Abstract: Some embodiments provide a system that performs a simulation within an electronic design automation (EDA) application. During operation, the system obtains a design from a user of the EDA application. Next, the system performs the simulation using the design to create a set of current simulation results associated with the design. The system then automatically saves a current design state of the design which is associated with the current simulation results. Finally, the system enables subsequent access to the current design state and one or more previous design states of the design by the user through a graphical user interface (GUI) associated with the EDA application.

Abstract: During a method, a hybrid graphical user interface (GUI), which is associated with electronic-design-automation (EDA) software, is displayed. This hybrid GUI allows users to efficiently specify useful analysis equations using textual and/or graphical information. In particular, the hybrid GUI has a first window that includes graphical objects associated with a circuit design. A user can select one or more of the graphical objects and associated electrical parameters using a user-interface device, such as a mouse. The hybrid GUI has a second window that has icons and other graphical controls that allow the construction of an analysis equation using the user-interface device.

Abstract: Some embodiments provide a system that performs a simulation within an electronic design automation (EDA) application. During operation, the system obtains a design from a user of the EDA application. Next, the system performs the simulation using the design to create a set of current simulation results associated with the design. The system then automatically saves a current design state of the design which is associated with the current simulation results. Finally, the system enables subsequent access to the current design state and one or more previous design states of the design by the user through a graphical user interface (GUI) associated with the EDA application.

Abstract: During a method, a hybrid graphical user interface (GUI), which is associated with electronic-design-automation (EDA) software, is displayed. This hybrid GUI allows users to efficiently specify useful analysis equations using textual and/or graphical information. In particular, the hybrid GUI has a first window that includes graphical objects associated with a circuit design. A user can select one or more of the graphical objects and associated electrical parameters using a user-interface device, such as a mouse. The hybrid GUI has a second window that has icons and other graphical controls that allow the construction of an analysis equation using the user-interface device.

Abstract: A precision voltage reference temperature compensated circuit 10 uses forward biased Zener diodes D2, D4 to provide a negative temperature coefficient compensation circuit and reverse biased Zener diodes D5-D6 to provide a positive temperature coefficient compensation circuit. Use of only Zener diodes results in a circuit 10 with fast recovery to the expected output voltage from transient events such as power supply perturbations, output load switching and/or gamma radiation events. The reference output voltage V.sub.out temperature characteristic is finally established by trimming resistors R3, R4 that are coupled between the current source including transistor Q1 and a positive temperature coefficient compensation circuit of diodes D5-D7. The precision reference output voltage level is finally established by trimming the resistors R5 and R6 that are coupled between the output of the temperature coefficient trim network and ground.