Method and device of analyzing crosstalk effects in an electronic device

• US 7,469,391 B2
• Filed: 11/30/2005
• Issued: 12/23/2008
• Est. Priority Date: 11/30/2004
• Status: Expired due to Fees

• Current Assignee: Infineon Technologies AG
• Original Assignee: Infineon Technologies AG
• Inventors: Sanders, Birgit, Pedron, Pierrick, Häuβler, Robert, Rau, Carsten, Carrere, Matthieu
• Primary Examiner(s): Dinh; Paul
• Application Number:
  US11/291,090
• Publication Number:
  US 20060143584A1
• Time in Patent Office: 1,119 Days
• Field of Search: 716 4- 6, 703/19
• US Class Current: 716/115
• CPC Class Codes: G06F 30/367 Design verification, e.g. using simulation, simulation program with integrated circuit emphasis [SPICE], direct methods or relaxation methods

Abstract

For analyzing the effects of crosstalk in an electronic device, a model description of the electronic device is provided which defines a victim net and at least one aggressor net, the model description allowing for simulating the dynamic response behaviour at an output of the victim net with respect to an input signal of the victim net and/or of the at least one aggressor net. A characteristic property of the response behaviour at the output of the victim net is represented as an output function of the simulation, the value of the output function depending on input parameters of the simulation. The output function is evaluated as to find an extremum of the output function in a preset range of the input parameters. The characteristic property may in particular be a measure of the delay of the output signal of the victim net with respect to the input signal of the victim net, the input parameters corresponding to the timing of a signal transition applied to the input of the at least one aggressor net with respect to the timing of a signal transition applied to the input of the victim net.

Claims

1. A method for analyzing crosstalk effects in an electronic device comprising:

a) providing a model description of the electronic device, the model description defining a victim net and at least one aggressor net capacitively coupled to the victim net, wherein the model description is configured for use in a simulation of the dynamic response behaviour at an output of the victim net with respect to an input signal of the victim net and/or of the at least one aggressor net, wherein the model description corresponds to a transistor-level description of the electronic device;

b) representing a characteristic property of the dynamic response behaviour as an output function of the simulation, the output function having a value depending on at least two input parameters of the simulation, wherein the input parameters comprise a timing of a transition of the input signal of the at least one aggressor net relative to a timing of a transition of the input signal of the victim net, and wherein the output function represents (i) a measure of noise induced in the output signal of the victim net, (ii) a measure of delay of the output signal of the victim net with respect to the input signal of the victim net, or (iii) a measure of the transition time of a signal transition observed at the output of the victim net; and

c) evaluating the output function so as to find an extremum of the output function in a preset range of the input parameters.

2. The method according to claim 1, wherein step c) further comprises using an optimization algorithm to evaluate the output function.

3. The method according to claim 2, wherein the optimization algorithm corresponds to a simplex-downhill algorithm.

4. The method according to claim 2, wherein step c) further comprises, prior to using the optimization algorithm, transforming the output function using a transformation which conserves the position of the extremum.

5. The method according to claim 1, further comprising:

including an input driver structure of the victim net into the simulation, and simulating the input signal of the victim net based on an input signal of the driver structure, the input signal of the driver structure corresponding to a signal transition having an idealized wave form parameterized by a number of parameters which form at least a part of the input parameters of the simulation.

6. The method according to claim 5, wherein the driver structure of the victim net includes a further victim net located upstream from the victim net.

7. The method according to claim 1, further comprising:

including a driver structure of the at least one aggressor net into the simulation, and simulating the input signal of the at least one aggressor net based on at least one input signal of the driver structure, the at least one input signal of the driver structure corresponding to a signal transition having an idealized wave form parameterized by a number of parameters, which form at least a part of the input parameters of the simulation.

8. The method according to claim 7, wherein the driver structure of the at least one aggressor net has multiple inputs and, for the simulation, only one of the inputs of the driver structure forms an active input which is subjected to the signal transition, the other inputs being subjected to a constant signal.

