Intermediate-frequency ultrasonic signal processing application system received by energy converter
A signal processing and application system technology, applied in the field of ultrasound, can solve the problems of high AD chip, complex circuit, and limitation of ultrasonic signal sampling frequency, etc., and achieve the effect of reducing components, reducing design difficulty, reducing cost and application difficulty
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Embodiment 1
[0036] The invention adopts a dual-channel voltage feedback amplifier and a four-stage amplification filter sampling method of an RF power detector to realize the detection of ultrasonic reflection signals.
[0037] The present invention adopts a special amplifier, that is, a logarithmic detector, as a post-stage signal processing. The peripheral circuit of the special signal amplifier is simple, and the routing requirements of the signal line on the circuit board are not high, and the signal processed in the above four steps can be directly processed by frequency. The conversion between the domain and the time domain directly obtains the envelope of the effective signal, and the converted signal can be read and sampled by a general-performance ADC chip or an ADC module integrated on the MCU to obtain effective data.
[0038] An intermediate frequency ultrasonic signal processing application system received by a transducer according to the present invention includes:
[0039] ...
Embodiment 2
[0059] Embodiment is a modification of embodiment 1
[0060] The ultrasonic reflection signals SONAR_A and SONAR_B in the signal sampling circuit are sampled by the filter capacitor and the half bridge, and the signal is loaded on both ends of the resistor R47 to form a differential signal, and the differential signal is input to the RC filter circuit again to obtain the differential signal into the first-level signal amplification circuit middle.
[0061] In the signal sampling circuit, the amplifier sampling dual power supply works
[0062]After the output signal is low-pass filtered by resistors R45 and R48 to remove burrs and noise signals, it is input to the second and third pins of the amplifier U8 to amplify the signal by 100 times and output it. The signal measurement point E5 can measure the amplified signal. The amplified signal is input to the sixth pin of the amplifier U8 to increase the output impedance of the signal. The output signal can be measured at the sign...
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