Simulink Models of PLLs and Data Converters
R2026bUse the measurement blocks to analyze performance metrics such as phase noise, reference and fractional spurs, aperture jitter, timing impairments, and lock time in PLL systems in Simulink. You can also measure aperture jitter, SNR, SINAD, noise floor, offset error, and gain error in data converters. Use block-specific testbenches to validate your customized blocks.
To analyze PLLs and data converters in MATLAB®, see MATLAB Analysis of PLLs and Data Converters.
Blocks
 | Lock Time Measurement | Measure time a PLL takes to reach target frequency within given tolerance |
 | Phase Noise Measurement | Compute phase noise at specific frequency offset vectors |
 | PFD and Charge Pump Testbench | Generic test environment for phase/frequency detectors and charge pumps |
 | VCO Testbench | Validate voltage controlled oscillator (VCO) by measuring phase noise metrics or VCO characteristics |
 | PLL Testbench | Validate PLL system by measuring operating frequency, lock time, and phase noise |
 | ADC AC Measurement | Measure AC performance metrics of ADC output |
 | ADC DC Measurement | Measure DC performance metrics of ADC output |
 | ADC Testbench | Measures DC and AC performance metrics of ADC output |
 | DAC DC Measurement | Measure DC performance metrics of DAC output |
 | DAC AC Measurement | Measure AC performance metrics of DAC output |
 | DAC Testbench | Measure DC and AC performance metrics of DAC output |
Topics
- Compute Phase Noise Measurements Using Spectrum Analyzer
Learn how to obtain phase noise measurements of signals using the Spectrum Analyzer block.
Featured Examples
50x PLL Frequency Synthesizer Behavior Study and Measurements
Different measurements and scopes available to study the behavior of a PLL (phase-locked loop). In this example, the 1 MHz reference frequency of the PLL is multiplied by an integer (50).This drives to VCO output to 50 MHz.
PLL With Dual Modulus Prescaler
How a PLL (phased locked loop) model works with a dual modulus prescaler frequency divider.
Measuring Offset and Gain Errors in ADC
How offset error and gain error are calculated and how each affects the transfer curve of an ADC. Offset error and gain error characterize part of the linearity error in an ADC.
ADC Linearity Measurement Using Histogram
Statistical measurement of ADC Linearity is popular in physical systems due to its noise tolerance and relative simplicity of implementation in a physical environment. This example covers problems inherent to statistical linearity measurements and some possible solutions for implementing these measurements in Simulink®.
Third Order Delta Sigma ADC
Model a 3rd order Delta Sigma ADC and measure its performance using the ADC AC Measurement block. This ADC model consists of a behavioral model of a delta sigma ADC that uses a 3rd order feedforward modulator. The ADC input sample rate is 64 MHz and after decimating filters, the output sample rate is 1 MHz.
AC Metrics of Fourth Order Delta Sigma ADC
Model a fourth order delta sigma ADC and measure its AC metrics. The ADC AC Measurement block from the Mixed-Signal Blockset™ is used to measure the AC performance of the ADC. AC measurements are essential to measure the metrics like SNR and ENOB inform the designer whether optimal performance is being achieved by the design. If not, the designer can tweak the design parameters to make the better.
