Analog and Mixed-Signal Modeling Using the VHDL-AMS Language

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Additional resources for Analog and Mixed-Signal Modeling Using the VHDL-AMS Language [Presentation Slides, 36 Design Conference]

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Default for max_falling_slope is max_rising_slope, default for max_rising_slope is infinity. @8u…v†‡rÃF7hxhyh…Ã6H9rr’Ã@H‚†r…  968((ÃWC9G6HTÃUˆ‡‚…vhy VHDL AMS Outline ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ Introduction Brief Overview of VHDL-AMS Basic Concepts: DAEs Systems with Conservation Semantics: Diode Mixed Technology: Diode with Self Heating Piecewise Defined Behavior: Compressor,Voltage Limiter Procedural Modeling: Weighted Summer Signal-Flow Modeling: Adder-Integrator, Conversions Solvability: Voltage Source, Signal Flow Amplifier Initial Conditions: Capacitor Implicit Quantities Mixed-Signal Modeling: Comparators, D/A Converter VHDL-AMS Model Execution Discontinuities: SCR, Voltage Limiter, Bouncing Ball Time-Dependent Modeling: Sinusoid Voltage Source Frequency Domain Modeling: Current Source, Filter Noise Modeling: Resistor, Diode Conclusion @8u…v†‡rÃF7hxhyh…Ã6H9rr’Ã@H‚†r…  968((ÃWC9G6HTÃUˆ‡‚…vhy VHDL AMS Ideal Comparator VHDL-AMS Entity Declaration entity Comparator is generic (vthresh: REAL); -- threshold port (terminal ain, ref: electrical; signal dout: out BOOLEAN); end entity Comparator; ♦ Keyword signal is optional but indicates intent: • Interface terminals ain and ref • Interface signal dout @8u…v†‡rÃF7hxhyh…Ã6H9rr’Ã@H‚†r…  968((ÃWC9G6HTÃUˆ‡‚…vhy VHDL AMS Ideal Comparator VHDL-AMS Architecture Body architecture Ideal of Comparator is quantity vin across ain to ref; begin dout <= vin’above(vthresh); end architecture Ideal; ♦ Threshold crossing detected with Q’Above(E), a boolean signal that • is FALSE when the value of quantity Q is below threshold E • is TRUE when the value of quantity Q is above threshold E ♦ Q must be a scalar quantity, E must be an expression of the same type as Q ♦ An event occurs on signal Q’Above(E) at the exact time of the threshold crossing ♦ A process can be sensitive to Q’Above(E), since it is a signal @8u…v†‡rÃF7hxhyh…Ã6H9rr’Ã@H‚†r…  968((ÃWC9G6HTÃUˆ‡‚…vhy VHDL AMS Comparator with Hysteresis ♦ Conversion of electrical quantity to std_logic signal ♦ Hysteresis dout ‘1’ ‘X’ ‘0’ vin vlo vhi • dout becomes ‘X’ if vin stays in transition region for longer than the specified timeout @8u…v†‡rÃF7hxhyh…Ã6H9rr’Ã@H‚†r…  968((ÃWC9G6HTÃUˆ‡‚…vhy VHDL AMS Comparator with Hysteresis State Diagram one YLQ !

Time is limited by the specified slopes. Default for max_falling_slope is max_rising_slope, default for max_rising_slope is infinity. @8u…v†‡rÃF7hxhyh…Ã6H9rr’Ã@H‚†r…  968((ÃWC9G6HTÃUˆ‡‚…vhy VHDL AMS Outline ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ Introduction Brief Overview of VHDL-AMS Basic Concepts: DAEs Systems with Conservation Semantics: Diode Mixed Technology: Diode with Self Heating Piecewise Defined Behavior: Compressor,Voltage Limiter Procedural Modeling: Weighted Summer Signal-Flow Modeling: Adder-Integrator, Conversions Solvability: Voltage Source, Signal Flow Amplifier Initial Conditions: Capacitor Implicit Quantities Mixed-Signal Modeling: Comparators, D/A Converter VHDL-AMS Model Execution Discontinuities: SCR, Voltage Limiter, Bouncing Ball Time-Dependent Modeling: Sinusoid Voltage Source Frequency Domain Modeling: Current Source, Filter Noise Modeling: Resistor, Diode Conclusion @8u…v†‡rÃF7hxhyh…Ã6H9rr’Ã@H‚†r…  968((ÃWC9G6HTÃUˆ‡‚…vhy VHDL AMS Ideal Comparator VHDL-AMS Entity Declaration entity Comparator is generic (vthresh: REAL); -- threshold port (terminal ain, ref: electrical; signal dout: out BOOLEAN); end entity Comparator; ♦ Keyword signal is optional but indicates intent: • Interface terminals ain and ref • Interface signal dout @8u…v†‡rÃF7hxhyh…Ã6H9rr’Ã@H‚†r…  968((ÃWC9G6HTÃUˆ‡‚…vhy VHDL AMS Ideal Comparator VHDL-AMS Architecture Body architecture Ideal of Comparator is quantity vin across ain to ref; begin dout <= vin’above(vthresh); end architecture Ideal; ♦ Threshold crossing detected with Q’Above(E), a boolean signal that • is FALSE when the value of quantity Q is below threshold E • is TRUE when the value of quantity Q is above threshold E ♦ Q must be a scalar quantity, E must be an expression of the same type as Q ♦ An event occurs on signal Q’Above(E) at the exact time of the threshold crossing ♦ A process can be sensitive to Q’Above(E), since it is a signal @8u…v†‡rÃF7hxhyh…Ã6H9rr’Ã@H‚†r…  968((ÃWC9G6HTÃUˆ‡‚…vhy VHDL AMS Comparator with Hysteresis ♦ Conversion of electrical quantity to std_logic signal ♦ Hysteresis dout ‘1’ ‘X’ ‘0’ vin vlo vhi • dout becomes ‘X’ if vin stays in transition region for longer than the specified timeout @8u…v†‡rÃF7hxhyh…Ã6H9rr’Ã@H‚†r…  968((ÃWC9G6HTÃUˆ‡‚…vhy VHDL AMS Comparator with Hysteresis State Diagram one YLQ !

Default for max_falling_slope is max_rising_slope, default for max_rising_slope is infinity. ♦ Q’Delayed(T) • Quantity Q delayed by T (ideal delay, T >= 0) @8u…v†‡rÃF7hxhyh…Ã6H9rr’Ã@H‚†r…  968((ÃWC9G6HTÃUˆ‡‚…vhy VHDL AMS Implicit Quantities (2) ♦ Q’Ltf(num, den) • Laplace transfer function whose input is Q ♦ Q’ZOH(T, initial_delay) • A sampled version of quantity Q (zero-order hold) ♦ Q’Ztf(num, den, T, initial_delay) • Z-domain transfer function whose input is Q ♦ S’Ramp(tr, tf) • A quantity that follows signal S, but with specified rise and fall times.

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