53 Threads found on edaboard.com: Less Than Zero
hi , I designed conventional single inductor two output dc-dc boost converter in psim. means inductor energy is stored and thrown to 1 output at one cycle and charged and discharged to the 2nd output at next cycle. the two outputs are sensed by using voltage dividers and time multiplexed using analog mux at the speed of half of the switching freq t
Power Electronics :: 08-13-2016 05:54 :: areebaa :: Replies: 2 :: Views: 299
Most easily achieved by omitting useless R6. Otherwise must connect a dummy resistor from RG node to ground, e.g. Gohm value.
Software Problems, Hints and Reviews :: 01-14-2016 16:16 :: FvM :: Replies: 6 :: Views: 926
THe Triac is rated for 600Vp and the motor locked rotor current is (5.02 Amps rms)
So the voltage of the MOV must be less than 600V at the rated locked rotor current when the triac is open circuit.
The QUestion is, what is the inductive energy stored in a "locked rotor" or motor changing direction at zero speed, when switched off that must (...)
Professional Hardware and Electronics Design :: 11-12-2015 16:22 :: SunnySkyguy :: Replies: 3 :: Views: 624
I want a circuit that inputs V volts and outputs V-Vth volts, where Vth is the threshold voltage of a pMOS or nMOS.
Is a circuit possible? I tried with pass-transistors, its not happening.
Analog Circuit Design :: 07-31-2015 20:14 :: Debdut :: Replies: 6 :: Views: 556
When secondary current falls to zero, there may still be some residual magnetic energy stored in the core which leads to a ringing waveform in the primary.
This is a result of having less than 100% perfect coupling between primary and secondary. The looser the coupling, the more likely the voltage waveforms in primary and secondary will (...)
Power Electronics :: 07-04-2015 23:55 :: Warpspeed :: Replies: 1 :: Views: 255
I'm sure there are many ways to solve the problem, but the decision would be always based on detail informations that are missing in your posts yet. You say e.g. the frequency range is 20 to 200 Hz which sounds less than perfect for an ignition unit that should preferably work from "zero" speed upwards.
Other points are noise and possible (...)
Analog Circuit Design :: 11-16-2014 11:39 :: FvM :: Replies: 9 :: Views: 1004
I got this warning when back annotating an sdf file. What exactly does it mean and will it cause any problems?
ncelab: *W,SDFNL2 (,35120|7): The sum of the two annotated limits to $setuphold, $recovery or $recrem timing checks are less than zero for instance :UUTreg , setting negative limit(s) to 0 <...sdf, line 17994>.
ASIC Design Methodologies and Tools (Digital) :: 03-30-2014 20:59 :: dw_man :: Replies: 0 :: Views: 946
This is nothing but just a clock divider code.
If the input clock is 50MHz, then the output will be 1Hz,
means its a divide by 50,000,000.
But there are mistakes here
1. If you really want 1Hz, then you should give 24999999, instead of 25000000, because the counter includes the zero, or you can put the less than (< ) operator instead of (...)
PLD, SPLD, GAL, CPLD, FPGA Design :: 10-01-2013 05:48 :: imbichie :: Replies: 3 :: Views: 1441
Im working on BLDC sensorless algorithm using zero cross detection but i have a weird problem, the back emf appears when duty cycle is 100% is
and with duty cycle less than 100 is
while ideally when phase goes from low to high or vice versa, its in slope form, but it is not th
Electromagnetic Design and Simulation :: 09-10-2013 05:41 :: ashugtiwari :: Replies: 0 :: Views: 398
Each logic family specifies its input requirements to recognize a logic one or zero as VIL and VIH.
For example for TTL ViH =0.8v and VIH=2.0v. Any value less than .8v is considered a logic zero and Any value greater than 2.0v is considered a logic one. An input between .8v and 2.4v is invalid.
Similarly the (...)
Elementary Electronic Questions :: 03-24-2013 19:25 :: albert22 :: Replies: 10 :: Views: 1164
Maybe subtract your desired number (which is 6), then do:
BEQ (branch if equal to zero)
BNE (if not equal)
BMI (if minus)
BLT (if less than)
BGT (if greater than)
The 'branch' command jumps forward or backward the stated number of bytes (in two's complement).
Microcontrollers :: 03-01-2013 05:15 :: BradtheRad :: Replies: 8 :: Views: 812
If X is an 8-bit value it can't be more than 255 and a check for less than zero is meaningless if it's an unsigned value so I'm guessing it's an 'int' (signed).
