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Rogers Corp has a good paper on this. Keep in mind any answer has many assumptions (temperature, copper thickness, etc). GE
Direct temperature and pressure controller Hope it is helpful to you
Prolonged exposure to direct sunlight can certainly permanently degraded several components of the LCD, including the polarizing filter and clouding of some layers. LCDs are also very susceptible to changes in temperature, especially to prolonged exposure to high temperatures found in direct sunlight. Such prolonged exposures to high (...)
Hi, we can not answer this. IF input signal is DC it NEVER changes. But i´m sure it does. And you have to decide what changes in value up to what frequency you want to see, and what frequency makes no sense. You could either decide in frequency or timeconstant. If you want to measure room temperature you maybe want to see changes with a time c
I would use a MCP9701 or MCP9701A from Microchip. They are inexpensive, cover the temperature range you want with sufficient accuracy and best of all, produce an analog output voltage which is already scaled to suit a standard ADC. They can also drive large capacitances so you can easily filter out any noise picked up on the cables. I use them in
NPO (Negative-Positive-Zero) refers to the capacitor's ability to avoid a change in value with temperature. Silver mica capacitors have low resistive and inductive losses (high Q-factor), and also their properties are pretty independent from frequency. So, silver mica capacitors are better for filter design, when both, NPO capacitors and silver m
At first Fn ( or T, equivalent noise temperature ) and linearity. Linearity that is input P1 IP3 and as function FEM dynamic range. Mirror channel selectivity if necessary performances of the preselector filter. And third all kind in and out unwanted channels and emissions. It is very briefly.
So you need a noise rejection filter and you have a sampling rate which has a maximal signal bandwidth that can exceed the Shannon sampling theorem rate. But you are only interested in real-time rate changes of temperature but know that phase shift with filtering causes time delay or group delay. Can you model a
Hello, I am working on a project to construct a low cost Radio Interferometer with a student organization at my university. Our plan is to construct several nodes of antennae, where each node is be responsible for controlling a group of antennae (point position, amplifier temperature, amplifier gain, filter selection, LO frequency, etc.) as well
I read this somewhere and saved it. How to implement a simple single pole digital filter. It works great and I now use it all the time. Many systems use an ADC to sample analog data that temperature and pressure sensors produce. Sometimes, system noise or other factors cause the otherwise slowly fluctuating data to "jump around." To r
Ceramic capacitors are cheap and nasty, they have a wide tolerance, bad temperature coefficient but are cheap and have low self inductance so they are suitable for very high frequencies. Frank
In practice, you often won't be able to fulfill the criterion of < 1% parameter error compared to an ideal OP. It's completely illusional for active filters in the higher MHz range and not necessarily reasonable even for audio filters. If the used OP has stable GBW over temperature and not much type variation, designing the (...)
Hi, I need to detect the "DC offset level" from the signal and "four stage band pass filter". I am trying to measuring the Fluorescence decay time which is come from the Fiber optic thermometer. I am driving the LED by square pulse, then the square pulse is changed depending on the temperature and the signal behaves like exponential curve. Bu
Hi, I need to detect the "DC offset level" from the signal and "four stage band pass filter". I am trying to measuring the Fluorescence decay time which is come from the Fiber optic thermometer. I am driving the LED by square pulse, then the square pulse is changed depending on the temperature and the signal behaves like exponential curve. Bu
Hi, I need to detect the "DC offset level" from the signal and "four stage band pass filter". I am trying to measuring the Fluorescence decay time which is come from the Fiber optic thermometer. I am driving the LED by square pulse, then the square pulse is changed depending on the temperature and the signal behaves like exponential curve. B
All of them (PIP, MOS cap, MOM, MIM ) might be used for active filter. However, for the best choice, you must consider voltage coefficient, temperature coefficient, matching and substrate noise.
0.1? resolution is not the problem, but accuracy ?0.1? over -40? to 140? is. I don't think you'll be able to get anything close to that without using Pt sensors. Even with Pt sensors it is challenging to design accurate system. Using some specialized IC's for this purpose might help. Actually you can make 0.01 d
Hello all, I permit to "re"post and try again to explain my problem : I use a IR sensor that provides a voltage response on the output. This output is pertubate by a regulation loop from a compressor (temperature regulation with a diode placed in the sensor). A sort of “glitch” is present on the output of the sensor (come from the
Hello I use a IR sensor that provide a voltage response on the output. This output is pertubate by a regulation loop from a compressor (temperature regulation with a diode placed in the sensor). A sort of “glitch” is present on the output of the sensor (come from the PWM command of the compressor motor). The bandwidth of the sensor is
Hi all, I'm using a PTAT current source to compensate the temperature dependence of my OTA-C filter. I was able to get Current proportional to temperature but the problem I'm facing is, the variation over process corners is too much. Is there any way I can design a PTAT current source that doesn't (or vary less) with process, prefarably (...)
Hi dears, I'd like to design an LNB that can be used for Total power radiometer by connect the LNB with square-law detector and low-pass filter in series. The radiometer will be used to detect hot spots "high temperature". I need your help to find a way to simulate like this system. My problem starts that how can I find a model to realize a ther
Accurate filters are not constructed with LC elements at that frequency due to their tolerances,standard values,temperature effects and non-ideal models.. Also, board and its prasitic effects will shift the filter characteristics. You can build a microstrip filters on a PCB boad by EM simulating and then doing optimization.
