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Recent content by Engineer4ever

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    [SOLVED] Phase Jitter Manual Calculation

    Dear colleagues, Can anyone explain how this calculation is made? This is an example of integrating phase noise to get rms jitter. I calculated the rectangular area (0.063p) but I have a problem with calculating the other trapezoid sections. I divided each of them to a rectangle and a triangle...
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    [SOLVED] phase Noise/Jitter for VCO and ILO

    Dear colleagues, Your support is kindly needed as I have designed an Injection-locked ring oscillator and I needed to measure the jitter value. I made pnoise simulation and got the phase noise value before and after injection from the output graphs. However, jitter simulation seems a bit tricky...
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    PNoise Analysis of ILO

    By o/p I mean output. Apologies if it isn't clear, I always write it like that.
  4. E

    PNoise Analysis of ILO

    Thanks for your reply. By "o/p" I mean the o/p of the ILO. I inject the VCO with a 5-GHz and since it's a 5-stage super-harmonic ILO, its o/p is 1GHz.
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    PNoise Analysis of ILO

    Thank you so much :) I have one more question just to make sure I do it right: I inject my circuit with a 5-GHz signal and the o/p is 1GHz. Does it mean Sweeptype is "relative" in this case or still "absolute" as the circuit is actually driven?
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    PNoise Analysis of ILO

    Hello, I am running PNoise analysis for my Injection-locked oscillator before and after injection. Before injection, it's just a VCO, and in SweepType field, I choose "relative". However, when I inject a signal, "relative" option gets me the same PNoise of the VCO, which is not reasonable. My...
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    [SOLVED] VCO Phase Noise Measurement

    Hello, Your support is kindly needed as I have performed a pnoise simulation for my ILO at free-running frequency (1.52GHz). The graph below is the pnoise output graph but I actually don't know how to 'read' it. My questions are: how can I determine the offset frequency that I should measure...
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    [SOLVED] Max. Frequency in Cadence 130nm

    I am designing a ring VCO and I needed to calculate the max. oscillation frequency on the kit, that's why I used a simple VCO design to calculate its oscillation frequency and check whether the output of my actual VCO is within the kit's limit. In this case, DO I still need to calculate the...
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    [SOLVED] Max. Frequency in Cadence 130nm

    Hello, I needed to find the max. frequency that Cadence 130nm kit can support, so I designed a simple VCO using three minimum-sized CMOS inverters and I calculated the frequency of its output. Is this method correct? Thanks,
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    [SOLVED] Figure of Merit for Ring VCO

    Hello, I calculated FOM of my ring VCO using the following formula: The unit of FOM using this formula is dBF, but in the papers, the unit of FOM is pJ/bit. I searched for a formula to convert the first unit to the second one but I found nothing. Is there a formula for such a conversion...
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    [SOLVED] VCO different o/p frequencies

    Hi, I designed a 5-stage VCO using maneatis delay cell to produce ten spaced clocks at 1.6GHz. The problem is, the output clocks don't have the same frequency, there is a difference that ranges between 60~90 MHz between each two clocks. How is that possible? The five cells are replica of each...
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    Maneatis Cell- based VCO

    Hi, I am designing an 5-stage oscillator using Maneatis cells. Now, I do have a hard time knowing what things to do first. I designed the Maneatis delay cell but in order to keep the PMOS loads in triode region, I had to fix the value of (bp), which is actually (Vctrl) of the VCO, so that the...
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    [SOLVED] Control voltage range of VCO

    I am sorry but I don't know if I understand this part correctly. Do you mean sizing the PMOS transistors up to 10x their standard size (depending on the technology I am working on)?
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    [SOLVED] Control voltage range of VCO

    Thanks for your reply. So, is there no way to calculate an approximate value by hand analysis before simulation? I mean, how can I size the transistors properly if I don't have approximate values of Vctrl?
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    [SOLVED] Control voltage range of VCO

    Hi, I am designing an Injection-Locked Oscillator using a circuit that resembles that one, and I need to know how to determine the limits of Vctrl. I applied the condition: Vds<<2(Vgs-Vth) on the PMOS transistors (deep triode region) to get the upper value of Vctrl, but I don't know how to get...
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