Mix Analog and Digital Signals

Combine analog circuit behaviors with digital models to create more detailed representations of electronic systems

In electronic systems that combine analog processing with logic gates, several parameters are essential to the overall behavior of the system. These parameters include the finite slew rate of circuit output signals, the propagation delay of signals, and the exact decision threshold of circuit inputs. Add blocks to your model to include these effects in time domain simulations of the system.

Blocks

Linear Circuit Wizard	Generate or modify linear circuit
Slew Rate	Model amplitude, rise and fall times, and propagation delay of logic gates
Logic Decision	Threshold crossing detector at input to binary process
Operational Amplifier	Model operational amplifier with two or more poles
Variable Pulse Delay	Delay samples by controlled, continuously variable amount
Lowpass Resampler	Convert signal from one sample time to another
Binary Vector Conversion	Convert scalar integer to binary logic vector and vice versa
Clock Generator	Generate clock signal with one or more phases
Signal Sampler	Sample incoming signal at the edge of incoming clock

Functions

`lowpassResample`	Convert signal from one sample time to another
`tr0Reader`	Converts transient analysis simulation results from Synopsys to CSV file or MATLAB table

Topics

Model Linear Circuit Response from SPICE Netlist
Model the response of a linear circuit described by a SPICE netlist.
Ports Supported in Linear Circuit Wizard
Review and modify the ports of a linear circuit before generating a block to model it.
Define Device Noise Using Linear Circuit Wizard
You can use the Linear Circuit Wizard block to model the device noise generated by a linear circuit.
MATLAB Systems Generated from Linear Circuit Wizard
You can use a single Linear Circuit Wizard block to configure one or more MATLAB System blocks.
Analyze Clock Buffer Using Mixed Signal Analyzer
This example shows how you can use the Mixed Signal Analyzer app to analyze a clock buffer circuit and understand the effect of varying corner points using trend charts.
LDO Circuit Analysis Using Mixed-Signal Analyzer
This example shows you how to use the ‘Trend Chart’ plotting capability and ‘Update’ workflow feature of Mixed Signal Analyzer (MSA) app, in analyzing a Low Drop-Out (LDO) voltage regulator circuit.
Design Inverting Amplifier
This example shows how to model an inverting amplifier circuit using the Operational Amplifier block and the Linear Circuit wizard block.

Featured Examples

Logic Timing Simulation

Use the Variable Pulse Delay block to create accurate timing models of logic circuits.

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Digital Timing Using Fixed Step Sampling

Model a three-stage ring oscillator using a combination of fixed step and variable step discrete sample times.

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Digital Timing Using Solutions to Ordinary Differential Equations

Model a three stage ring oscillator using models defined by ordinary differential equations (ODE).

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Circuit Design Details Affect PLL Performance

Use the Linear Circuit Wizard block to evaluate the effect of loop filter circuit design details on the performance of a phase-locked loop.

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Analyze T-Coil Circuit

Use the Linear Circuit Wizard block to analyze a T-coil impedance matching circuit and generate S-parameter data from the result.

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Feedback Amplifier Design for Voltage-Mode Boost Converter

Tune the components of a power supply controller to control the output voltage of a boost converter using loop-shape design and fixed-structure tuning methods. This workflow is demonstrated using a boost converter model and a type-III controller.

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Boost Power Train Operating Point Analysis

Analyze the operating point of a power train for a boost switched mode power supply (SMPS) using the Linear Circuit Wizard from the Mixed-Signal Blockset.

Model Comparator with Hysteresis Using Operational Amplifier

Model an analog comparator with hysteresis using the Operational Amplifier block from Mixed-Signal Blockset.

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Generate VerilogA Model of CTLE Using Custom Function in MSA

Write custom analysis function in Mixed-Signal Analyzer (MSA) app to fit the transfer function of a CTLE circuit to a rational function and generate a VerilogA model that can be simulated in Cadence.

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