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If you have a capacitor charged to a voltage v1 then you connect another capacitor in parellel, which is charged to a voltage v2 then some charge from the capacitor charged to high voltage go to other capacitor and now , voltage across both those capacitor is v3, which is in between v1 and v2. this phinominon is (...)
Would anyone please provide some materials that talk about the charge sharing and bootstrapping in a charge pump? Journal papers, books? Thank you.
"charge sharing" Can you explain your question more exactly? Regards, SAZ
hi all, Does charge sharing in a charge pump affects the PLL jitter? Is there is any relation between the PLL jitter and charge sharing? pls reply Thanks & Regards SavithRu
charge sharing is important phenomenon in dynamic circuits you can think of this as: 1. There is finite capacitance of output node(Say node A) in a ckt. , and thus charge is stored in it (Say digital 1 level is 1v). 2. For this circuit when evaluation phase of next stage is started this charge is re distributed (...)
Hi all, I have doubt related to static CMOS circuits: Do we have the charge sharing and charge leakage problems in Static CMOS circuits ?? If yes,how ? If no, why ? Thanks, Sp3
Hi All, I remember during my phone interview, I was asked about charge sharing: 1) What it is (the interviewer was referring to charge sharing in Dynamic logic) 2) What are its advantages and disadvantages ? -- I was unable to talk about its advantages. Any ideas ? TIA.
I am reading "Digital Integrated Circuits" by Jan Rabaey. I have a doubt in charge sharing in digital CMOS design. Here's the In here the output is initially charged to Vdd. Now B=0 and A makes a transition from 0 t
Hi, Please see the attachment. This is the state at t=0 with C1 initially charged to Q and C2 to Q- ΔQ. Where, Q=C1*V=C2*V. 75377 My question is what will be the amount of charge in each of the capacitors after charge sharing.
Hi, In charge pumps to remove charge sharing a unity gain opamp is used. Again to minise current mismatch or increase resistance of current sources, a servo opamp can be used as shown in razavi books. I want to know which method is more helpful in minimising spurs? I have power constaraint and want to use only one
if there is not a unit gain opamp, voltage of node N1 and N2 would not change too much , so charge sharing is not terrible. N1 and N2 are floating up to the supply rails minus current source saturation voltage, the parasitic charge transferred to the loop capacitor might be "terrible" enough, CS saturation possibly causes addition
ther is a trade-off between transistor size and efficiency: larger transistors need more charge at their gate, thus there is a optimum value for the size. BTW, I think 75% efficiency is not so bad specially if it is low power! BEST!
A charge pump is a phase error intergrator. Two linear current sources , one postive and one negative (pumps), either add charge to (phase lagging error), or remove charge from (phase leading error) a capacitor (the accumulator). You will need to study "Feedback Control Theory" to understand circuits more completely. Some online (...)
hi i have a simple question in charge pumps: what is the role of the unity gain amplifiers when using differential charge pumps?
A charge Pump often use a opamp to eleminate charge sharing. so, what is the relationship between the opam Unit Gain BandWidth and PLL Loop Bandwidth(closed loop -3db)? Thanks.
Sorry for the late reply... The unity gain buffer is used to decrease voltage step at the CP output at turn on. Due to charge sharing between the output node and both other sides of the N or P switch, the voltage at the CP output shows a step when both swirchs are turned on, while in idal case the output, which is the control volta
Hi guys, i am plotting the current at the output of charge pump of PLL due to charging and discharging of Ip into the loop filter. I see some spikes and over shoots due to charge injection. I am not sure how to make a comment on the magnitude of injection. I would really appreciate if someone gives me some feedback. thanks:cry:
I don't understand the precharge? I know it is used to closed a row in bank, wrt to the active? But what is its purpose in the low-level electronics? Also what is its usage? do I have to do everytime I do a read in a row and want to read the next row, I have to precharge the first row first and then move to the second row? or can I just ignore i
Hi SLS is a switch-level simulator that can be used to simulate the logical and timing behavior of digital MOS circuits. In the simulator, transistors are modeled by grounded capacitors and a switched resistor. Each node in the network has a logic state O, I or X (for unknown), and each transistor has a state on, off or undefined. Many character
Hi Switch Level Simulator The SLS Simulator SLS is a switch-level simulator that can be used to simulate the logical and timing behavior of digital MOS circuits. In the simulator, transistors are modeled by grounded capacitors and a switched resistor. Each node in the network has a logic state O, I or X (for unknown), and each transistor has
here there's some tips: "When reducing the gate length of an MOS transistor, the depletion regions around the source and drain have also to be reduced, to avoid effects such as charge sharing and punchthrough. To scale down the depletion regions, the doping oncentration of the substrate can be increased and the biases applied (i.e. the supply vo
dll can used to acheive a quicker lock with the input.i have another question ,what is the main cause of jitter in a DLL.since in a DLL there is no VCO unlike a PLL,i believe the main causes should be the charge pump current mismatch and also the pfd charge injection and charge sharing phenomenon.correct me if iam wrong. (...)
