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Recent content by ccarrot

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    Problems of post-layout simulation using Calibre LVS/PEX

    Anyone can help? Here is some more information of the netlist: The netlist of the schematic is: ============================== ========== .SUBCKT test A GND Vb *.PININFO A:B GND:B Vb:B MM1 Vb Vb GND GND nsvtlp_rf w=16.0 l=0.5 nfing=2 srcefirst=0 ngcon=2 m=1 + mult=1 ncrsd=1 MM2...
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    Problems of post-layout simulation using Calibre LVS/PEX

    Hi all: I'm facing a problem about the Calibre LVS/PEX, I will describe it using this simple current mirror shown below, X and Y are same MOSFETs with width=16, nfing=2, m=1: When I just do the layout with only one finger for both X and Y (w=16, nfing=1, m=1), and do the post-layout...
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    Help with the phase shifter/tuner.

    Hi, I'm going to design a phase shifter (or called phase tuner) with 0-90 degree tuning range. It works between 100MHz-200MHz, i.e. the input signals are two quadrature digital inputs with f=100-200 MHz. I checked a lot of references, but they usually works at RF band. I tried a...
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    Questions about injection-locked LC-VCO

    Hi everyone, I'm designing an injection-locked LC-VCO with f0=2GHz. The circuit is shown bellow, this is a PMOS-NMOS crossed coupled LC-VCO, the injected signal Vij is put through M1/M2 differential pair. The Vij comes form a LNA in the previous part and a capacitor is in between the LNA and...
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    What is the PSD unit by using FFT method in this post? Thanks!

    I'm just doing a power spectral density (PSD) analysis of a signal in time domain. I'm following the fft method described in : https://www.mathworks.com/support/tech-notes/1700/1702.html It gives the real physical unit for the PSD. However, the unit is "power", is that mean "V^2/Hz"? If yes...
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    How to explain such coil coupled signal increases when tested in water?

    Hi everyone: I have two coils designed in order to transmit squared pulses. They are standing face to face with distance of 10mm. The attenuation of received signal is supposed and tested to be -20dB in air, when I place a bag of salt water in between, the attenuation became to be about -12dB...
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    HELP: Not enough storage space when taking Transient simulation

    I used both methods for full guarantee. For example, I used the simulation time = 1s (run it for a month I don't care, as the results are recorded on a text file every half an hour), then I set: outputstart=1 and skipstart=0 then the "tran.tran" file is always 0bits----nothing to be saved...
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    What wrong did I make when making this PCB?

    Hi all: I'm a totally new in designing and fabricating PCB. I've made a very simple PCB on which there is just one Surface Mounted Device resistor on the upper-right corner (see the first picture), but when the PCB's back, the place where the resistor should be mounted is covered by the green...
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    HELP: Not enough storage space when taking Transient simulation

    Thank you so much erikl! It works! Thank you!
  10. C

    HELP: Not enough storage space when taking Transient simulation

    Hi everyone: I'm taking a long transient simulation in Cadence Spectre, the simulation is to calculate the BER(bit error rate) of a transistor-level circuit. Because I have a symbol which is written in Verilog-AMS to calculate the BER and store the result in a text file outside, so I don't...
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    Any one has the solution manual of Probablity and Random

    Hi friends: Any one has the solution manuals of Probablity and Random Process for Electrical and Computer Engineering, by John Gubner ? If so , could you send me a copy? Sooooooooooo thanks!! ccarrot2009@gmail.com

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