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How to use rand_bit_stream for trasimpedance amplifier ?

salar1991

 hi i need to simulate eye diagram with cadence 6.14 for my transimpedance amplifier .transimpedance amplifiers input is current. i know i should use rand_bit_stream from ahdllib for generating random bits but its a voltage source and i need current source i saw that someone said Use VCCS but i dont know how to use rand_bit_stream with vccs because rand steam has 1 output but vccs has 2 inputs . another thing is how to make 2^31-1 bits i thought it means that we should do a transient simulation for 32767*period is that it? 

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  • Andrew Beckett

    Well, the vccs has a differential input, so if you've just got a single-ended input like the output from rand_bit_stream, then connect the negative input terminal of vccs to ground (gnd!).

    I don't know what you mean by making 2^31-1 bits. You should ask whoever is asking you to do this - it doesn't make a great deal of sense (and BTW, 32767 is 2^15-1, if that's even relevant).

    Regards,

    Andrew.

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  • Andrew Beckett

    Well, the vccs has a differential input, so if you've just got a single-ended input like the output from rand_bit_stream, then connect the negative input terminal of vccs to ground (gnd!).

    I don't know what you mean by making 2^31-1 bits. You should ask whoever is asking you to do this - it doesn't make a great deal of sense (and BTW, 32767 is 2^15-1, if that's even relevant).

    Regards,

    Andrew.

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