It isn't a function in the programming sense, it's a query. It reads as "if the value of X is more than 255 or the value of X is (...)
Microcontrollers :: 02-23-2013 10:18 :: betwixt :: Replies: 3 :: Views: 489
I think, R4 is intended to achieve safe behavior in case of wire break. I don't exactly understand what you intended by omitting it?
The shown TC amplifier is less-than-perfect, because TC respectively wire resistance have a certain effect on zero and scale. It might be a problem either with long wires or very thin TCs that can have up to (...)
Analog Circuit Design :: 01-27-2013 16:50 :: FvM :: Replies: 5 :: Views: 787
How do I know if the accelerometer is 0 degree or 180 degree when they have same output value?You'll get more ambiguities by rotating the accelerometer around other axes. For an unequivocal detection of spatial orientation, you need not less than 3 orthogonal accelerometer channels.
Elementary Electronic Questions :: 01-24-2013 19:14 :: FvM :: Replies: 5 :: Views: 517
Hi, I have an all-digital design that would benefit greatly from the ability to add fine-grained, in-the-field adjustable delays significantly less than one gate delay (FO4). These delays are not critical to functionality -- if they don't work, the chip won't be a total loss; it will simply underperform.
My plan is to include current-starved in
Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 10-29-2012 00:26 :: quantized :: Replies: 2 :: Views: 501
There's a manufacturability gap where you can't reliably
pattern below a certain spacing. zero gets merged, any
as-printed spacing less than your well depth has a chance
of the implant drive connecting them anyway.
Then there's the question of just what a narrow-base
lateral NPN looks like, to your circuit.
Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 09-11-2012 15:42 :: dick_freebird :: Replies: 4 :: Views: 819
You are best to not exceed the motor current rating as well..
Can you drive with zero Volt by shorting Motor with no Voltage applied then remove short then apply reverse voltage in rapid sequence?
The FETs ON resistance ~5 mOhm, if much less than ESR of the motor then most of the energy will be dissipated in the motor., but that may still (...)
Power Electronics :: 08-28-2012 15:44 :: SunnySkyguy :: Replies: 8 :: Views: 1563
The easiest way is to level-shift the pulse train up into the positive region.
Attenuate as necessary so it ranges from zero to 5V (or your supply V).
Incoming positive pulses will become higher than V/2.
Incoming negative pulses will become less than V/2.
Idle periods will be at about V/2.
You must set thresholds for (...)
PLD, SPLD, GAL, CPLD, FPGA Design :: 08-03-2012 19:08 :: BradtheRad :: Replies: 3 :: Views: 1147
I am doing a fuzzy based mppt controller for PV array. now from different sources i have seen that the output membership function which is duty cycle is in a range of -4 to +4, now my question is that if we need a value of less than zero as duty cycle to get mppt, then how to use that negative voltage as duty cycle because duty (...)
Microcontrollers :: 05-16-2012 18:31 :: hridz :: Replies: 0 :: Views: 489
SSRs often use Triacs or SCRs, not just MOSFETS. You MIGHT be able to design a less expensive discrete solution, but other nice features like zero-crossing, etc. will add complexity. You need to consider the tradeoffs.
Analog Circuit Design :: 02-24-2012 13:19 :: barry :: Replies: 21 :: Views: 8397
This may helps you...
there is no other direct function for the same.... if you are using the real number which is less than zero will round as 0 only.
there are other method which will consider the decimal part,
PLD, SPLD, GAL, CPLD, FPGA Design :: 02-23-2012 12:42 :: imbichie :: Replies: 1 :: Views: 1493
Sampling at 2x the maximum frequency does not guarantee signal reconstruction. At best it will detect the presence of the maximum frequency Fourier component , but the amplitude estimation is not guaranteed. It can vary from zero to the actual amplitude of the fmax Fourier component. (depends on the sampling phase, Sampling at less than 2x (...)
Digital Signal Processing :: 01-23-2012 19:06 :: klystron :: Replies: 9 :: Views: 1316
For example you are using BPSK modulation, and the bits after decoder is between i.e -0.593 -0.29 etc.
So if the symbols are greater than 0, it is 1
if it is less than zero it is -1 this is what we call hard decis.
This is same for all coding types if you use BPSK modulation..
Digital communication :: 10-18-2011 15:28 :: lapolm :: Replies: 5 :: Views: 821
For the same power ratings, transformer size of forward converter is smaller than flyback. Output current ripples in forward converter is also less than flyback. In CCM mode, right half plane zero in flyback poses a control challenge.
