Z-Parameters Mixer

Model mixer and local oscillator using Z-parameters

• Library:
• RF Blockset / Equivalent Baseband / Mixers

Description

The Z-Parameters Mixer block models the nonlinear mixer described in the block dialog box in terms of its frequency-dependent Z-parameters, the frequencies of the Z-parameters, noise data (including phase noise data), and nonlinearity data.

Parameters

expand all

Main

Z-parameters for the nonlinear mixer, specified as a 2-by-2-by-M array where M is the number of Z-parameters.

Frequency of the Z-parameters, specified as an M-element vector with each element unit in hertz. All frequencies must be positive.

Method to interpolate the network parameters, specified as one of the following:

MethodDescription
`Linear`Linear interpolation
`Spline`Cubic spline interpolation
`Cubic`Piecewise cubic Hermite interpolation

Type of mixer, specified as `Downconverter` or `Upconverter`.

Local oscillator frequency, specified as an M-element vector with each element unit in hertz.

• If you choose Mixer Type as `Downconverter`, then the blockset computes the mixer output frequency, fout, from the mixer input frequency, fin, and the local oscillator frequency, flo, as fout = finflo.

• If you Mixer Type as `Upconverter`, then fout = fin + flo.

Note

For a downconverting mixer, the local oscillator frequency must satisfy the condition finflo ≥ 1/(2ts), where ts is the sample time specified in the Input Port block. Otherwise, an error appears.

Noise Data

Phase noise frequency offset, specified as a numeric vector with units in hertz.

Data Types: `double`

Phase noise level, specified as a numeric vector with units in decibels relative to the carrier per hertz.

Data Types: `double`

Type of noise data, specified as one of the following:

• `Noise figure`

• `Spot noise data`

• `Noise factor`

• `Noise temperature`

This parameter is disabled if the data source contains noise data.

Available signal-to-noise ratio at the input to available signal-to-noise ratio at the output, specified as a scalar ratio or a vector of ratios.

Dependencies

To enable this parameter, select `Noise figure` in Noise type.

Minimum ratio of available signal-to-noise ratio at the input to available signal-to-noise ratio at the output, specified as a scalar ratio or a vector of ratios.

Dependencies

To enable this parameter, select `Spot noise data` in Noise type.

Optimal source impedance, specified as a complex scalar or a complex vector.

Dependencies

To enable this parameter, select `Spot noise data` in Noise type.

Normalized resistance values used to take noise measurement, specified as a positive scalar or a positive vector.

Dependencies

To enable this parameter, select `Spot noise data` in Noise type.

Ratio of available signal-to-noise power at the input to available signal-to-noise power at the output, specified as a scalar ratio or a vector of ratios.

Dependencies

To enable this parameter, select `Noise factor` in Noise type.

Equivalent temperature that produces the same amount of noise as the mixer, specified as a nonnegative scalar or nonnegative vector with units in kelvins.

Dependencies

To enable this parameter, select `Noise temperature` in Noise type.

Nonlinearity Data

Type of third order intercept, specified as `OIP3` (output intercept point) or `IIP3` (input intercept point). This parameter is disabled if the data source contains power data or IP3 data.

IP3 value, specified as a scalar in dBm for frequency independent nonlinear data or a vector with each element unit in dBm for frequency dependent nonlinear data. This parameter is disabled if the data source contains power data or IP3 data.

Output power value (${P}_{1dB,out}$) at which the gain has decreased by 1 dB, specified as a scalar in dBm for frequency independent nonlinear data or vector with each element unit in dBm for frequency dependent nonlinear data. This parameter is disabled if the data source contains power data or IP3 data.

Output power value (${P}_{sat,out}$) that the mixer produces when fully saturated, specified as a scalar in dBm for frequency independent nonlinear data or a vector with each element unit in dBm for frequency dependent nonlinear data. This parameter is disabled if the data source contains output saturation power data.