You can use a pMOS and an nMOS transistor (minimum size) in parallel as a transmission gate switch. You can read about it on the internet. just Google. There will be charge-sharing problems, the solutions to which can also be found in text-books. I remember helping someone on the same topic; You can also use a voltage variable resistor with v
you can use the conventional phase frequency detector consisting of 2 flipflops and an and gate. you can find the information on it in most of the books. when you design digital gates, let's say an inverter, make the pmos 3 almost 3 times larger than the nmos so that you'll have same delays for 0>1 and 1>0 transitions and a threshold voltage of VDD
What are the advantages of transmission gates then? Hi there, first the tristate buffer has its advantages over transmission gate(TG);the tristate buffer is a buffered transmission gate. practically in design the TG has its constrains due to its bilateral nature as they conduct well in both directionsmaking the driving cap
Hi, I think the drop is due to the charge sharing to the parasitic cap. from the diode connected NMOS, in one clock cycle C*(1.8-0.5)=(C+Cpar)*VCCOUT_min so if the C is much larger than Cpar, the VCCOUT can be more close to VCC-Vthn.
ya, very interesting from design of view, it's not possible to implement a current circuit into charge sharing memory cell. cell of 1tsram is as same as dram structure. if you try to using current sensing in this kind of cell, you got a big trouble. since current of this cell appears only in the moment of wl turns on. After charge (...)
If you analyze the master slave architecture you'll find that on the rising edge of the clock (for positive edge trigerred the master master latch works on negative level) the data is transferring from master to slave .Due to RC delay it takes some amount of time (i.e. the hold time) for that. As far as your question is concerned that node is alre
1)exp various mosfet capacitance&their significance? 2)exp sizing of inverter. 3)give the expression for cmos switching power dissipation. 4)what happens to delay if u increase the load capacitance. 5)what happens if we increase the number of contacts or via from 1 metal layer to the next. 6)Draw a transistor level 2 i/p nand gate.explain it s
this is quite a common question asked in many interviews.There are two capacitors C.Intially one capacitor is charged to V volts while the other is at zero t=0,a switch connects both of them in parallel.Due to charge sharing the voltage at the node connecting both of the transistors become V/2 volts.Now the question is
Hi, thank you for replying. I want to do a hand calculation of the NAND3 gate. I wish I can have the instantaneous, average as well as worst case power consumption. I also want to take the charge sharing effect into consideration. The transistor we use is nano scale transistor, so I doubt I can not use the square law of current equation directly. W
I will use this opamp for sample and hold I think to use two path and ı try it. but because of clock's of sample and hold switches opamp settling time increase . I think its reason is clockfeedtrough and charge sharing. I use dummy switches for it but i didnt solve the problem.
does this overcome charge sharing and all the problems of tspcNo.moreover what about at what ratio should i increase the transistors near the power supplyI would start from twice the minimum width and increase by adding fingers until you are happy with the performance. I do not know of any analy
You can use capacitor with charge sharing for DAC.
"When reducing the gate length of an MOS transistor, the depletion regions around the source and drain have also to be reduced, to avoid effects such as charge sharing and punchthrough. To scale down the depletion regions, the doping oncentration of the substrate can be increased and the biases applied (i.e. the supply voltage) can be reduced. The
It might influence. Input capacitance of amplifier might have charge sharing with switched capacitors.
i design a cap type charge sharing sar adc , it needs to be dischage when each conversion cycle. please see the pic show as below , the node vx=0 when sampling mode , and it is pull down by N3. but when the hode mode , the N3 should be disable. but , since the vx will be negative voltage , the MOS N3 body diode will flow to have a leakage
what will be voltage if its ideal condition? 0 Volts. In ideal condition uncharged capacitor will be like a short circuit. Except C3. 0.8V will stays. :-D
If you are giving interview for a memory designer, you should have a strong understanding of MOS concepts. As a fresher interviewer expect only basics from you. 1. You should be able to explain MOS characteristics. 2. What are various effect of scaling? 3. Various types of memories 4. Read/Write operation of SRAM. 5. charge sharing with between mem
Dear all, Could anyone clarify what are the losses related to flying/output capacitors in a Switched-Capacitor DC-DC converter? As far I have studied there are three losses: 1. charge sharing loss 2. Charging and discharging loss 3. Capacitor bottom/top- plate loss. I am just confused about the first two loss components - whether th
I am looking for a schematic of a discrete charge sensitive amplifier for Pin diode photon counting, like for example Amptek A250 or Hamamatsu H4083. Those amplifier are based on low noise Fet. They work well but cost > 200? for the Hamamatsu and even more for the Amptek.
Hi my final year projuct is based on designing (PART LAYOUT PART SCHEMATIC) an 8x8 multiplier using charge recovery ie ADIABATIC. Ive collected alot of info surrounding the subject but Iam unsure of which method would be appropriate to use in my design, STEPWISE CHARGING/RESONANT CHARGING or ADL-2N-2N-2P?? thanks KLEOS
:wink: Hi friends, i search a High Side driver with integrated charge pump for automotive. Can somebody give me some tips ?? Thank you very much Regards
Hi Jeremi is a tool for realtime document sharing Jeremi is a tool for realtime document sharing. It supports distributed work on different documents or files by different people or project groups. It offers an always-up-to-date view of the project and its files and coordinates the dependency of the actual file status and access to th
For charge pump current, In market, many ICs using 5mA or 10mA. New ICs has embedded with new registers which can select the charge punp current to design for different loop time.
Hello All, Please, help. I need schematic of charge amplifier for presure sensor (piezoelectric). Regards
Who knows is there any PC utility (DOS or Windows) which can change or program the notebook battery charge IC (BQ2040 of TI) register (on EEPROM also inside the battery) via the SMbus (SMBbus) ? My notebook battery always report wrong battery status which cause my notebook shutdown even in MSDOS after few minutes after the AC power removed. I
Hi all, Does anybody have any papers,links resources etc on charge pumps as used on a phase detector in a PLL. I know it usually consists of two transistors but anybody have a circuit ?? cheers Ody
i want to design a charge pump pll,who can give me some papers?
charge a 3v lithium coin cell (like CR2032) ??? I dont think that you can charge a standard Litiumcell . see ya Danger of explosion if recharging is attempted !!!