Power Electronics :: 05-31-2011 12:19 :: u04f061 :: Replies: 23 :: Views: 4382
It takes 1uS for 4 amp to ramp down to zero with 40 volt drive on 10uH leakage, and a further 1uS to ramp up again to 4 amp with 40 volt of drive, you are seeing the net effect of leakage inductance impedance opposing the AC current you are trying to push through the transformer.
While the current thru the Tx is less than the current in (...)
Power Electronics :: 03-18-2011 06:55 :: Orson Cart :: Replies: 1 :: Views: 2890
I would like to impose two condition on a matrix
1. if the value is less than -1, then the value of respective element will be zero
2. if the value is greater than 1, then the value of respective element will be zero
I need to do it by one command (I don't want to use for loop since it (...)
Digital communication :: 11-25-2010 21:06 :: tombraided :: Replies: 0 :: Views: 570
How to set a radio button in matlab gui to be automatically change its value property condition?
if 1 is less than zero, the value property of radio button will automatically change to "1"
if not, the value property of radio button is still on "0" condition
Please help me
Digital Signal Processing :: 10-08-2010 14:16 :: fikrul :: Replies: 1 :: Views: 7359
I am designing a 2.4GHz PA using AsGa, but the S21 is less than zero.
I want to know whether it is normal?
thanks very much!!
RF, Microwave, Antennas and Optics :: 08-20-2010 14:41 :: contral :: Replies: 1 :: Views: 623
Think of it as a relay, like it looks. If you don't edit the von, voff
properties then it simply closes when the control terminal
difference is greater than zero.
However changing the properties to make it open / close
over a finte range, and have finite nonzero conductance
in both states will make it less "ideal" (...)
Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 06-26-2010 01:52 :: dick_freebird :: Replies: 1 :: Views: 1641
This does not mean that an unmodulated transmitter signal that is continuously switched on, will not take up bandwidth on the specific frequency part of the radio spectrum.
If you switch it on and off, now the signal is modulated (ASK = amplitude shift keying) and the modulation determines the bandwidth.
RF, Microwave, Antennas and Optics :: 06-14-2010 08:19 :: volker_muehlhaus :: Replies: 7 :: Views: 947
The zero mains voltage waveform is more or less meaningless, but it doesn't seem wrong anyhow. The 10V AC waveform shows the
output transistor in operation. You must consider, that you won't see a squarewave at this high operation frequency
rather than soft, resonant switching. Most likely the waveform shows regular behaviour.
Elementary Electronic Questions :: 05-12-2010 21:24 :: FvM :: Replies: 3 :: Views: 1613
what is pinch off?
and why current is not zero if vds ≥ (vgs-vp)?
A JFET operates by shutting off an already formed channel between source and drain in the transistor, unlike a MOSFET where the gate voltage creates a channel between source and drain.
I think you mean vds less than vgs-vp. The drain to source in
Elementary Electronic Questions :: 11-15-2009 12:18 :: snafflekid :: Replies: 1 :: Views: 1852
Like the problem is I couldnot get less than 2V when microcontroller is active(that is when inputs are applied). I am using AT89S51.
It's output is working on logic zero.
I want to get less than 1V to properly operate the relay.
Microcontrollers :: 06-20-2009 18:15 :: Adil Israr :: Replies: 9 :: Views: 16304
You may want to take a look at:
# The purpose of this verification project is to verify an AIS detect DUT. The DUT detects AIS as explained below:
# The DUT declares an AIS if there are less than two zero bits in last two sequences of 512 bits in an input stream.
# The input stream is recieved via a simple interface: data byte and data (...)
PLD, SPLD, GAL, CPLD, FPGA Design :: 06-18-2009 06:08 :: pini_1 :: Replies: 0 :: Views: 1621
The negative 3 V will be a problem; clamp the input with a suitable diode.
The FPGA will "read" the input voltage of more than 2.3 V as a binary 1 and less than 2.2 V as a zero
Elementary Electronic Questions :: 05-19-2009 15:30 :: klystron :: Replies: 4 :: Views: 1143
In the last years, i have found that some antennas with less gain (or size) can equal to a offset dish with bigger gain/size...why does this happens?
I give three At just 43cm, this powerful dish offers the performance of an offset 60cm dish.
Gain (dB): 33.0"
RF, Microwave, Antennas and Optics :: 09-20-2008 16:21 :: nadabro :: Replies: 3 :: Views: 1756
Sound signal power is not accumulative, means that the pressure would not add more if we apply more sound. So, in this case, if the ambient sound is already 40dB, than you cannot measure sound less than that. Different from light, if you measure the ambient is about 1Cd, a 0,5Cd light can be measure by offset zero the (...)
