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Has anyone installed IC6.10 on the 64-bit version of CentOS 6.4?
If so, any pointers would be appreciated. It seems to install OK, but gives missing library error (but the library is actually installed)...
Thanks
Re: Any experience in design 1uA 32.786KHz crystal oscillato
The simulator's algorithm can actually act to 'damp' the oscillation. The Gear integration algorithm will do this. I suspect that numerical roundoff errors might also. Trapezoidal rule integration routines are under-damped, which can...
Re: 120 dB, A-weighted
A-weighting is a filtering of the subject signal (such as noise) to approximate human hearing. Try using Google with "A-weighting"
It is often used in audio to specify noise levels, since the human ear is less sensitive to high and low frequencies.
Sometimes also noise...
Hi Wai-Ming
Here is the setup; you can use it in any simulator. We use Probe from Pspice to view simulation results, and it is easy to set up macros that do the calculations. Other waveform viewing tools, like the calculator in Cadence work as well...
Added after 1 minutes:
Sorry, the image...
Bandgap circuits usually magnify the amplifier offset by a factor, usually 8 to 12. That means if your resistors are well matched (by using unit resistors), the amp offset is around 25mV.
Perhaps the layout is not truly symmetrical. Pay attention to the metal 'environment' over your amplifier...
I designed pacemaker chips a while ago ... and we made Xosc's running on 100's of nanoamps.
A few comments about low-current crystal oscillators:
Very difficult to do transient simulation because of very high Q and long start-up transient. AC simulation is best predictor of correct operation...
vth measure
If you are asking how to measure Vt in the lab to use in spice, engrak's answer is very good. In addition, you must subtract 0.5*Vds (0r 50 mV) to be most accurate.
hspice problem ,too
Is this a PMOS device?
Try the following:
.options list node post
.lib \'F:\\hspice\\ms018_v1p4.lib\' tt
.op
vdd 1 0 -0.1v
vin 2 0 -1.0v
m1 1 2 0 0 p18 l=0.18u w=0.18u
.dc vin 0 -1.8v -0.1v
.plot dc i(m1)
.end
Extrapolate the curve to zero current.
Vto = Vextrap -...
Not above breakdown, but high enough so that impact ionization (hot electrons) is causing high substrate current. The device is probably intended for lower voltage, like 3.3.
Also note that the gds is pretty high here, due to the same effect.
Vdsat is the voltage calculated by the simulator...
Re: How can I model a photodiode (ActivePixelSensor) in HSpi
Using the n-well as photodiode:
This arrangement usually uses a connection to the n-well - as one terminal - with the p substrate on the bottom and the p+ diffusion on the top as the other photodiode terminal (connected together by...
Our company designed many APS CMOS image sensors.
If the photodiode is made from, for example, n+ in the substrate or nwell in the substrate, use the diode model that the foundry supplies for that structure. Make the diode w and L the size of your PD.
Use a current source to simulate the light...
IC4.4.6?
What we need is only the ability to read in an Applicon layout database and write out GDS2. So, really, all we need is PIPO. However, in IC5.0, that capability was removed; thus, the interest in the older version.
A Sun version would be OK, too. Linux is just easier ...
You might try using a voltage like 2.5 V on the non-inverting input of the opamp (pin 3).
Could be that the inputs are outside the allowable common-mode input range.
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