The Research On Characteristics And Application Of Differential Cascade Voltage Switch Logic Structure

Single-event effects and hardware Trojans are both hot topics to study the reliability and safety of integrated circuits in recent years. Semiconductor devices hit by high-energy particles will lead its sensitive nodes to produce false flip, resulting in the wrong data storage, and even causing the system to operate incorrectly. Some hardware Trojans circuits are added artificially in the integrated circuit design and manufacturing process, which will cause the circuit failure or steal confidential information. So highly requirements are needed to guarantee the reliability and safety of integrated circuits.Based on the analysis of Differential Cascade Voltage Switch Logic (DCVSL) structure,this paper studies the propagation characteristics of single-event transient and the influence of hardware Trojans in DCVSL structure, and verifies that DCVSL structure is feasible in hardware Trojan detection. The main contents are as following:1.The relationship between the delay of DCVSL structure and the width of MOS transistor is deduced by the formula, and the width ratio of nMOS and pMOS minimization delay of DCVSL structural logic gate is calculated manually. Then the HSPICE simulation is used to optimize the ratio of the manually calculated MOS transistor. The results show that the width of nMOS is wider than that of pMOS in DCVSL structure, which lays the foundation for the discussion and analysis of single-event effect in DCVSL structure circuits.2. Based on the existing device model, the device model of nMOS and pMOS was established by adjusting the device parameters, and the obtained 3D device model and SMIC90nm HSPICE model were calibrated. The mixed simulation of TCAD and HSPICE was used to observe the differences of the single-event transient effects induced by heavy ion in CMOS and DCVSL structures.3. Single-event transient pulse in the propagation process of combinational circuit will broaden. In this paper, an equivalent transient current model is used to simulate the transient current of single-event. The propagation-induced pulse broadening(PIPB)effect of logic gate chains in CMOS and DCVSL structures is simulated and analyzed by HSPICE under load imbalance and threshold voltage asymmetry. The results show that in the case of maintaining symmetrical structure, the DCVSL structure has the characteristics of suppressing the propagation-induced pulse broadening effect compared with CMOS.4. When the inputs of DCVSL structure circuits are complementary, the transient current has only spikes; and when the inputs are not complementary, the transient current has a short-circuited current in addition to the spikes. The activated hardware Trojans cause DCVSL structure circuits to appear non-complementary state. Using the difference of transient current of the DCVSL circuit under the complementary and non-complementary state can detecte whether there are hardware Trojans in test circuits.The influence of process variation on the application of DCVSL structure in hardware Trojan is analyzed by observing the separation of the average current space distribution of Monte Carlo analysis of the test circuits. At the same time, the library cell of DCVSL structure is established by using the library characterization tool, by analyzing the average power consumption and peak power consumption under Trojan activation and inactivation of the test circuits, the circuits embedded hardware Trojans can be detected.And eventually the feasibility of DCVSL structure in hardware Trojan detection is verified.