Extended Data Fig. 2: Schematics and control sequence of ultrasonic sensing.
From: A fully integrated wearable ultrasound system to monitor deep tissues in moving subjects
a, Block diagram and signal transmission lines between the functional modules. The control circuit includes two parts: the AFE and the wireless DAQ module. The AFE consists of a multiplexer (Mux), a transmit/receive switch (T/R SW), a receiver, a sequencer, and a pulse generator. The DAQ module consists of a microcontroller (MCU) with an on-chip analog-to-digital convertor (ADC), and a Wi-Fi transmitter. The dashed lines are for digital signal transmission and the solid lines are for analog signal transmission. b, Simulated control sequence for multiplexing and pulse-echo sensing, which shows the time sequence of the receive (Rx) enable, trigger, high-voltage (HV) pulse, clock (CLK), reset (RES), digital input (Din), and latch enable (\(\overline{{\rm{LE}}}\)) signals. c, Signals acquired by an oscilloscope showing the control sequence of the pulse-echo sensing and transducer multiplexing. d, Signals acquired by an oscilloscope showing the input sequence to the shift register for multiplexing and driving the transducer elements. All figure panels share the same color encoding scheme.
