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In the world of electronics, fully sealed devices with no external interfaces have long been the ultimate goal for manufacturers. Especially in the realm of portable electronics, the dream of eliminating physical ports has driven innovation for years. Apple was once seen as a frontrunner in this race, but it wasn’t until recently that real progress began to emerge. The latest iPhone introduced wireless charging on a large scale, marking a significant step toward the vision of interfaceless devices.
At the same time, another key challenge—high-speed data transfer without wires—has started gaining attention. This is where Keyssa, a Silicon Valley-based company founded in 2009, has made its mark. With over 200 patent applications, Keyssa is redefining how we connect devices. Their breakthrough technology, KissConnectivity, uses ultra-high frequency (EHF) to enable fast, secure, and low-power data transmission between devices.
In September, Keyssa launched two new contactless connection solutions: KSS104M and KSS104M-CW. The KSS104M features a compact 3x3mm package with an integrated antenna, supports multiple high-speed protocols like USB 2.0, and can run at up to 6 Gbps. It also improves electrical and mechanical tolerance while reducing power consumption. The KSS104M-CW is a ready-to-use module designed to simplify integration into mobile and other systems, meeting critical electromagnetic and mechanical requirements.
According to Steve Venuti, Keyssa’s Vice President of Marketing, these solutions are not just about removing cables—they’re about transforming industrial design and manufacturing processes. "The old mechanical connectors were a limitation, but now we're breaking through," he said. He showcased devices with no visible connections, such as mobile hard drives and portable computers, highlighting the potential for widespread adoption.
Keyssa is also working with partners like Foxconn’s Hongsheng Precision Technology (FIT) to build scalable, cost-effective modules. The Connected World program, a collaboration between Keyssa, Foxconn, and Samsung, aims to redefine how next-gen devices share data without Wi-Fi or cables. By simplifying engineering and design, it enables faster time-to-market and better reliability.
Tony Fadell, the inventor of the original iPhone, praised the vision behind the technology: “We’ve only scratched the surface of what’s possible. Soon, we’ll see gigabit-level transfers between cars, homes, and phones, all without expensive data plans.â€
This is more than just a tech advancement—it's a shift toward a truly connected future, where cables and mechanical connectors become obsolete, without sacrificing speed, security, or performance.
Digital Amplifier Module​
The Digital Amplifier Module is a crucial component in the field of audio, delivering exceptional audio amplification for various audio devices. Leveraging digital signal processing technology, it enables precise manipulation of audio signals, achieving performance enhancements that are difficult to match with traditional analog Power Amplifiers.​
Working Principle​
The operation of the Digital Amplifier Module is highly sophisticated. First, upon receiving an analog audio signal, the module rapidly converts it into a digital signal through an Analog-to-Digital Converter (ADC). These digital signals then undergo a series of meticulous processes in the Digital Signal Processor (DSP), such as filtering, equalization, and reverb, to optimize the sound quality. Subsequently, the processed digital signals are converted back into analog signals by a Digital-to-Analog Converter (DAC), and finally, power-amplified by the output stage amplifier to drive the speaker to produce sound. For instance, in a common Class-D amplifier, the power output transistors operate in a switching state, controlling the power output by adjusting the duty cycle of a fixed-frequency rectangular pulse, which significantly improves efficiency.​
Product Advantages​
.High Efficiency and Energy Conservation：Compared with traditional analog power amplifiers, digital amplifier modules are extremely efficient, generally reaching over 90%. Take a certain digital power amplifier module as an example; when outputting the same power, its energy consumption is only about half that of a traditional analog power amplifier, greatly reducing energy consumption. This makes it especially suitable for devices with strict power consumption requirements.​
.High-Fidelity Sound Quality：With advanced digital signal processing technology, it can precisely process audio signals, effectively reducing signal distortion and restoring the original details of the audio, thus providing a high-fidelity auditory experience. In professional music recording and playback equipment, digital amplifier modules can accurately reproduce every note of the music, making the audience feel as if they were at the live performance.​
.Compact Size and Lightweight：Thanks to the digital design and highly integrated chip technology, digital amplifier modules have been significantly reduced in size and weight. This feature has led to their extensive application in portable audio devices, such as Bluetooth speakers and headphone amplifiers, making them convenient for users to carry.​
Application Scenarios​
.Home Audio Systems：It can be used to build home theaters and Hi-Fi audio systems, providing users with an immersive music and movie sound experience. Whether enjoying the thrilling sound effects of a blockbuster movie or listening to beautiful music, digital amplifier modules can deliver excellent audio performance.​
.Car Audio：In the limited interior space of a car, where high power is required, digital amplifier modules can effectively enhance the sound quality of car audio systems with their high efficiency and compact size, creating a high-quality auditory environment for drivers and passengers.​
.Professional Audio Fields：In places like recording studios and performance stages, where extremely high requirements are placed on the sound quality and stability of audio equipment, the high-fidelity and reliability of digital amplifier modules make them an ideal choice for professional audio devices, meeting the stringent audio quality standards of professionals.​
In conclusion, with its unique advantages, the Digital Amplifier Module plays a vital role in the audio field, offering high-quality audio amplification solutions for audio enthusiasts and professionals alike, and continuously driving the development and innovation of audio technology.
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