Decrease in gain value ($G{C}_{sat}$) when the power is fully saturated, specified as a scalar in dB for frequency independent nonlinear data or a vector with each element unit in dB for frequency dependent nonlinear data.

Visualization

Frequency data source, specified as ```Same as the Z-Parameters``` or `User-specified`.

Frequency data range, specified as a vector with each element unit in hertz.

Dependencies

To enable this parameter, set Source of frequency data to `User specified`.

Reference impedance, specified as a nonnegative scalar in ohms.

Type of data plot to visualize using the given data, specified as one of the following:

• `X-Y plane` — Generate a Cartesian plot of the data versus frequency. To create linear, semilog, or log-log plots, set the Y-axis scale and X-axis scale accordingly.

• `Composite data` — Plot the composite data. For more information, see Create Plots.

• `Polar plane` — Generate a polar plot of the data. The block plots only the range of data corresponding to the specified frequencies.

• `Z smith chart`, ```Y smith chart```, and `ZY smith chart` — Generate a Smith® chart. The block plots only the range of data corresponding to the specified frequencies.

Type of parameters to plot based on the Plot type you set, specified as one of the following.

Plot typeY parameter1
`X-Y plane``S11`, `S12`, `S21`, `S22`, `GroupDelay`, `OIP3`, `NF`, `NFactor`, `NTemp`, and `PhaseNoise`.
`Composite data`No Y parameter1 to set.
`Polar plane``S11`, `S12`, `S21`, and `S22`
`Z Smith chart``S11` and `S22`.
`Y Smith chart``S11` and `S22`.
`ZY smith chart``S11` and `S22`.

Type of parameters to plot based on the Plot type you set, specified as one of the following.

Plot typeY parameter1
`X-Y plane``S11`, `S12`, `S21`, `S22`, `GroupDelay`, `OIP3`, `NF`, `NFactor`, `NTemp`, and `PhaseNoise`.
`Composite data`No Y parameter1 to set.
`Polar plane``S11`, `S12`, `S21`, and `S22`
`Z Smith chart``S11` and `S22`.
`Y Smith chart``S11` and `S22`.
`ZY smith chart``S11` and `S22`.

Plot format, specified as one of the following.

Y parameter1Y format1
`S11`, `S12`, `S21`, and `S22`.`Magnitude (decibels)`, `Magnitude (linear)`, `Angle(degrees)`, `Angle(radians)`, `Real`, and `Imaginary`.
`GroupDelay``ns`, `us`, `ms`, `s`, and `ps`.
`OIP3``dB`, `dBm`, `W`, and `mW`.
`NF``Magnitude (decibels)`
`NFactor``None`
`NTemp``Kelvin`
`PhaseNoise``dBc/Hz`

Dependencies

To enable Y format1, set Plot type to `X-Y plane`.

Plot format, specified as one of the following.

Y parameter1Y format1
`S11`, `S12`, `S21`, and `S22`.`Magnitude (decibels)`, `Magnitude (linear)`, `Angle(degrees)`, `Angle(radians)`, `Real`, and `Imaginary`.
`GroupDelay``ns`, `us`, `ms`, `s`, and `ps`.
`OIP3``dB`, `dBm`, `W`, and `mW`.
`NF``Magnitude (decibels)`
`NFactor``None`
`NTemp``Kelvin`
`PhaseNoise``dBc/Hz`

Dependencies

To enable Y format1, set Plot type to `X-Y plane`.

Frequency plot, specified as `Freq`.

Frequency plot format, specified as one of the following.

 `Auto` `Hz` `kHz` `MHz` `GHz` `THz`

Y-axis scale, specified as `Linear` or `Log`.

Dependencies

To enable this parameter, set Plot type to ```X-Y plane```.

X-axis scale, specified as `Linear` or `Log`.

Dependencies

To enable this parameter, set Plot type to ```X-Y plane```.

Plot specified data using the plot button.