Models continuous time linear equalizer (CTLE)
SerDes Toolbox / Datapath Blocks
The CTLE block applies a linear peaking filter to equalize the frequency response of a sample-by-sample input signal. The equalization process reduces distortions resulting from lossy channels. The filter is a real one-zero two-pole (1z/2p) filter, unless you define the gain-pole-zero (GPZ) matrix.
WaveIn
— Input baseband signalInput baseband signal. The input signal can be a sample-by-sample signal specified as a scalar, or an impulse response vector signal.
Data Types: double
WaveOut
— Equalized CTLE outputEqualized CTLE output waveform. If the input signal is a sample-by-sample signal specified as a scalar, then the output is also scalar. If the input signal is an impulse response vector signal, then the output is also a vector.
Data Types: double
Mode
— CTLE operating modeAdapt
(default) | Off
| Fixed
CTLE operating mode:
Off
— CTLE is bypassed and the input
waveform remains unchanged.
Fixed
— CTLE applies the CTLE transfer
function as specified by Configuration select to the input
waveform.
Adapt
— If the input signal is an impulse response vector
or a waveform vector, then the Init subsystem calls to the CTLE System object™. The CTLE System object determines the CTLE transfer function for the best eye height
opening and applies the transfer function to the input waveform for time domain
simulation. This optimized transfer function is used by the CTLE for entire time
domain simulation. For more information about the Init subsystem, see Statistical Analysis in SerDes Systems
If the input signal is a sample-by-sample scalar, then the CTLE
operates in the Fixed
mode.
Use get_param(gcb,'Mode')
to view the current CTLE
Mode.
Use set_param(gcb,'Mode',value)
to set CTLE to a specific
Mode.
Configuration select
— Select which member of transfer function to apply in fixed mode0
(default) | 1
| 2
| 3
| 4
| 5
| 6
| 7
| 8
Select which transfer function configuration to apply in CTLE fixed mode, specified as a real integer scalar. Depending on the Specification, Configuration select specifies which gain coefficient is applied to the filter transfer function.
For example, setting Configuration select to
n and Specification to 'DC Gain
and Peaking Gain'
selects the (n+1)-th element in the
DC gain (dB) and Peaking gain (dB) vectors
to be applied to the filter transfer function.
If CTLE Mode is set to Adapt
and the
input is an impulse response vector or a waveform vector, Configuration
select is automatically calculated to determine the best eye height
opening. To view the value of the Configuration select parameter,
choose Add Plots > Report in the SerDes Designer
app.
Use get_param(gcb,'ConfigSelect')
to view the current
value of Configuration Select.
Use set_param(gcb,'ConfigSelect',value)
to set
Configuration Select to a specific value.
Data Types: double
Specification
— Input specification for CTLE response'DC Gain and Peaking Gain'
(default) | 'DC Gain and AC Gain'
| 'AC Gain and Peaking Gain'
| 'GPZ Matrix'
Defines which inputs will be used for the CTLE transfer function family. There are five inputs which can be used to define the CTLE transfer function family: DC gain (dB), Peaking gain (dB), AC gain (dB), Peaking frequency (Hz), and Gain pole zero matrix.
You can define the CTLE response from any two of the three gains and peaking frequency or you can define the GPZ matrix for the CTLE.
Select 'DC Gain and Peaking Gain'
to specify CTLE response
from DC gain (dB), Peaking gain (dB),
and Peaking frequency (Hz).
Select 'DC Gain and AC Gain'
to specify CTLE response is
from DC gain (dB), AC gain (dB), and
Peaking frequency (Hz).
Select 'AC Gain and Peaking Gain'
to specify CTLE response
from AC gain (dB), Peaking gain (dB),
and Peaking frequency (Hz).
Select 'GPZ Matrix'
to specify CTLE response is from
Gain pole zero matrix.
Use get_param(gcb,'Specification')
to view the current
CTLE Specification.
Use set_param(gcb,'Specification',value)
to set CTLE to a
specific Specification.
Data Types: char
DC gain (dB)
— Gain at zero frequency[0:-1:-8]
(default) | scalar | vectorGain at zero frequency for the CTLE transfer function, specified as a scalar or a vector in dB. If specified as a scalar, it is converted to match the length of Peaking gain (dB), AC gain (dB), and Peaking frequency (Hz) by scalar expansion. If specified as a vector, the vector length must be the same as the vectors in Peaking gain (dB), AC gain (dB), and Peaking frequency (Hz).
