Analyzing Circuits Using RF.Spice A/D Tests - Revision history

Kazem Sabet: /* Defining RF Circuit Observables */

2015-08-02T06:04:30Z

‎Defining RF Circuit Observables

Kazem Sabet at 06:03, 2 August 2015

2015-08-02T06:03:00Z

Kazem Sabet at 06:01, 2 August 2015

2015-08-02T06:01:59Z

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Kazem Sabet at 05:57, 2 August 2015

2015-08-02T05:57:55Z

Kazem Sabet: /* Noise Test */

2015-08-02T05:55:54Z

‎Noise Test

Kazem Sabet: Created page with "B2.Spice A/D Test Panel This section describes the details of the various test types available in B2.Spice A/D. You can specify one or..."

2015-08-02T05:55:09Z

Created page with "B2.Spice A/D Test Panel This section describes the details of the various test types available in B2.Spice A/D. You can specify one or..."

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 [[File:RFAC4.png|thumb|200px| Setting the parameters in the AC Frequency Sweep Test Panel.]]
-==Defining RF Circuit Observables==
+===Defining RF Circuit Observables===
 Before you run an AC frequency sweep test of your RF circuit, you need to set the sweep [[parameters]] and define the output data for plotting or tabulation. The frequency sweep [[parameters]] are set from the test panel of the Toolbox. You set the start and stop frequencies, the frequency interval type (typically linear) and the frequency step. In the lower part of the test panel, you define your simulation output data. Click on the buttons labeled "Preset Graph Plots..." or "Present Table Plots..." to open the Edit Plot List dialog. The dialog gives a list of all the node voltages and currents. You can choose different complex data formats such as Mag/Phase, dB/Phase or Real/Imag.
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 </tr>
 </table>
 == Network Analysis ==

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-== AC Frequency Sweep of RF Circuits ==
+=== AC Frequency Sweep of RF Circuits ===
 The simplest RF circuit analysis type in [[RF.Spice]] is the "AC Frequency Sweep" Test. As mentioned earlier, this is identical to the AC frequency sweep test of [[B2.Spice A/D]]. The only difference here is that the frequency-domain models of [[Multiport Networks|multiport networks]] and transmission line segments or components are added to the analog or mixed-mode simulation of your circuit. Just as in [[B2.Spice A/D]], the AC Test is run from the Test Panel of the Toolbox.
-==Defining Sources and Loads==
+===Defining Sources and Loads===
 Just as in low frequency circuits, RF circuits must be excited using a voltage or current source. However, in order to ensure a successful RF circuit simulation, your source must be a single-frequency (sinusoidal) AC source. Remember that in [[B2.Spice A/D]] circuits, you must specifically designate a source to operate as an AC source for all [[tests]] of the AC type. The RF Menu of [[RF.Spice]] provides two additional types sources: the AC voltage source with the keyboard shortcut "Alt+V" and the AC current source with the keyboard shortcut "Alt+I". These sources are identical to the regular voltage and current sources of [[B2.Spice A/D]], whose "Use" checkboxes in the AC section of their source property dialog are automatically checked.
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 [[File:RFAC3.png|thumb|600px| A more realistic version of the previous RF circuit including connecting transmission line segments.]]
-==Using Transmission Lines for Connecting Parts==
+===Using Transmission Lines for Connecting Parts===
 You can use Generic T-Line segments or physical transmission line types to connect the various RF parts and devices in your circuit. The opposite figure shows the same simple RF circuit of the previous figure, but containing two T-line segments, one connecting the source to Port 1 of two-port N1 and the other connecting Port 2 of N1 to the resistive load. Note how the negative input and output pins of both T-line segments have been grounded. Lossless transmission line segments cause a phase shift of the propagating signal, while lossy [[Transmission Lines|transmission lines]] also cause additional signal attenuation.

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 [[File:b2MAN_Fig5.png|thumb|160px|B2.Spice A/D Test Panel]]
 This section describes the details of the various test types available in [[B2.Spice A/D]]. You can specify one or more [[tests]] to be performed at the same time. This is done using the checkboxes available for each test type in the "Test Panel" of the Toolbox. Most [[tests]] offer three options: Basic, Sweep and Monte Carlo (M.C.). The "Basic" test is a single-run simulation, while in a "Sweep" you vary the value of a device parameter. The "Monte Carlo" simulation provides an opportunity to examine the statistical behavior of your circuit given the tolerances for some part values.
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 </table>
 [[File:b2MAN_Fig203.png|thumb|200px|A typical DC operating point table.]]
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 The results of a DC sensitivity test are displayed in a table window. The left column of the table lists the part [[parameters]] and the right columns shows the derivative of the output voltage with respect to the respective [[parameters]]. For example, consider the simple voltage divider circuit of Tutorial lesson No. 1, which consists of a 1V DC voltage source in series with a 1k resistor and another 2k resistor. The output voltage is designated as the voltage across the 2k resistor. The results of the DC sensitivity test for this circuit indicate that the output voltage is increased by 666.66mV for every 1-volt increase in the input source voltage, it is decreased by -1.111 mV for every 1 Ohm change in the first resistor's value, and it is increased by 555.55 microvolts for every 1 Ohm change in the second resistor's value. Note that these are all small-signal operating point results.
 [[File:b2MAN_Fig51.png|thumb|200px|AC Sweep Test Settings.]]
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 </table>
 [[File:b2MAN_Fig61.png|thumb|200px|Noise Test Settings.]]

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 <p>&nbsp;</p>
-[[B2_digital | Digital Circuit Simulation]]
+[[Image:Back_icon.png|40px]] '''[[RF.Spice_A/D | Back to RF.Spice A/D Wiki Gateway]]'''
-&nbsp; [[File:larr.png]] &nbsp;
-[[B2.Spice_A/D  | Back to B2.Spice A/D Wiki Main Page]]
-&nbsp; [[File:rarr.png]] &nbsp; [[parameters| Using Device & System Parameters as Variables]]