Design And Implementation Of Adjustable Ultrasonic Signal Generator Based On FPGA

Ultrasound is used for neuromodulation studies of neuropsychiatric disorders such as Parkinson's,epilepsy,and depression because of its advantages of non-invasiveness and high spatial resolution.In traditional ultrasound neuromodulation experiments,most neuromodulation instruments use function generators and power amplifiers to generate frequency-adjustable,power-adjustable,pulse-adjustable ultrasonic excitations.However,this method has the disadvantages.For example,pulse parameters are difficult to adjust,the instrument is bulky,the cost is high,and only physical focusing is supported.For this purpose,a field-programmable gate array(FPGA)was designed to implement a neural-adjusted ultrasonic signal generation system,and an ultrasonic signal was realized by a direct digital synthesizer(DDS)technology to achieve high-precision output.Specifically,the main work of this article is as follows:1 Designed and implemented a dual-channel ultrasonic signal generator.The EP4CE chip core control unit can be controlled by the keyboard and displayed on the LCD screen to achieve real-time detection of ultrasonic signal output power and ultrasonic signal acquisition.Output ultrasonic pulse excitation is between 0.5MHz-5MHz,pulse repetition frequency(PRF)is adjustable between 0.2KHz-2KHz,output power is adjustable from 0-50W.2 Designed a multi-channel ultrasonic signal generator.Using CycloneV 5CGX series chips,the system supports 203-channel.Output ultrasonic pulse excitation is between 0.5MHz-5MHz.Each channel output power is 1.5W.Arbitrary channel phase can be controlled to achieve focusing algorithm and phase control accuracy can reach ns level.