You will find no .pdf help file. The "lib" is usually just a MODEL string in a text file. To understand its SPICE parameters (e.g., IS, BF, RE), you must reverse-engineer it or trust a forum post from 2008.
The "Pro
The Proteus MC1496 Lib is a functional but flawed lifesaver for students and hobbyists simulating RF modulators, mixers, and analog multipliers. While it saves the cost of buying the obsolete IC, its lack of model transparency and quirky biasing requirements can lead to hours of debugging that wouldn’t happen on a real breadboard.
When using a new library, you may encounter these errors: Proteus Mc1496 Lib
| Error Message | Cause | Solution |
| :--- | :--- | :--- |
| "Model not found" | Proteus cannot locate the .MDF file. | Re-check the file path and run "Update Index." |
| "No DC convergence" | Floating inputs. MC1496 needs bias current paths. | Add 50kΩ resistors from input pins to ground. |
| "Logic state ambiguous" | You loaded a digital model by mistake. | Delete part, re-pick from "Analogue ICs" category. |
| "Time step too small" | High-frequency oscillation in the model. | Reduce Max Spice Time Step to 1e-9 in System > Set Animation Options. |
| Criteria | Score | |----------|-------| | Functionality | 4/5 | | Ease of Use | 2/5 | | Documentation | 1/5 | | Accuracy vs Real IC | 3/5 | | Value (free) | 5/5 |
Overall: 3.5/5 – Works if you know what you’re doing; useless otherwise. You will find no
| Parameter | Simulated Value | Datasheet Typical | Error | |-----------|----------------|-------------------|-------| | Carrier Feedthrough (50mV input) | -35 dB | -40 dB | +5 dB | | Sideband Suppression (1 kHz mod) | -42 dB | -50 dB | +8 dB | | Gain @ 1 MHz | 0.85 | 1.0 | -15% | | Input Impedance (Mod port) | 28 kΩ || 25 kΩ | Acceptable |
| Pin | Name | Function | Typical Connection | |-----|------|----------|--------------------| | 1 | CAR+ | Carrier/LO Input (+)| AC couple via capacitor | | 2 | CAR- | Carrier/LO Input (-)| AC couple or ground via resistor | | 3 | GND | Ground | Connect to 0V | | 4 | V- | Negative Supply (-8V) | -8V DC | | 5 | MOD+ | Modulator Input (+)| Signal input | | 6 | MOD- | Modulator Input (-)| Signal input or bias | | 7 | OUT+ | Differential Output (+) | Load resistor to V+ | | 8 | OUT- | Differential Output (-) | Load resistor to V+ | | 9 | V+ | Positive Supply (+12V) | +12V DC | | 10 | BIAS | Gain adjust / Bias | Resistor to V- |
In the Proteus symbol, pins are often numbered 1-10. Verify with the datasheet before simulation. In the Proteus symbol, pins are often numbered 1-10
For Proteus ISIS, you would create a new component with these pins:
| Pin | Name | Type | Description | |-----|------|------|---------------------------| | 1 | CAR+ | Input | Carrier input (positive) | | 2 | GND1 | Power | Ground (bias) | | 3 | MOD+ | Input | Modulating signal input | | 4 | MOD- | Input | Modulating signal input | | 5 | BIAS | Input | Bias adjust | | 6 | VEE | Power | Negative supply (-8V) | | 7 | GND2 | Power | Ground (output stage) | | 8 | OUT+ | Output| Differential output + | | 9 | OUT- | Output| Differential output - | | 10 | CAR- | Input | Carrier input (negative) | | 11 | VCC | Power | Positive supply (+12V) | | 12 | NC | - | Not connected | | 13 | NC | - | Not connected | | 14 | NC | - | Not connected |
Note: You can manually assign these pins in Proteus "Make Device" wizard.