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Why in RC integrator circuits , Caps are connected sometimes to supply voltage instead of ground ?
Thanks. One issue is that the output of the integrator is vdd or 0, since there is no dc feedback to control it, which gives a wrong simulation data.
Hi, The signal and noise transfer function of a continuous time first-order delta sigma modulator using an simple active RC integrator both have a pole at 1/RC. The transfer functions are attached.115966 I was wondering, ideally, why can't we make RC very small, so the quantization noise is lower in the band of interest?
caps are used to act a a temporary or transient current shunt to noise voltage, the current is an integrator of voltage, also a DC block or RF coupler or an impedance vs f filter for bandwidth control. There are millions of caps, with dozens of attributes, that define them uniquely. pick 1 and ask for details with example schematic if that he
Hi everyone, Can someone suggest some papers or books or insight into the calculations for integrated vs. non-integrator noise components of a CTIA? I can't seem to find much of anything online... Thanks in advance!
103527Hi All, I am studying the working of Delta Sigma(DS) and Incremental Delta Sigma ADCs. I am trying to implement those in Simulink. For DS I am getting proper output with noise shaping and good SNR. But when I am using the same structure for IDS with the reset connected to integrator, I am getting third and fifth harmonics
Hi all, I'm working on an optical sensor and am looking to increase my SNR. I've constructed a circuit to cancel out LED emitter noise with feedback control. PDref monitors just the emitter, while PDsig carries the sensor signal + emitter noise. Feedback consists of integrator -> JFET VCR -> current divider. Please see attached circuit. LT (...)
Hi, guy, I need to design a large off-chip capacitor as the feedback capacitor of a on-chip current integrator for a large input current (over 10uA). However, I also need to use the same integrator to detection low level current (1pA). I know the input node Iin is very sensitive to noise. However, pad connection to (...)
Hi, I am doing a 3rd-order 2-bit CIFF DSM, I used Scherier's delta-sigma ToolBox to do the system design, ideally i can get 130dB SQNR with OSR=128. but i found the b1 and c1 coefficients are small so that the capacitors for the 1st stage integrator are very large when doing thermal noise budgeting. for this reason i increased the OSR to 256, this
CIC uses modular arithmetic, overflow is by design. All CIC stages must have the minimal bitwidths according to CIC theory, then the output will be correct despite of integrator overflow.
As said, low-pass transfer function is different from integrator, thus you get different noise shaping. You may want to calculate it using the Schreyer's popular Matlab toolbox or a different method of your choice. First order SD noise shaping isn't mind blowing in any case, also the transfer function is at least similar to an (...)
Hi Jack, A sigma delta modulator consists of one feedback loop around an integrator and a quantizer. This integrator (since you have 1/S therefore continuous) producing a low pass filtering of the input signal and a high pass filtering of the quantization noise which is injected at the quantizer, hense noise shaping the (...)
The integrator has to be reset at t=0 and read-out at t=8h. I don't think that you'll prefer an analog electronic timer implementation. If simple digital elecronic isn't acceptable for this design part, an electromechanical timer would be appropriate, I think. As an additional comment, if you have problems to implement an accurate long time inte
Hi Everyone. I am implementing a Kalman filter for an accelerometer. As you know,the accelerometer can be modeled as a Random Walk process and the output of a random walk process is assumed to be coming out of an integrator driven by white noise. This is described in "Random signals and applied kalman filtering, Brown,Hwang" chapter 2&5. The book
Hi dinosaur ! And integrator can be used in many applications . for example converting an square wave to a triangle wave ( in SMPS or class D amplifiers or .... etc ) or perhaps as a funny wave shaper ! ( if you give a triangular wave to the input of an integrator you'll get something like a sine wave , but it is not pure ! ) and a differentiator
75140 Inserted picture is the lossy-integrator in my circuit. To precisely run Simulink, I would like to calculate input referred noise for this lossy integrator, but I just don't know how to calculate. Can anyone help me to calculate the input referred noise please?
So i do need to just make sure my maximum step size is small enough to do this integration correctly? In a short, yes. You can review the datasheets of energy measurement chips, e.g. from Analog, that are all providing digital integrators for di/dt sensors and check the implementation parameters.
designing a Sigma delta 2nd order...CIFF architecture.... in literatures they hav suggested to use more linear and low noise first integrator for better they said first integrator is a power hungry one... bt where the difference in design of low noise cum low power OTA and other OTAs lies... both (...)
HI ALL i hesitated if this issue belong to this section but i will be very happy if some one of u will help me i need to create sigma delta modulator for some application. there is any section in the modulator that named noise shaping - it means that after oversampling signal we make integrator loops to the quantization noise and move (...)
Sinusoidal is ideal for this application. In this case, a simple solution consists in an oscillator based on two integrating devices (double-intergrator oscillator, DIO). Here, you have two outputs at the same time - with a phase difference of 90 deg. In principle, you have several options: One inverting (Miller-) inte