Acoustic Transducer Amplifier Integration for Signal Loss Reduction
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Solution Overview
Problem
Electrical signals transmitted via leads from packaged acoustic transducers to external amplifiers are subject to loss, noise, and interference due to the length of the interconnect, reducing the receiving sensitivity of acoustic devices.
Innovation Solution
A device configuration featuring a lead frame with an aperture, a semiconductor die mounted on it, an acoustic horn integrally connected to the lead frame, a substrate with an amplifier mounted on its base portion, and a lid that defines a cavity housing the transducer and amplifier, optimizing signal coupling and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the acoustic transducer is packaged with an external amplifier connected via lead or wire, then the device structure is simple and easy to manufacture, but the electrical signal is subject to loss, noise and interference due to the length of the interconnect lead
Solution Approach 1:
The amplifier is integrated within the acoustic transducer package, merging two previously separate components (transducer and amplifier) into a single unified device. This eliminates the need for external leads and interconnects, thereby reducing signal loss, noise, and interference while maintaining a compact and manufacturable structure.
Solution Approach 2:
A lead frame is introduced as an intermediary structure that provides both mechanical support and electrical connection pathways within the package. The lead frame enables direct electrical coupling between the acoustic transducer element and the amplifier, eliminating the need for external wire interconnects and reducing signal degradation.
2Reliability
If a lead or wire is used to transmit electrical signals from the packaged acoustic transducer to the external amplifier, then the device is easy to manufacture, but the receiving sensitivity is reduced due to noise and interference
Solution Approach 1:
By integrating the amplifier within the transducer package, the invention eliminates external wire interconnects that cause noise and interference. This improves receiving sensitivity while maintaining ease of manufacture through a streamlined, single-package construction that reduces assembly steps.
3Loss of energy
If the acoustic transducer and amplifier are positioned within a cavity defined by the housing and lid, then signal coupling is optimized and interference is reduced, but the device complexity increases
Solution Approach 1:
The housing and lid are integrated to form a unified cavity structure that encloses both the acoustic transducer and amplifier. This merged enclosure optimizes signal coupling and protects against interference while maintaining a compact form factor that does not significantly increase overall device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration efficiently couples electrical signals between the acoustic transducer and amplifier, minimizing signal loss and noise, thereby enhancing the sensitivity of the acoustic device.
Implementation Method 1
acoustic transducers convert received electrical signals to acoustic signals when operating in a transmit mode, and/or convert received acoustic signals to electrical signals when operating in a receive mode
Implementation Method 2
acoustic transducers convert received electrical signals to acoustic signals when operating in a transmit mode
Data Source
AI summary
A device includes: a lead frame having an aperture in a central portion thereof; at least one acoustic transducer mounted on the lead frame above the aperture and configured to convert between acoustic energy and an electrical signal with low signal losses; a housing connected to the lead frame and including a base portion on a same side of the lead frame as the acoustic transducer; an amplifier is provided on a base portion of the housing in close proximity to the acoustic transducer; and a lid configured together with the base portion of the housing to define a cavity, wherein the acoustic transducer and the amplifier are closely positioned within the MEMS device cavity.