Granted Patent B2

US 8,826,205 · App. 13/965,201 · Granted Sep 2, 2014

Abstract

Claims (21)

1. A method of producing a verified design of a digital to analog converter (DAC), wherein the DAC converts a digital input signal to an analog output signal, the method comprising:

providing a hardware description language (HDL) representation of the DAC;

using a simulator for simulating numerical values of the analog output signal as a function of said representation of said DAC for a range of numerical values of the digital input signal and generating simulated numerical values of the analog output signal;

using a model for converting the simulated numerical values of the analog output signal to numerical values of an equivalent model output signal in a same digital format as the digital input signal, wherein said converting is performed by a computer system; and

comparing the numerical values of the digital input signal and the model output signal and detecting numerical value differences greater than a defined tolerance, wherein said comparing and detecting are performed by the computer system.

2. The method of claim 1 , wherein said HDL representation is in Verilog-AMS language.

3. The method of claim 2 , wherein said simulating, said model and said comparing are a non-synthesis part of a system Verilog checker.

4. The method of claim 2 , wherein parameters of said simulator relating to digital signal width, reference voltage and accuracy of said converter are configured by a user.

5. The method of claim 1 , wherein said model is an analog-to-digital converter (ADC).

6. The method of claim 5 , wherein said comparing compares a difference at a defined time between the numerical value of the model output signal and the numerical value of the digital input signal with said defined tolerance.

7. The method of claim 6 , wherein said defined time is a time relative to a change in the numerical value of the digital input signal.

8. A non-transitory machine-readable medium containing instructions executable by a computer system, wherein the instructions operate on a hardware description language (HDL) representation of a digital to analog converter (DAC) for converting a digital input signal to an analog output signal, wherein the instructions perform the steps of:

simulating numerical values of the analog output signal as a function of the HDL representation of the DAC for a range of numerical values of the digital input signal and generating simulated numerical values of the analog output signal;

converting the simulated numerical values to numerical values of an equivalent model output signal having a same format as the digital input signal; and

comparing the numerical values of the input signal and the model output signal, and determining differences greater than a defined tolerance.

9. The non-transitory machine-readable medium of claim 8 , wherein said HDL representation is in Verilog-AMS language.

10. The non-transitory machine-readable medium of claim 9 , wherein the simulating, the converting, and the comparing are performed by a non-synthesis part of a system Verilog checker.

11. The non-transitory machine-readable medium of claim 9 , wherein parameters of the simulating relating to digital signal width, reference voltage and accuracy of said DAC are user-configurable.

12. The non-transitory machine-readable medium of claim 8 , wherein an analog-to-digital converter (ADC) is used to convert the simulated numerical values to the numerical values of the equivalent model output signal.

13. The non-transitory machine-readable medium of claim 12 , wherein the comparator compares a difference at a defined time between the numerical value of the model output signal and the numerical value of the input signal in digital format with said defined tolerance.

14. The non-transitory machine-readable medium of claim 13 , wherein said defined time is a time relative to a change in the numerical value of the input signal.

Assignments (26)