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VCA_Setup (Voltage Controlled Amplifier Setup)

Symbol

Available in ADS

Parameters

Name

Description

Units

Default

Freq

Fundamental frequency; must be a non-negative real number

GHz

1.0

Order

Order for Harmonic Balance simulation inside extractor; must be an integer greater than 0

None

10

Pin_Start

Start value for sweep of large-signal input power; must be a real number

dBm

−50.0

Pin_Stop

Stop value for sweep of large-signal input power; must be a real number

dBm

20.0

Pin_Step

Interval for linear sweep of large-signal input power; must be a positive real number

dB

10.0

Vcontrol_Start

Start value for sweep of control voltage; must be a real number

V

0.0

Vcontrol_Stop

Stop value for sweep of control voltage; must be a real number

V

1.0

Vcontrol_Step

Interval for linear sweep of control voltage; must be a real number

V

0.1

Notes/Equations
  1. VCA_Setup performs a swept control voltage and swept input power simulation of a circuit-level VCA and generates a dataset for subsequent use by the data-based system model VCA_Data. The use of this component is highlighted in the example project VCA_prj .
  2. VCA_Setup and VCA_Data work equally well for amplifiers with or without a control voltage. For amplifiers without a control voltage, the control pin should be grounded.
  3. In order for VCA_Data to produce an accurate model of the circuit-level VCA characterized via VCA_Setup, the Order parameter for VCA_Setup must be large enough to prevent aliasing of higher-order frequency components. For mildly non-linear circuits, an Order of approximately 5 is sufficient while an Order in the range 10-15 is recommended for highly non-linear circuits.
  4. Push into VCA_Setup in a Schematic window for a view of the swept Harmonic Balance simulation controllers. This component can be copied and modified to suit individual needs; typically, this would entail changing the Harmonic Balance controller HB1 to achieve more efficient simulations. For more information, refer to Harmonic Balance Simulation.
  5. When simulating an existing ADS2002 design containing a VCA_Setup instance in the current version of ADS, you must substitute a newer version of VCA_Setup. Failure to do this will result in the generation of warning messages and corruption of the extracted dataset.
  6. The extracted ADS dataset is assigned the name of the extraction design by default.
  7. It is possible to generate arbitrary multi-dimensional VCA datasets using a VCA_Setup component by applying a chain of ParamSweep controllers in the extraction level design and assigning the SimInstance[1] value of the inner-most sweep to be "Xi.Vcontrol" where "Xi" is the instance name of the VCA_Setup component in use. Vcontrol is a default uppermost sweep inside the extractor subcircuit, hence this assignment bridges the gap between the minimum viable parameters necessary for voltage controlled amplifier modeling and those necessary to adapt such a model for your own application needs. Refer to the example design CKT_VCA_extraction.dsn for an understanding of the multi-dimensional extraction process. The datasets generated by ADS2003C and prior versions of VCA_Setup are significantly different from that generated by the ADS2004A and subsequent versions. To learn how to access the customized multi-dimensional VCA dataset refer to VCA_Data (Voltage Controlled Amplifier).
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