9. The method according to claim 8, wherein an edge direction of the signal transition applied to the active input is selected so as to obtain a signal transition at the input of the at least one aggressor net which is directed opposite to an edge direction of a signal transition applied to the input of the victim net.

10. The method according to claim 8, wherein an edge direction of the signal transition applied to the active input is selected so as to obtain a signal transition at the input of the at least one aggressor net which is directed in the same direction as the edge direction of a signal transition applied to the input of the victim net.

11. The method according to claim 8, further comprising selecting as the active input an input of the at least one aggressor net that has a signal transition with a smallest transition time.

12. The method according to claim 8, wherein the driver structure of the at least one aggressor net corresponds to a sequential circuit, and further comprising selecting as the active input the clock input of the sequential circuit.

13. The method according to claim 1, wherein an output structure of the victim net is included in the simulation.

14. The method according to claim 13, wherein the output structure of the victim net includes a further victim net located downstream from the victim net.

15. The method according to claim 1, further comprising:

d) performing a simulation of a further victim net in a signal path with the victim net, said simulation using at least one input parameter corresponding to the extremum found in step c); and

e) evaluating at least one characteristic descriptive of the output signal of the further victim net, depending on the values of the input parameters corresponding to the extremum of the output function.

16. The method according to claim 15, wherein the signal path comprises a sequence of more than two victim nets, and wherein steps d) and e) are repeated until the last victim net of the sequence has been evaluated.

17. The method according to claim 15, further comprising:

determining a total capacitance for a sequence of victim nets located downstream from the victim net that are not included in the simulation of step b); and

including the total capacitance into the simulation as a capacitive output load with respect to ground.

18. The method according to claim 15, further comprising combining values of the at least one descriptive parameter obtained for the victim set and the further victim set so as to obtain a corresponding parameter for the signal path.

19. The method according to claim 1, wherein a plurality of aggressor nets is defined and the method further comprises selectively including at least one of the aggressors net into the simulation, based on the value of the coupling capacitance of the respective aggressor net relative to the victim net.

20. The method according to claim 1, wherein the model description takes into account non-linear properties of transistors.

21. The method according to claim 1, wherein the model description is based on SPICE or HSPICE.

22. A device for analyzing crosstalk effect, comprising:

a processing device configured to

process descriptive data of an electronic device, the descriptive data defining a victim net and at least one aggressor net,

simulate a response behaviour at an output of the victim net with respect to an input signal of the victim net and/or of the at least one aggressor net,

represent a characteristic property of the response behaviour at an output of the victim net as an output function of the simulation, a value of the output function depending on at least two input parameters of the simulation, wherein the input parameters comprise a timing of a transition of the input signal of the at least one aggressor net relative to a timing of a transition of the input signal of the victim net, and wherein the output function represents (i) a measure of noise induced in the output signal of the victim net. (ii) a measure of delay of the output signal of the victim net with respect to the input signal of the victim net, or (iii) a measure of the transition time of a signal transition observed at the output of the victim net, and

evaluate the output function so as to find an extremum of the output function in a preset range of the input parameters.

23. A computer-readable medium containing instructions for analyzing crosstalk effects in an electronic device, by:

a) providing a model description of the electronic device, the model description defining a victim net and at least one aggressor net capacitively coupled to the victim net, wherein the model description is configured for use in a simulation of a dynamic response behaviour at an output of the victim net with respect to an input signal of the victim net and/or of the at least one aggressor net;

b) representing a characteristic property of the dynamic response behaviour as an output function of the simulation, the output function having a value depending on at least two input parameters of the simulation, wherein the input parameters comprise a timing of a transition of the input signal of the at least one aggressor net relative to a timing of a transition of the input signal of the victim net, and wherein the output function represents (i) a measure of noise induced in the output signal of the victim net, (ii) a measure of delay of the output signal of the victim net with respect to the input signal of the victim net, or (iii) a measure of the transition time of a signal transition observed at the output of the victim net; and

c) evaluating the output function so as to find an extremum of the output function in a preset range of the input parameters.