conditions, allowing the system to adapt to varying load conditions and optimize power efficiency across different operating scenarios.
2Power
If amplifier circuitry is added to improve signal amplification, then amplification performance improves, but device complexity and size increase
Solution Approach 1:
The patent divides the amplification function into two separate amplifier circuits, each optimized for specific operating conditions. Rather than using one complex amplifier that must handle all conditions, the system segments the amplification task into two simpler circuits that can be selectively activated, reducing overall system complexity while maintaining high performance.
Solution Approach 2:
The controller provides multi-functionality by managing both amplifier circuits and selectively activating the appropriate one based on operating conditions. This universal control mechanism allows the system to achieve high amplification performance across different scenarios without requiring each amplifier circuit to be independently complex.
3Device complexity
If a single amplifier circuit is used, then device simplicity is maintained, but adaptability to different impedance conditions is reduced
Solution Approach 1:
The system dynamically adapts to different impedance conditions by switching between the first and second amplifier circuits based on real-time impedance measurements. This dynamic adaptation allows the system to maintain optimal performance across varying load conditions while keeping each individual amplifier circuit relatively simple in design.
Data Source
AI summary
A hearing prosthesis circuit includes a power source, a first amplifier coupled to the power source, and a second amplifier coupled to the power source. The circuit also includes a stimulation component coupled to the first amplifier and the second amplifier. The stimulation component is configured to provide an output in accordance with an electrical signal that includes audio data. Further, the circuit includes a controller coupled to the first amplifier and the second amplifier. The controller is operable in accordance with a first operational setting to use the first amplifier to provide the electrical signal to the stimulation component and the controller is also operable in accordance with a second operational setting to use the second amplifier to provide the electrical signal to the stimulation component. Generally, the first amplifier provides greater signal amplification of the audio data than the second amplifier.