Models continuous time linear equalizer (CTLE)

**Library:**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.

`WaveIn`

— Input baseband signalscalar | vector

Input 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 outputscalar | vector

Equalized 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 mode`Adapt`

(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 inside the CTLE determines the CTLE transfer function for the best eye height opening and applies the transfer function to the input waveform. This optimized transfer function is used by the CTLE for entire time domain simulation.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 mode`0`

(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:

`'DC Gain and Peaking Gain'`

— CTLE response is specified from**DC gain (dB)**,**Peaking gain (dB)**, and**Peaking frequency (Hz)**.`'DC Gain and AC Gain'`

— CTLE response is specified from**DC gain (dB)**,**AC gain (dB)**, and**Peaking frequency (Hz)**.`'AC Gain and Peaking Gain'`

— CTLE response is specified from**AC gain (dB)**,**Peaking gain (dB)**, and**Peaking frequency (Hz)**.`'GPZ Matrix'`

— CTLE response is specified 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 frequency`0`

(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 peaks`5e9`

(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 zeromatrix

Gain 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 column 1 and then poles and zeros in alternating columns.
The poles and zeros are specified in Hz.

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.

**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`

`IBIS-AMI parameters`

— Parameters included in IBIS-AMI model`Mode`

| `Config select`

Choose which parameters to include in IBIS-AMI models. By default, both parameters are selected.

If you deselect a parameter, the parameter is removed from the AMI files,
hard-coding the parameter to its current value. For example, if
**Mode** is set to `Adapt`

and you clear the
check box for **Mode** under **IBIS-AMI parameters**,
**Mode** is hard-coded to `Adapt`

.

AGC | DFECDR | SaturatingAmplifier | `serdes.AGC`

| `serdes.CTLE`

| serdes.DFECDR

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