That's something usual for device manufacturers, so if you can find a similar netlist for the device of interest, then you're ready to go. model qpnpnom pnp (is=1e-15 bf=100, vaf=85, cjc=5pf)Īs you can see, the simulation model is provided as a SPICE sub-circuit (.SUBCKT) netlist. * Pin 4 is not used on the 2180-series VCAs. * Note: Macromodel net numbers correspond to the IC package numbers. * Changed names for THAT2180A, THAT2180B, THAT2180C * Copyright 1997 THAT Corporation, all rights reserved. * THAT 2180A VCA SPICE Macromodel, Beta Version 1.B4 12/30/97* Open for instance the '2180_Macro_01.lib' file with your choice of text editor: * = lib files containing SPICE macro-models (one for each device in their catalog):Ī SPICE macro-model is actually a text file you can open.

You can download a zip archive from there.ĭownload and extract the ' THATMacroModels-Rev05' archive. THAT provides SPICE models for their device range. Such process is also called AGC (Automatic Gain Control) and is a very common feature of several analog processing chains. A dynamic processor adjusts in real-time the gain of the amplifier stage in order to keep the output amplitude under control. Such circuit can be used for amplitude modulation, and more commonly for dynamic processing of audio signals. A VCA (Voltage Controlled Amplifier) is basically an amplifier, whose gain is controlled by means of additional inputs.

Let us consider the 2180 VCA series for instance. THAT is an IC design house that built a strong reputation over the years in the professional audio field with some really unique devices. Here, I'll be illustrating the matter with a device from THAT Corporation. ST©, Analog Devices©, Texas Instruments©, Linear Technology© for instance do provide SPICE models for several of their analog products. Tools are there if you plan to create your own model, but that requires a thorough knowledge of the circuit and usually involves a characterization campaign.įor commercially available analog integrated circuits, it is a common practice for manufacturers to provides SPICE models. To do that, you will need a SPICE model for that component. This tutorial covers the situation where you want to simulate a component (integrated circuit) that's not provided by any Cadence libraries.

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