# How would I model an RF Input Source in HSPICE?

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#### robertbagundol

##### Newbie level 4
Hello everyone. I would like to know how do I model an RF input source in hspice? I would like it to have a definitive frequency but with varying, random voltage amplitudes. Would that be possible? The amplitudes would vary from 0.1 - 1.5 V and must be randomly generated. How would I do it?

#### robertbagundol

##### Newbie level 4
RF Energy Harvesting

Hello everyone. I would like to know how would I model the RF input for our RF energy harvesting. I find it hard because in real life, the signal that I will be receiving in my antenna would not have a uniform amplitude and frequency. But assuming that we focus on a certain frequency band, my only remaining problem is how to model that varying amplitude in our signal as the input. I have read that the received RF signal from the environment will be in terms of power (dBm), but I have no idea how to do this. If I can figure out how to represent the RF signal as the input, I can proceed in designing my rectifier. I'm using HSPICE as my simulation tool.

Thank you.

#### robertbagundol

##### Newbie level 4
I would like to emulate the RF signal that is present in the environment wherein its amplitudes are varying. I don't think pulses suits this.

#### FvM

##### Super Moderator
Staff member
my only remaining problem is how to model that varying amplitude in our signal as the input.
Think about varying the amplitude in a parametric sweep.

#### volker@muehlhaus

Re: RF Energy Harvesting

I think the 0.1-1.5V range is much too optimistic for power harvesting, unless you are VERY VERY close to the base station. Before you start simulations, you should grab a spectrum analyzer and get a feel for realistic receiced power levels at your frequency band of interest.

##### Super Moderator
Staff member
Look for an antenna in the list of components. Place it in a circuit. If you're lucky it automatically produces some signal. You may need to give it a connection to ground through a resistor.

Here's another idea. Arrange three or more AC generators so their signals mix (series or parallel). Choose frequencies at non-integer ratios so the output waveform is irregular.

Another idea. Look for a circuit which simulates a burning candle whose brightness changes more or less randomly.
Or create a Chua chaotic oscillator which works at a definite frequency but also contains some amount of randomness.

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