This parameter is only available when Specification is set to
'DC Gain and Peaking Gain'
or 'DC Gain and
AC Gain'
.
Use get_param(gcb,'DCGain')
to view the current value of
DC gain (dB).
Use set_param(gcb,'DCGain',value)
to set DC
gain (dB) to a specific value.
Data Types: double
Peaking gain (dB)
— Difference between AC and DC gain[0:8]
(default) | scalar | vectorPeaking gain, specified as a scalar or vector in dB. Peaking gain (dB) is the difference between AC gain (dB) and DC gain (dB) for the CTLE transfer function. If specified as a scalar, it is converted to match the length of DC gain (dB), AC gain (dB), and Peaking frequency (Hz) by scalar expansion. If specified as a vector, the vector length must be the same as the vectors in DC gain (dB), AC gain (dB), and Peaking frequency (Hz).
This parameter is only available when Specification is set to
'DC Gain and Peaking Gain'
or 'AC Gain and
Peaking Gain'
.
Use get_param(gcb,'PeakingGain')
to view the current
value of Peaking gain (dB).
Use set_param(gcb,'PeakingGain',value)
to set
Peaking gain (dB) to a specific value.
Data Types: double
AC gain (dB)
— Gain at peaking frequency0
(default) | scalar | vectorGain at the peaking frequency for the CTLE transfer function, specified as a scalar or vector in dB. If specified as a scalar, it is converted to match the length of DC gain (dB), Peaking gain (dB), and Peaking frequency (Hz) by scalar expansion. If specified as a vector, the vector length be the same as the vectors in DC gain (dB), Peaking gain (dB), and Peaking frequency (Hz).
This parameter is only available when Specification is set to
'DC Gain and AC Gain'
or 'AC Gain and
Peaking Gain'
.
Use get_param(gcb,'ACGain')
to view the current value of
AC gain (dB).
Use set_param(gcb,'ACGain',value)
to set AC
gain (dB) to a specific value.
Data Types: double
Peaking frequency (Hz)
— Approximate frequency at which CTLE transfer function peaks5e9
(default) | scalar | vectorApproximate frequency at which CTLE transfer function peaks in magnitude, specified as a scalar or a vector in GHz. If specified as a scalar, it is converted to match the length of DC gain (dB), AC gain (dB), and Peaking gain (dB) by scalar expansion. If specified as a vector, the vector length must be the same as the vectors in DC gain (dB), AC gain (dB), and Peaking gain (dB).
This parameter is not available when Specification is set to
'GPZ Matrix'
.
Use get_param(gcb,'PeakingFrequency')
to view the current
value of Peaking frequency (Hz).
Use set_param(gcb,'PeakingFrequency',value)
to set
Peaking frequency (Hz) to a specific value.
Data Types: double
Gain pole zero matrix
— Gain pole zeroGain pole zero, specified as a matrix. Gain pole zero matrix explicitly defines the family of CTLE transfer functions by specifying the DC gain (dB) (dB) in the first column and then poles and zeros in alternating columns. The poles and zeros are specified in Hz. Additional rows in the matrix define additional configurations, which can be selected using the Configuration Select parameter.
No repeated poles or zeros are allowed. Complex poles or zeros must have conjugates. The number of poles must be greater than number of zeros for system stability. Poles and zeros of 0 Hz is ignored and can be used to zero-pad the matrix.
Example: To create a gain pole zero matrix with three poles and two zeroes, input the matrix as follows: [G, P1, Z1, P2, Z2, P3].
This parameter is only available when Specification is set to
'GPZ Matrix'
.
Use get_param(gcb,'GPZ')
to view the current value of
Gain pole zero matrix.
Use set_param(gcb,'GPZ',value)
to set Gain pole
zero matrix to a specific value.
Data Types: double
Complex Number Support: Yes
Visualize Response
— Plot CTLE responseClick to plot the CTLE response. The resulting plot shows CTLE transfer function family curves for different CTLE configurations.
Mode
— Include Mode parameter in IBIS-AMI modelSelect to include Mode as a parameter in the IBIS-AMI file. If you deselect Mode, it is removed from the AMI files, effectively hard-coding Mode to its current value.
Configuration select
— Include Configuration select parameter in IBIS-AMI modelSelect to include Configuration select as a parameter in the IBIS-AMI file. If you deselect Configuration select, it is removed from the AMI files, effectively hard-coding Configuration select to its current value.
AGC | DFECDR | SaturatingAmplifier | serdes.AGC
| serdes.CTLE
| serdes.DFECDR
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