Design scheme of portable ultrasonic system

As the world's population continues to soar, and the problem of aging is becoming more and more serious, the demand for medical diagnostic and nursing equipment worldwide continues to rise, especially for high-end medical electronic products such as computer tomography scanners, magnetic resonance scanners, and high-end ultrasonic diagnostic instruments. The rapid growth has effectively driven the expansion of the global medical electronics market. However, most of the current medical equipment is bulky, expensive, and consumes a lot of energy, which cannot meet the needs of medical personnel. Therefore, the demand for medical diagnostic equipment in the medical electronics market that is small in size, high in energy efficiency, and extremely cost-effective appears particularly urgent.

Ultrasonic system design challenges

The portable ultrasound system is a standing medical device in hospitals, clinics, ambulances and ambulance stations in remote areas. As a market where portable medical devices are widely used, portable ultrasound systems also face design challenges of miniaturization and low power consumption. Users expect to maintain acceptable image quality while meeting portable size and runtime requirements. This requires designers to reduce energy consumption as much as possible, but at the same time, it must ensure that the battery can provide sufficient power throughout the operation of the device to ensure the image resolution and ensure that the device can perform excellent performance during field operation.

“National Semiconductor ’s high-efficiency simulation technology makes the above expectations possible.” Mr. Weiqiang Wu, National Semiconductor ’s Asia Pacific Marketing Director, said, “Innovative PowerWise design can ensure that the battery can support the device to run for a long time; meanwhile, continuous time Sigma-delta simulation / Digital converter technology and digital variable gain amplification technology can improve image resolution. In addition, the advanced chip packaging technology of National Semiconductor makes the chip have lower noise and smaller volume. "The National Semiconductor analog subsystem solution is adopted The portable ultrasound system can achieve high-resolution images, play a performance comparable to large instruments, ensure that doctors make accurate diagnoses, and help reduce the size of the solution, reduce power consumption and system costs, and have a competitive advantage.

Perfect ultrasonic system solution

National Semiconductor introduced the industry's first 8-channel ultrasonic transmit / receive chipset specifically designed for portable ultrasonic systems. The innovative circuit architecture of this PowerWise chipset can help engineers design portable ultrasound systems with longer battery life and image resolution comparable to large ultrasound scanners.

The 8-channel transmit / receive chipset consists of 4 chips. The inter-chip cooperation enables the chipset to achieve unmatched ultra-high performance and efficiency. It contains all necessary circuits for the ultrasonic system, including the receiving system analog front-end circuit (AFE), transmitting / receiving system switch, transmitting system pulse generator and configurable transmitting system beamformer. Its highly integrated features allow system designers to use the chipset to develop a 128-channel portable ultrasound system that is small and light, with clearer images and easier diagnosis based on it.

The chipset's analog front-end circuit uses a very unique architecture, which not only ensures superior image quality, but also reduces the power consumption of B mode as much as possible, even 10% lower than the nearest competitor. This analog front-end circuit also includes the industry's highest resolution digital variable gain amplifier (DVGA) and low power continuous-time sigma-delta (CTSD) analog / digital converter (ADC). In addition, digital variable gain amplifiers have many advantages that traditional analog variable gain amplifiers do not have. For example, each channel can be better calibrated and have better signal spectrum performance. The continuous-time Sigma-delta ADC itself also has a brick wall type aliasing signal filtering function. National Semiconductor provides a fully functional demonstration system and evaluation kit for this analog front-end circuit, helping system developers shorten development cycles and save development costs.

Mr. Wu said that the introduction of this 8-channel ultrasonic transmitter / receiver chipset designed by National Semiconductor ’s high-efficiency simulation technology and innovative PowerWise will definitely improve the situation of traditional portable ultrasound diagnostic equipment, which is inferior to large-scale diagnostic equipment. , Open up new fields for the majority of system developers involved in medical electronic equipment.

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