Hi, I'm trying to read temperature with a thermocouple for which i have made a amplifying circuit after which i feed the amplified voltage to a Low-pass filter to remove any noise. To be very frank i don't know how to design a LPF but after seeing from some applications i have used one which i have shown in attached diagram. This LPF is itself intr
As I understand is that the reference circuit indicating that 1/RC is lower than your reference clock frequency. But the change on the filter circuit is that the bandwidth is set to higher frequencies. This is correct! If you verify both, the reference tuner and the filter and apply the same process/temperature depend RC, the (...)
Dear cavity filter experts, Please discuss the soltions to improve the stability over temperature varying. Are there some commonly used solutions? thanks y99lx
I want to use a coaxial resonator as the IF filter at 500MHz. The resonator will be made of copper, with no special treatment, maybe not even silver plating. What selectivity can be expected from this? The frequency stability on the long term and with temperature variation of 10-40°C is good enough for an IF filter, or it needs to be (...)
Well I can give one example for you ... you have to understand mixing and intermediate frequencies to get it: I've just worked on a project where we used a magnetron as a source. The frequency drifts with temperature changes. The source is mixed a few times and filtered (A SAW filter, very high Q). If the source drifts too much then (...)
filter transfer characteristics depend allso on resistor parasitics. First of all it is series inductance and second parallel capacitance. Other resistor parameters have influence on filter stability over temperature, time etc. I think your main task is not filter design but study of different resistor type properties.
Hi, all: I design tuning circuits for gm-c filter to compensate the gm's variation due to process,temperature and aging. My reference is form the book"Wireless.Communication.Circuits.And.Systems", and details in accessories. But I have some questions below,please help me check them. 1.The Gm cell in the ?Tuning circuits? (accessor
Many systems use an ADC to sample analog data that temperature and pressure sensors produce. Sometimes, system noise or other factors cause the otherwise slowly fluctuating data to "jump around." To reduce higher frequency noise, designers often install an analog RC (resistor-capacitor) lowpass filter between the sensor and the analog-to-digital-
Surely these low frequency noise comes from two reason: 1: 1/f noise 2: envromental noise(temperature drift, vibration, etc) you need a high pass filter to filter this low frequency noise
Hi, I require a filter to be implemented in 'C' language. The input signal is a DC which can vary with respect to environment like temperature. I do not have any information on the noise except for 50/60 Hz noise. I want to know which type of digital filter is most suitable for my application. Please suggest. Regards, vhn
Diel const of FR4 can vary from 4.3-4.8 from batch to batch. And is temperature sensitive as well. Loss Tangent can vary between 0.018-0.030, depending on number of layers, board thickness, etc. Using FR4 as substrate for microwave filters, requires accurate tolerance analyses of the FR4 parameters in a microwave design program, to predict spre
hi... I have two question to the pic18f452 experts.. 1- I'm working on a project about temperature PID controller using PIC18f452 and I'm asking if anybody work on a such project to give some tips and if possible the c algorithm for the pid controller? 2- my second question is about the microcontroller analog output .How can I gener
anybody knows where can i buy such an crystal filter. f0:10MHz BW:10KHz loss:3dB(max) ripple:1dB(max) stopband rejection:20dB(+-20K) operate temperature: -20~+55 thanks!
temperature stability may be an issue at this narrow bandwidth. Usually a frequency conversion to a lower frequency is required prior to narrow band filtering, giving a larger relative bandwidth. For example, at 240 MHz, 12 MHz BW is 5 %. Is it possible to design a combline filter with <.1% BW (e.g. 12 MHz BW @ 12GHz)?
Thomas Hornak et al., "An Image-rejecting mixer and vector filter with 55-db image rejection over process, temperature, and transistor mismatch," JSSC, vol. 36, no. 1, Jan 2001.
If you want to improve temperature stability for coaxial filters, you can use very good and expensive material - invar.
Thank you again, but once more I am not sure if you got actualy my question. I do not want to measure exact noise in a system, I was just wandering if a filter can suppress the out-of-band noise bellow kT. Therefore I choose hypotetical Bs>Bf for the experiment. If the noise can not be suppressed bellow kT than result is kTBs, other
Why people use it in charge pump circuit?? Good response to current transients (during rapid charge/discharge cycles when PLL is locking). Compare PLL settling times if a X7R capacitor is used in a loop filter : slower settling than with film.. Capacitance vs. temperature change is small like C0G. Piezo-electric effect
This reply assumes that you mean a coaxial quarterwave stub filter. In my experience, near full rated power operation, stub filters will arc at the open circuit end in high humidity conditions. If you can get the filter open (try not to disturb the stubs or any coupling components) you should see burn or blast marks on the end of one or (...)
Check for humidity point in the temperature Chamber. High level of humidity can increase the VSWR. regards
Hi all For long time I've used FIR or IIR filters (depend on application) for noise filtering. Last time I've found very interesting article ( ) and there is median filters proposed for temperature noise removal. I am thinking to use median filter in next application. Does anybody have experience to