5 - 20 HS70A Service Manual
human body.
1) LNA: It amplifies the received signal.
2) Delay & Focusing: It combines Rx input signals from 29 channels as a single signal.
3) Mixer: To detect Doppler signals, it mixes RF signal and signal which has the same
transmission frequency.
4) I/Q Signal: To find a direction of blood flow, enter a signal which has 90 ° phase
difference from the standard signal.
5) Audio Circuit: After mixing, remove the higher frequency element for the signal to get
the Doppler frequency signal.
6) ADC: It converts a digital signal to an analog signal.
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