Mathematics and Physics :: 02-08-2008 09:28 :: rikie_rizza :: Replies: 3 :: Views: 1289
The two figures are DEFINITELY NOT THE SAME!
Figure A has positive feedback greater than unity and will tend to either collapse to the zero current state or increase to an extremely high current state.
Figure B has positive feedback less than unity and will tend to go to the expected current state, as long as there is (...)
Analog Circuit Design :: 07-18-2007 19:21 :: JPR :: Replies: 15 :: Views: 1545
As far as I know, convergence refers to having a solution which results in an error which is less than the target. In a circuit simulator, the routine is trying to solve for the node voltages while trying to make sure that algebraic sum of currents into that node is zero (Kirchoff's Current Law - KCL). Instead of zero, a (...)
Elementary Electronic Questions :: 07-09-2007 01:26 :: v_c :: Replies: 2 :: Views: 857
Hello, everyone! I have a level49 bsim3v3 mos model. I use it to simulate some circuits using hspice. But the .lis file shows that fatal: Delta=*** is less than zero when some w and l is used. But other w and l is ok. Could anynoe tell me why?
thanks very much!
Analog Circuit Design :: 05-20-2007 12:45 :: colinwang :: Replies: 0 :: Views: 933
Input offset voltage is the voltages aplied to the inputs of OP amp so as to take out zero voltage from the output of it. Normally, it is less than 1 mV, a noise level.
Elementary Electronic Questions :: 04-11-2007 11:31 :: yjkwon57 :: Replies: 7 :: Views: 2279
I think RZ is having more BER than NRZ.
Manchester is having very less BER compared to other line coding schemes.
Digital communication :: 03-18-2007 04:18 :: tarakapraveen :: Replies: 3 :: Views: 10601
1/(C_OL*L_OL)^0.5 must be less than simulation min. frequency.
Analog Circuit Design :: 01-22-2007 14:39 :: mark_nctu :: Replies: 23 :: Views: 8892
can anyone help me to find very low leakage mosfet ?
zero gate voltage drain current should be less than 100 na.
Professional Hardware and Electronics Design :: 11-01-2006 09:55 :: mystery :: Replies: 0 :: Views: 1917
For the analog signals, it is easy: the 4-20mA range actually was designed especially to allow you to distinguish a loss of signal from a zero signal. Therefore, if you measure something that is much less than 4mA, you know there is no sensor present (or the wires are broken or shorted).
For the digital signals you are describing, things (...)
Professional Hardware and Electronics Design :: 08-09-2006 22:49 :: VVV :: Replies: 2 :: Views: 1478
Can the noise figure of an amplifier be less than unity? as i made ADS simulation of noise, and obtain NF in values sometimes less than unity.. what's its units ? dB or ratio?
Also, how can it be less than one?!?!?!
thanks in advance,
RF, Microwave, Antennas and Optics :: 07-10-2006 01:01 :: ahmad_abdulghany :: Replies: 2 :: Views: 1527
Mosfet are a active load
BJT are the current, but the right one has a less current than the other one.
Elementary Electronic Questions :: 04-06-2006 15:12 :: Miguel Gaspar :: Replies: 5 :: Views: 1101
The structure of the two algorithms are similar, but multiplications in ZF are simpler (one of the terms comes from a small set of values).
Their convergence properties are different: A necessary condition for the convergence of the ZF algorithm is that the eye must be initially open (peak ISI less than 1). MSE algorithm does not have this type of
Digital communication :: 02-17-2006 18:49 :: zorro :: Replies: 11 :: Views: 3881
I am doing a project titled "Power Modelling of embedded SRAM". There are 2 types of SRAM cells that I need to take care of one is the standard SRAM and the other is the assymetric SRAM cell (where writing a zero is significantly less energy consuming than writing a one). The model should provide an estimate of the power (...)
Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 11-17-2005 15:29 :: kamesh419 :: Replies: 0 :: Views: 842
I need an IC which can perform the following function.
(1) Just ONE voltage input, Vin.
(2) Just ONE voltage output, Vout.
(3) If Vin is less than a threshold (say, 1.8V), Vout is zero.
(4) If Vin is larger than this threshold, Vout = Vin.
I have considered to use a voltage (...)
Hobby Circuits and Small Projects Problems :: 07-22-2005 19:53 :: woody28 :: Replies: 6 :: Views: 974