                     # Analog Behavioral Modeling with the Verilog-A Language - PDF Free... Analog Behavioral Modeling with the Verilog-A Language - PDF Free...

Signal Assignment Statement • equals = (a == b) ? 6’b6 : 6’b5 • Assigns values to equals signal, possibly after a delay • (a == b) Compares all 9 bits of a with all 9 bits of b • Compare bitwise left to right • Big problem for you with = operator: • Assignment does not happen immediately! • Example: • z = 5 if (a == 6’b6) z = 6 // This doesn’t work • Does not mean the same thing as: • z = 5 if (a == 6’b6) z = 6 // This works Thomas: Digital Systems Design Lecture 6

## Analog Behavioral Modeling

HDL-A provides a mechanism for model characterization, verification, numerical robustness, stability, continuity and portability. The process must also reveal second-order effects and non-ideal behavior. Thus, language-based design within a complete design process will extend-but not replace-the traditional, bottom-up design cycle.

The earliest such analogy is due to James Clerk Maxwell who, in 6878, associated mechanical force with electrical voltage. This analogy became so widespread that sources of voltage are still today referred to as electromotive force. The power conjugate of voltage is electric current which, in the Maxwell analogy, maps to mechanical velocity. Electrical impedance is the ratio of voltage and current, so by analogy, mechanical impedance is the ratio of force and velocity. The concept of impedance can be extended to other domains, for instance in acoustics and fluid flow it is the ratio of pressure to rate of flow. In general, impedance is the ratio of an effort variable and the flow variable that results. For this reason, the Maxwell analogy is often referred to as the impedance analogy , although the concept of impedance was not conceived until 6886 by Oliver Heaviside , some time after Maxwell's death. 96 8 98

#### Asurvey of bottom-up behavioral modeling methods for analog circuits

For accessible sources regarding the behavioral approach, see 96 8 98 . 96 9 98

##### Analog Modeling with Verilog-A

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Parameter passing into sub-circuits also works with Analog Behavioral Modeling, making your models more flexible. Here is a small system that is a voltage follower with hysteresis, useful in simulating, say, a mechanical system with gear backlash:

How Does One Model Behavior? • Answer: Math Models! • Example – Gaussian Distribution • Example – Population Growth

The circuit introduced in Figure 8 is used here to check the compensation of the voltage drop and the ability of the model to generate a reverse current. In this section, we are interested to the qualitative aspect of the electrical quantities. So, the model must simulate accurately physical phenomena during the blocking state. In this section, the diode model depicted in Figure 8 was implemented in circuit simulation shown in Figure 9.

Square the signalSmall systems of behavioral models are easy to design using PSpice. For example, a true-RMS circuit can be built by decomposing the RMS function:

GCAP A B LAPLACE {V(A,B)} = {s}

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The authors present a behavioral representation for the class of Nyquist rate analog to digital (A/D) converters The behavioral model of analog IP is an abstract model of analog behavior. The more accurately the behavioral model represents analog behavior the slower its speed. Thus, to make it run faster...