As the world's population continues to soar, the problem of aging is becoming more and more serious, and the demand for medical diagnosis and nursing equipment continues to rise. However, current medical equipment is cumbersome, expensive, and energy intensive, and medical personnel need small, energy-efficient, and cost-effective medical diagnostic equipment.
In response to these challenges, National Semiconductor Corporation today announced the industry's first 8-channel ultrasonic transmit/receive chipset designed for portable ultrasound systems. According to sources from NSC, the innovative circuit architecture and highly integrated features of the PowerWise chipset enable engineers to design 128-channel portable ultrasound systems that are small, lightweight, clearer, and easier to diagnose.
Wu Haoqiang, the company's Asia-Pacific marketing director, believes that the design challenges of portable ultrasound systems come from the "power supply requirements" and "performance and image resolution". “Battery-powered portable systems must minimize energy consumption, but at the same time ensure that the battery is fully powered from start to finish while the device is running.†On the other hand, “small devices also ensure image resolution, even Excellent performance in the field."
It is reported that the chipset includes a receiving system analog front end circuit (AFE), a transmitting/receiving system switch, a transmitting system pulse generator, and a configurable transmitting system beamformer. NSC offers a variety of easy-to-use evaluation kits, reference schematics, and design tools, including the full WaveVision 5 data acquisition and analysis system with hardware and software, and an easy-to-use GUI interface that supports programming and control.
NSC's 8-channel chipset consists of four chips. Wu Yuqiang stressed that "the high performance and efficiency of the chipset comes from the interoperability between chips." For example, as long as the transmit system beamformer is reconfigured, the delay error between the board traces and the delay error of the pulse generator can be calibrated. This greatly improves distortion and allows the system to perform a second harmonic imaging; the transmit/receive system switches also give system designers greater flexibility in design, they can flexibly choose different bias currents. Set values ​​to make appropriate trade-offs between power consumption and performance.
The analog front-end circuitry features a unique architecture and is built with the industry's highest resolution digital variable gain amplifier (DVGA) and low power continuous-time Sigma-delta (CTSD) analog/digital converter (ADC). While ensuring image quality, you can also minimize the power consumption of the B mode, even 10% lower than the nearest competitor. Wu Xiaoqiang said that DVGA has many advantages that traditional analog variable gain amplifiers do not have. For example, each channel can be better calibrated and have better signal spectral performance; the CTSD ADC itself also has a brick wall aliasing signal filtering function. In contrast, analog front-end circuits using traditional pipelined ADCs have higher power consumption and lower ability to filter out aliased signals.
LM96511 receiving system analog front end circuit
The LM96511 analog front-end circuitry includes an 8-channel low noise amplifier, a digital variable gain amplifier, a 12-bit 40-50MHz ADC that supports LVDS data output, and eight demodulators to support CW Doppler beamforming. Features. The analog B-mode has a minimum power consumption of 110mW per channel, and each channel's gain can be aligned with each other, no more than +/-0.06dB (typ), ensuring a clearer picture quality. The built-in CW Doppler system has a dynamic range of 161dB/Hz, ensuring accurate measurements even in human organs such as the liver, where blood flow rates are extremely slow. The LM96511 has a package area of ​​187 square millimeters, which is 27% smaller than competing products.
LM96530 Transmitter/Receive System Switch
The LM96530 has eight built-in transmitter/receiver system switches with clamp diodes and can individually turn off individual channels. Its input reference noise is 0.5nV/sqrt Hz, and the on-resistance is 16? Can effectively improve the receiving sensitivity and image resolution of the system. The chip's package is four times smaller than the discrete solution, helping to reduce board size, and control functions are implemented through the daisy-chained SPI interface, which reduces the FPGA input/output (I/O) pins necessary to set parameters. .
LM96550 pulse generator
The LM96550 has eight damper-equipped pulse generators that generate +/-50V bipolar pulses with peak currents up to 2A and pulse frequencies up to 20MHz. The LM96550 continuously monitors the die temperature and outputs a shutdown logic signal when necessary to provide overtemperature protection for the system.
LM96570 beamformer
The built-in beamformer of the LM96570 chip produces only a small amount of signal jitter, and its peak-to-peak jitter is 25 ps lower than that of the beamformer used by the FPGA chip. This greatly improves the resolution of the B-mode scanned image while ensuring that continuous wave Doppler can be measured. Slower blood flow rate in the CW Doppler mode. The LM96570 chip can streamline the board layout so that system designers can place the chip directly next to the pulse generator. In contrast, if you connect the input/output pins (I/O) of the FPGA to a pulse generator, you must solve common routing problems.
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