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EchoeScan's area of engineering expertise  is broad-based, incorporating elements of ultrasound physics, real-time signal and image processing, optimal filtering, control theory, computer modeling, circuit theory, and electronic design.  
TRANSMIT TECHNIQUES

We have particular expertise in the development of arbitrary waveform  generators (AWG) for ultrasound excitation. This also includes use of  inverse filtering for broadening the bandwidth of piezoelectric transducers. EchoeScan's  innovative solution for transmit beamforming makes the benefits of AWGs  available to midrange and entry-level machines. To learn about the the industry's first PWM transmit beamformer IC,  click here.
RECEIVE PROCESSING

Having in-depth knowledge in various aspects of ultrasound front-end processing, we have proposed unique variable-gain, low-noise charge preamplifier as well as several novel architectures  for both BJT and CMOS LNAs. Our expertise also includes conceptual analysis of phase-insensitive receive beamformer and Mathcad modeling of a piezoelectric  transducer connected via coaxial cable. Furthermore,  EchoeScan  has substantial experience in signal conditioning for single antenna intravascular MRI.
DOPPLER IMAGING

EchoeScan has a wide range of experience in ultrasound Doppler applications, including data acquisition, beamforming, wall filtering, and Doppler shift estimation.
PROJECTS EXAMPLES

The projects listed below are representative examples of work completed by EchoeScan. These projects have been successfully transferred to our clients for silicon  implementation.
Ultrasound Transmit Beamformer Integrated Circuit and Method (TBF)
Low Noise Binary-Codded Gain Amplifier and Method for Time-Gain Compensation in Medical Ultrasound Imaging (TGC)
Low-Noise Ultrasound Method and Beamformer System for Doppler Processing (DBF)
The TBF embodies a complete transmit channel driven by PWM waveforms stored in a conventional sequence memory.  PWM signals controls the transmit pulse envelope (shape) by changing the duty cycle of the carrier. The circuitry allows high precision (beyond sampling rate) phase rotation of the carrier. It also provides transmit apodization. Implementing such an IC makes the benefits of digital transmit beamformers  available to midrange and entry-level machines since it merely requires a modified programming of the sequence memory.
The TGC circuit represents a low noise binary-coded gain amplifier having its amplification factor progressively increased during the penetration of the transmitted pulse into a patient’s body. This allows enhancing both the system dynamic range and SNR. 

The DBF is a segment of CW Doppler receive beamformer. It is aimed to receive a plurality of RF signals, to convert the RF to an IF, to provide the relative phasing of the IF outputs across the channels, and to sum the per-channel phase-shifted outputs.  The above operations are implemented within a frequency range where the flatband noise sources are dominate even in MOS structures. It allows to get a sufficient SNR without a high gain LNA, i.e., using low-voltage process technologies.

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