The Circuit Design Of The Ultral-narrow Pulse Synthesis And Ultra-fast Edge Generation

The ultra-fast edge pulse signal is the main signal type of the high-end signal generator,which is used in electronic equipment testing widely.The demand for pulses is getting higher and higher with the development of the related technology.Also,it is in two aspects.The one is "ultra-fast" edge and the other is "ultra-narrow" pulse width.In addition,foreign countries have leading technology in this field and the domestic is relatively late.So relevant technical research is needed urgently.The research of this thesis is based on high-speed pulse signal generation technology,designed a pulse synthesis circuit with ultra-narrow width of 100 ps and an ultra-fast edge generation pulse circuit with rise time of 40 ps.This paper includes the following aspects mainly:(1).The design of synthetic circuit of ultra-narrow pulses under ultra-low repetition rate conditions: To study the ultra-narrow pulse technology.In the subject,the pulse width varies widely and the accuracy is highly.The synthesis of ultra-narrow pulses is achieved by means of relative delay control.A three-stage delay dual path is designed by means of precision delay chip,which consists of the initial delay,the sub-delay and the precision delay.The two-way design can reduce the time difference.Finally,the circuit achieves precise delay from picosecond to nanosecond.A pulse width pre-compression circuit is constructed by a high-speed D flip-flop to achieve one-step compression of pulse width.Finally,the ultra-narrow pulse signal is generated by the synthesis circuit composed of T flip-flop.(2).The design of the ultra-fast edge pulse waveform preprocessing module: The module provides a suitable pre-compressed pulse signal for the compression circuit.Firstly,the amplitude/level conditioning technique is introduced.Secondly,using the nonlinear conditioning technology,a pre-processing circuit based on the bias tree and amplifier is designed to adjust the level and amplitude of the digital waveform.Finally,continuous adjustment of the level and amplitude within a certain range is achieved.(3).The design of ultra-fast edge generation circuit: Firstly,the ultra-fast edge technology is studied,and the nonlinear transmission line along the compression technology and compression technology of the step recovery diode edge are analyzed.Secondly,a variable capacitance nonlinear transmission line model is designed,which can provide 30 compression circuits.The circuit verifies the compression capability of the transmission line.Finally,project analyze on the structure and reverse characteristics of the step recovery diode and optimize the classical circuit.Design the amplitude controllable fast edge with 150ps' s rise time,and then design the ultra-fast of 40ps' s pulse width edge generation circuit.Finally,the ultra-narrow pulse synthesis of 100 ps pulse width and the ultra-fast edge generation of 40 ps rise time are realized after the design and debugging.Also,the target indicator requirements have been completed.