MCP37D11T-80ESLASHTE datasheet(61/136 Pages) MICROCHIP

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 2020 Microchip Technology Inc.

DS20006381A-page 61

MCP37D11-80: 80 MSPS 12-BIT PIPELINED ADC

4.10

Continuous Wave (CW)

Beamforming and Ultrasound

Doppler Signal Processing Using

CW Octal-Channel Mode

(MCP37D11-80 only)

In modern ultrasound medical applications, large

numbers of transducers are often used. The signals

from these sensors are then coherently combined for

higher transducer gain and directivity. The signals from

each sensor arrive at the detection device with a

different time delay. Also, in multi-channel scanning

operations using the MUX, there is a time delay

between acquiring input signals (see Section 4.8.1

“Fractional Delay Recovery for Dual- and Octal-

Channel Modes”). These time delays may need to be

corrected before all input signals are combined for the

signal processing.

Digital beamforming is a digital signal processing

technique that requires summing all input signals from

different channels after correcting for time delay. The

time-delay correction involves the phase alignment of

the detected signals with respect to a reference.

Along with beamforming, many modern medical

ultrasound devices support Doppler imaging, which

processes phase information in addition to the classical

magnitude

detection

(for

brightness

imaging).

Ultrasound Doppler signal processing is used to

determine movement in the body as represented by

blood flow, which can help diagnose the functioning of

a heart valve or blood vessel, etc. In a traditional

ultrasound system, all of these functions are typically

accomplished with discrete components. Figure 4-24

shows an example of an ultrasound system

implementation using various specialized components.

FIGURE 4-23:

Example of Ultrasound System Building Block.

T/R

Switcher

Transducer

Array

HV MUX and

T/R Switches

AAF

Isolation

Clocks

Beamformer Central

Control Processor

I/Q

Processing

DAC

ADC

Doppler

Processing

Amp

ADC

VGA

LNA

Image and

Motion

Processing

(B Mode)

Color

Doppler

Processing

(F Mode)

Amp

Digital RX Beamformer

Video DAC/

Video Encoder

Video

Compression

Amp/

Filter

Amp

Audio

DAC

LNA-VGA-ADC Array (up to 256 Channels)

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