Signal Sampler
Libraries:
Mixed-Signal Blockset /
Utilities
Description
The Signal Sampler block estimates the value of an incoming fixed step discrete sampled signal at a specific time that is typically between two sample times. The block obtains this estimate using an accurate input value for the time and linear interpolation for the signal.
The Signal Sampler block calculates the time interval from the last sample to the exact time at which the clock transition occurred as the modular residue with respect to the sample interval. The block uses linear interpolation to calculate the new output sample value.
Ports
Input
signal — Fixed step discrete input signal
scalar
Fixed step discrete input signal to be sampled, specified as a scalar.
Data Types: single
| double
| int8
| int16
| int32
| uint8
| uint16
| uint32
| fixed point
clock — Saturated but sampled clock waveform
scalar
Saturated but sampled clock waveform, specified as a scalar. The input at the clock port, along with the input at the clock_time port, is used to define the time at which to sample the input signal.
Data Types: double
clock_time — Exact time of clock transition
scalar
Exact time of the clock transition, specified as a scalar. The input at the clock_time port, along with the input at the clock port, is used to define the time at which to sample the input signal.
DecisionThreshold — Voltage at which latched output switches polarity
scalar
The voltage at which latched output switches polarity, specified as a scalar.
Data Types: double
Output
sample — Sample output value at clock edge
scalar | -1
| -1
Sample output value at the clock edge, returned as a scalar.
The output has two modes:
Continuous — the output is exactly the value of the input signal at the time of the clock edge.
Latched — the output is binary, with values
-1
or1
.
Data Types: single
| double
| int8
| int16
| int32
| int64
| uint8
| uint16
| uint32
| uint64
| Boolean
| fixed point
Parameters
Clock edge — Determine when input signal is sampled
Rising
(default) | Falling
Determine when the input signal is sampled, either the rising or falling edge of the clock signal.
Programmatic Use
Block parameter:
ClockEdge |
Type: character vector |
Values:
Rising | Falling |
Default:
Rising |
Output mode — Determine output sample mode
Continuous
(default) | Latched
Determine the output sample mode, either Continuous
or
Latched
.
In Continuous
mode, the output is exactly the value of
the input signal at the time of the clock edge.
In Latched
mode, the output is binary, with values
-1
or 1
.
Programmatic Use
Block parameter:
OutputMode |
Type: character vector |
Values:
Continuous | Latched |
Default:
Continuous |
Simulate using — Select simulation mode
Code generation
(default) | Interpreted execution
Select the simulation mode. This choice affects the simulation performance.
Simulating the model using the Code generation
method
requires additional startup time, but the subsequent simulations run faster. Simulating
the model using the Interpreted execution
method may reduce
the startup time, but the subsequent simulations run slower. For more information, see
Interpreted Execution vs. Code Generation.
Programmatic Use
Block parameter:
SimulateUsing |
Type: character vector |
Values:
Code generation | Interpreted
execution |
Default:
Code generation |
DecisionThresholdPort — Turn on decision threshold port
on (default) | off
Select to turn on the decision threshold port. When turned on, the voltage at the DecisionThreshold port is used to decide when to switch polarity for latched output. By default, this option is selected.
Decision threshold is supported as an AMI parameter.
Programmatic Use
Block parameter:
DecisionThresholdPort |
Type: character vector |
Values: on| off |
Default: on |
Latch decision threshold — Voltage at which latched output switches polarity
0
(default) | scalar
The voltage at which latched output switches polarity, specified as a scalar. Use this parameter to define the decision threshold for latched output in the block itself.
Decision threshold is supported as an AMI parameter.
Dependencies
To enable this parameter, deselect the DecisionThresholdPort parameter.
Programmatic Use
Block parameter:
DecisionThreshold |
Type: character vector |
Values: scalar |
Default:
0 |
Latch sensitivity — Voltage above or below decision threshold needed to assure that latched output switches to correct polarity
0 (default) | scalar
The voltage above or below the decision threshold needed to assure that the latched output switches to the correct polarity. This parameter is used to model the metastable region of the latch. The behavior is modeled as the worst case, in which the latched output remains unchanged unless the sampled voltage is outside the metastable region. If the data sample voltage lies within the region (±Latch sensitivity), there is a 50% probability of bit error.
Latch sensitivity is supported as an AMI parameter.
Programmatic Use
Block parameter:
Sensitivity |
Type: character vector |
Values: scalar |
Default:
0 |
Symbol time (s) — Time of single symbol duration
100e-12
(default) | real positive scalar
Time of a single symbol duration, specified as a real positive scalar in seconds.
Programmatic Use
Block parameter:
SymbolTime |
Type: character vector |
Values: real positive scalar |
Default:
100e-12 |
Data Types: double
Sample interval (s) — Uniform time step of waveform
6.25e-12
(default) | real positive scalar
Uniform time step of the waveform, specified as a real positive scalar in seconds.
Programmatic Use
Block parameter:
SampleInterval |
Type: character vector |
Values: real positive scalar |
Default:
6.25e-12 |
Data Types: double
Modulation (2:NRZ, 3:PAM3, 4:PAM4) — Modulation scheme
2
(default) | 3
| 4
Number of logic levels in the modulation scheme:
Select
2
if the modulation scheme is NRZ(non-return to zero).Select
3
if the modulation scheme PAM3 (pulse amplitude modulation level 3).Select
4
if the modulation scheme PAM4 (pulse amplitude modulation level 4).
Programmatic Use
Block parameter:
Modulation |
Type: character vector |
Values:
2 .| 3 | 4 |
Default:
2 |
Data Types: char
Input waveform type — Type of input waveform
Sample
(default) | Impulse
Type of input waveform, either a sample by sample signal or an impulse response signal.
Programmatic Use
Block parameter:
WaveType |
Type: character vector |
Values:
Sample .| Impulse |
Default:
Sample |
Version History
Introduced in R2022a
See Also
Clock Generator | CDR (SerDes Toolbox)
Topics
- Clock and Data Recovery in SerDes System (SerDes Toolbox)
- Model Clock Recovery Loops in SerDes Toolbox (SerDes Toolbox)
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