Search Engine www.edaboard.com

17 Threads found on edaboard.com: Switched Capacitor Negative

Power Efficiency Calculations of Switched Capacitor DC-DC Converter

Hi everyone, I'm designing a step down switched capacitor (SC) dc-dc converter. I'm using a spice simulation in order to observe the behavior of the circuit. I want to calculate the power efficiency of the SC converter. efficiency=Pout/Pin. pout=Iou*Vout which is constant. The problem here is the Pin since the current is fluctuating bet

switched capacitor integrator satuartion and low dynamic range

Hello everyone !!! I am simulating a switched capacitor based integrator in Cadence. the problem is that the integrator saturates for very low values of input voltages. Also if i give a sinewave input of 100mV amplitude (riding over 0.9V dc; for 180nm technlogy), the output shows a sinewave which never goes below 0.9V. Can somebody expalin the

Op-amp Negative output

The only circuit that can be used to get an output beyond VCC-VEE range of the supplied circuit is a circuit called "charge pump" . It is basically a switched capacitor circuit that can be used to generate a voltage greater than the available power supply. It is a quiet complicated circuit and you have to be very careful not to cause any damage to

ICL7660 to generate -3v for negative gate bias is a good choice? (adds Phase noice?)

in general any switcher regulator will work. Since a gate typically draws no dc current, u might use a switched capacitor type regulator (no pesky magnetic field to shield). A simple R-C filter with a whopping big C should filter out the noise enough for most applications. Of course, if you are looking for very low phase noise, linear supplies

stray capacitance for a switched capacitor integrator

can somebody tell me why the stray capacitance at the input and output of the switched capacitor circuit attached can be ignored? I dont understand why it can be ignored if the output impedance is low. It also says in the slide that if a stray capacitance is connected to a voltage source it can again be ignored...Need some help understanding

Positive to negative voltage converter

As mentioned, we need to know your current requirements on the negative 12V. However... switched capacitor convertors are nice and easy: The ICL7660S converts a +1.5 to +12V into an equal magnitude negative output. It only needs two capacitors for a basic circuit - no inductors. The LT1054 is simila

Negative capacitor value in switched capacitor filters

I saw negative value for capacitors in SC filter calculation manuals. What it means? How to perform it in cadence? Thanks.

positive to negative converter

For small currents and voltage up to 12V (maximum), a switched capacitor converter like ICL7660 can do, otherwise you need a switched mode converter in inverting configuration. Many standard buck converters can be used in inverting mode similar to this application note:

Is MC1488 equivalent to MAX232?

The MC1488 is a quad line driver. The MAX232 has two drivers and two receivers. The MAX232 generates the negative voltage needed, using a switched capacitor circuit. The MC1488 doesn´t generate it and must have a negative power supply (Vee). Just take a look at the MC1488´s datasheet.

TL071 Negative power supply?

A 7660 switched capacitor voltage converter can do, if the circuit can work with a rail-to-rail OP, it's the easier variant.

Ac analysis of switched capacitor circuit

1.) AC simulation is a small signal analysis and works only for linear and time-invariant circuits. 2.) Therefore, when s/C circuits are going to be simulated in the frequency domain, it is necessary to replace each switched cap with a time continuous element before. 3.) The most popular way is to use a combination of delay elements (artificial w

A Question About SC Integrators

The figure below is the differential output of a switched-capacitor integrator. The input is a 1 mV sine wave: 1m×sinωt. Theoretically the output should be 16m×(1 - cosωt) but it is 16m×(0.5 - cosωt) i.e. it has a 8 mV negative offset and I don't know why? The sampling frequency is 62.5 KHz and the integrator structure is the (...)

Level Shift from 4.2v to -0.7v?

May be you can try with a switched capacitor voltage converter from positive to negative voltage e.g. ICL7660: Bye Powermos Thanks, TekUT. I know this way to generate a negative voltage by switched-cap. voltage inverter. I want to know the other ways to ge

switched capacitor voltage converter

Hello, all I want to design a negative voltage with switched capacitor voltage converter like TL7660. I was wondering how to take some problems like latch up, power loss. Hope someone give me materials on that. Thanks.

Negative resistance with switched capacitor

I know this is very fundamental but I could not grasp it correctly. The circuit in the left shows a positive resistor while the one at the right shows a negative resistor. Here's my analysis on the positive resistor. Assuming from S1 is on from 0 to T/2 but off from T/2 to T, S2 is off from 0 to T/2 but on from T/2 to T. V1 is the voltage at t

positive to negative voltage IC

for low power apps you can use MAX1044/ICL7660 (switched-capacitor Voltage Converters) for more power you can use any switchin IC source like MC34063 in voltage inverting configuration (for this you need an inductor). hope this helps, //a

switched capacitor dc-dc converter

A book about switched Mode Power Supply Can you re-post the book ?