Verilog-AMS Library

This repository contains a collection of Verilog-AMS models for various electronic components and systems. The models are designed for use in circuit simulation tools that support the Verilog-AMS language.

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Module Overview

1. amp_dynamic

• Function: Dynamic amplifier with clocked operation and reset. Amplifies the differential input on clock edge, then holds output.
• Inputs:
  • clk: Clock input (starts amplification on rising edge)
  • rst: Reset input (active high)
  • inp, inm: Differential analog inputs
• Outputs:
  • done: Indicates amplification complete
  • outp, outm: Differential analog outputs
• Parameters:
  • tamp: Amplification time (default: 10u)
  • gain: Amplifier gain (default: 8)
  • vcm: Common mode output voltage (default: 2.5)
  • offset: Input-referred offset voltage (default: 0)
  • vlogic_high: Logic high voltage (default: 5)
  • vtrans: Clock threshold voltage (default: 2.5)
  • tdel: Output delay (default: 3u)
  • trise, tfall: Output rise/fall times (default: 1u)

2. dff_rsn

• Function: D flip-flop with asynchronous reset and set.
• Inputs:
  • clk: Clock input
  • d: Data input
  • _rst: Asynchronous reset (active low)
  • _set: Asynchronous set (active low)
• Outputs:
  • q: Output
  • _q: Complementary output
• Parameters:
  • vlogic_high: Logic high voltage (default: 5)
  • vlogic_low: Logic low voltage (default: 0)
  • vtrans_clk: Clock threshold voltage (default: 2.5)
  • vtrans: Data/reset/set threshold voltage (default: 2.5)
  • tdel: Output delay (default: 3u)
  • trise, tfall: Output rise/fall times (default: 1u)

3. comparator_dynamic

• Function: Dynamic comparator. Compares differential input on clock edge, outputs logic high/low accordingly, and resets on clock fall.
• Inputs:
  • clk: Clock input (triggers comparison on rising edge, reset on falling edge)
  • inp, inm: Differential analog inputs
• Outputs:
  • outp, outm: Differential digital outputs
    • Note: Both outputs are logic high during reset (after clock falling edge).
• Parameters:
  • offset: Input-referred offset voltage (default: 0)
  • vlogic_high: Logic high voltage (default: 5)
  • vlogic_low: Logic low voltage (default: 0)
  • vtrans_clk: Clock threshold voltage (default: 2.5)
  • tdel: Output delay (default: 3u)
  • trise, tfall: Output rise/fall times (default: 1u)

4. tah_ideal

• Function: Ideal track-and-hold circuit. Tracks input when clock is high, holds output when clock is low.
• Inputs:
  • clk: Clock input (track when high, hold when low)
  • in: Analog input
• Inout:
  • out: Analog output (bidirectional for charge sharing)
• Parameters:
  • ron: On-resistance during track mode (default: 25)
  • vtrans_clk: Clock threshold voltage (default: 2.5)

5. adc_16bit_ideal

• Function: Ideal 16-bit analog-to-digital converter. Converts analog input to 16-bit digital output on clock edge.
• Inputs:
  • in: Analog input
  • clk: Clock input (conversion on rising edge)
• Outputs:
  • out[15:0]: 16-bit digital output bus
• Parameters:
  • vref: Reference voltage for full-scale input (default: 1.0)
  • vlogic_high: Logic high voltage (default: 5)
  • vlogic_low: Logic low voltage (default: 0)
  • vtrans_clk: Clock threshold voltage (default: 2.5)
  • tdel: Output delay (default: 3u)
  • trise, tfall: Output rise/fall times (default: 1u)

6. dac_16bit_ideal

• Function: Ideal 16-bit digital-to-analog converter. Converts 16-bit digital input to analog output.
• Inputs:
  • in[15:0]: 16-bit digital input bus
• Outputs:
  • out: Analog output
• Parameters:
  • vref: Reference voltage for full-scale output (default: 1)
  • vtrans: Input threshold voltage (default: 2.5)
  • tdel: Output delay (default: 3u)
  • trise, tfall: Output rise/fall times (default: 1u)

7. ohmmeter

• Function: Measures resistance and conductance of a device under test (DUT). The DUT should be connected as follows:
  • Connect the DUT's positive terminal to dutp
  • Break the connection between the DUT's negative terminal and the rest of the circuit
  • Connect the DUT's negative terminal to iprobe
  • Connect the rest of the circuit to dutm
• Inputs:
  • dutp, iprobe: DUT voltage and current probe
• Outputs:
  • dutm: DUT negative terminal
  • r: Measured resistance output
  • g: Measured conductance output
• Parameters:
  • max_resistance: Maximum reported resistance (default: 1k)
  • min_resistance: Minimum reported resistance (default: -1)
  • max_conductance: Maximum reported conductance (default: 1)
  • min_conductance: Minimum reported conductance (default: -1)

8. pfd

• Function: Phase-frequency detector. Detects phase and frequency difference between two clock signals.
• Inputs:
  • ref: Reference clock input
  • fb: Feedback clock input
• Outputs:
  • up: Output pulse when ref leads fb
  • down: Output pulse when fb leads ref
• Parameters:
  • vlogic_high: Logic high voltage (default: 5)
  • vtrans: Input threshold voltage (default: 2.5)
  • tdel: Output delay (default: 3u)
  • trise, tfall: Output rise/fall times (default: 1u)

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License

This mod is under MIT LICENSE.