Signal integrity simulation method for encryption hybrid model

1. A signal integrity simulation method for an encryption hybrid model, comprising:

extracting a step response data of a SPICE model through a transient simulation;

generating an external random code signal;

importing the extracted step response data as an input source of an ADS channel simulator; and

calculating, by the ADS channel simulator, an eye diagram at a RX end based on an algorithm and the external random code signal, to perform measurement on the eye diagram,

wherein

a verification link is formed before performing the transient simulation, and the verification link is formed by connecting a TX end to the RX end via a wiring model, and wherein

a chip at the TX end is a SPICE model that is encrypted, and a step response generated by the chip at the TX end comprises all characteristics of the chip at the TX end, and a chip at the RX end is an IBIS AMI model, and the SPICE model at the TX end is a RC circuit.

2. The signal integrity simulation method for an encryption hybrid model according to claim 1 , wherein in a case that the SPICE model at the TX end is not encrypted, the simulation method comprises the following steps of:

1) importing the SPICE model based on a Spice Wizard function of ADS, wherein the SPICE model at the TX end that is not encrypted is capable of being directly called by the ADS; and reserving an input interface for the SPICE model, to input a step signal outside the SPICE model;

2) establishing a link model;

3) performing a transient step response simulation, wherein the imported SPICE model is connected to a wiring model, and a resistor of 50 ohm is joined at an end of the verification link; inputting an ideal step signal at the input interface reserved for the SPICE model, wherein a simulation time is set to make an output of the step response be in a steady state, and a simulation time interval is set to guarantee calculation accuracy; and extracting the step response data at a position where the resistor is joined, wherein the step response data comprises the characteristics of the chip at the TX end and the verification link;

4) performing a channel simulation, wherein the step response data obtained in step 3) is imported into the channel simulation as a signal source at the RX end, and the external random code signal is inputted, and parameters related to the channel simulation are set; and

5) verifying simulation results, wherein a channel simulation result obtained in step 4) is compared with a transient simulation result, to verify consistency between the channel simulation result and the transient simulation result.

3. The signal integrity simulation method for an encryption hybrid model according to claim 1 , wherein in a case that the SPICE model at the TX end is encrypted, the simulation method comprises the following steps of:

1) performing a transient simulation based on HSPICE, wherein a transient step response simulation is performed on the encrypted SPICE model and the verification link to obtain a step response output file with a suffix of .lis; and editing a format of the step response output file to form a file with a suffix of .tim that is capable of being called by ADS;

2) performing an active simulation, wherein the step response data (.tim) is imported into the ADS for the active simulation, and wherein the active simulation is performed by calling the step response data in the ADS based on the external random code signal; and

3) verifying simulation results, wherein a transient simulation result is compared with an active simulation result obtained in step 2) to verify consistency between the transient simulation result and the active simulation result.