Chapter 5. Product Structure 5 - 17
• AD converter 8 (ADS5282, 8CH)
• BF ASIC 4 (MCB124,16CH)
• RX Dynamic Aperture
• RX Apodization
• BFIC controlling
• Synthetic Aperture
• Trapezoidal imaging
• Multi-line receiving
• TX Focal point
▌ Operational Principles
TX Pulser
Exciting pulse data provided by the BF ASIC (MCB124) go through the TX Pulse Buffer
and are provided to the TX Pulser (MAX4811). The TX Pulser uses the high voltage
provided by the DC-DC Module and exciting pulse data to generate Bipolar Pulser.
Bipolar Pulser uses PSA (Probe Select Assembly) to send to the Probe Element, thereby
generating ultrasonic waves.
Receive Channel
The Receive Channel serves the function of an Analog Digital Converter, which enables
Beamforming by amplifying the echo propagated through, and reflected from, the media
of human body.
It consists of a Limiter, a Pre-Amp, a TGC-Amp, a Low-Pass Filter, and an A/D Converter.
1) Limiter
This removes unnecessary signals from the echo signals returned through the PSA
(Probe Select Assembly)’s High Voltage Switch. Tx Pulse up to 180 Vpp and echo signals
of a few mV are mixed together, but since the RX data actually needed are echo signals
of extremely small magnitude in mV range, the Tx Pulse must be eliminated before they
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