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freq divider pins in rflib

ddis

hi all, i want to divide the o/p freq of Quad-VCO i.e. 4.8 GHz into 2.4 GHz. for this purpose i need a freq divider ckt. i saw the freq divider from RF library in cadence. it is containing 4 pins (pin, pout,nin, nout).

how to apply stimulus to this pins & check the o/p

i dont know what nout stands for here

pin might be i/p power, pout might be o/p power

nin might be divide no.

 

 

Parents

  • Most likely you have tt set to too large a value (or left blank). The default value of tt is 0.01 seconds (which is rather long, so the output probably doesn't change unless you have a very slow clock).

    I had the following parameters:

    n=8
    nhi=2   # output will be two pulses of the input pulse wide
    dir=1
    tt=1n
    vdd=1.2
    vss=0
    thresh=0.6  # this will be the default since it is (vdd+vss)/2.

    I had this connected to a vsource in "pulse" mode with:

    Zero value: 0
    One value: 1.2
    Period of waveform: 1u
    Rise time: 1n
    Fall time: 1n
    Pulse width: 500n

    Attached is a picture. This works exactly as you'd expect.

    Regards,

    Andrew.

Reply

  • Most likely you have tt set to too large a value (or left blank). The default value of tt is 0.01 seconds (which is rather long, so the output probably doesn't change unless you have a very slow clock).

    I had the following parameters:

    n=8
    nhi=2   # output will be two pulses of the input pulse wide
    dir=1
    tt=1n
    vdd=1.2
    vss=0
    thresh=0.6  # this will be the default since it is (vdd+vss)/2.

    I had this connected to a vsource in "pulse" mode with:

    Zero value: 0
    One value: 1.2
    Period of waveform: 1u
    Rise time: 1n
    Fall time: 1n
    Pulse width: 500n

    Attached is a picture. This works exactly as you'd expect.

    Regards,

    Andrew.

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