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137 Threads found on edaboard.com: Filter Constant

Need help on complex coefficient filter design

I need to design a complex coefficient filter to filter the complex value of each subband after filter bank. Can you recommend me any books on that? Thank you very much.

Which circuit can work as this block, thank for ur knowledge

A positive peak detector circuit. A simple rectifier and a small filter capacitor.

Help me design a new FPGA card

hi all, I would like to design a new card with Timing filter Amplier,constant Fraction. Discriminator FPGA, ADC 100Mhz or more if somebody has an idea... Thank's in advance best regards

How to design a new FPGA card?

hi all, I would like to design a new card with Timing filter Amplier, constant Fraction. Discriminator FPGA, ADC 100Mhz or more if somebody has an idea... Thank's in advance best regards

Designing a capacitor-top coupled bandpass filter

Hello I am new here and I hope to get help for my assignment: Question ? Design a Chebyshev three-resonator, capacitor top-coupled, constant-k bandpass filter centered at 1MHz, with 1 dB ripple and a 100kHz, 3 dB bandwidth. The source and load resistors are 1.5kΩ and available inductors have a quality factor of 60. We just

help me with the case where the 1st LO obtains fixed IF

Generally, when channel spacing is constant then LO step can be equal to that spacing. Receiver bandwidth is determined by IF passband. Mixer output is wider than IF filter and can be determined with input filter or can be wideband without this filter. Depending on type of modulation a fine tuning is sometimes needed. So (...)

AWGN and Square root raised cosine

what is the spectral density of AWGN passed the Square root raised cosine filter?

Suggestions on a bleeder resistor

avdrummerboy, The time required to bleed off the capacitor charge depends on the RC time constant. T = RC, Where C is the filter capacitance, R is the resistance, T is the time constant which is the time required for the capacitor voltage to be reduced to approx 37% of its fully charged value. The resistor required to discharge the (...)

very low frequency high pass filter

A simple RC filter will do this, remember if you place a zero at 0 Hz and a pole at 1 Hz you have infinite decades of distance between the two (logarithmic scale) and a single pole filter will slope at 20 db per decade. To have a pole at 1 Hz is not unheard of for a simple RC filter: w = 1/rc = 2*pi*f For example c = 10uF and r = (...)

Help me simulate Hilbert FIR filter in Matlab

Hi I have a problem with Hilbert FIR filter. when I simulate it in MATLAB, it has linear phase except of constant phase. I have tested lot of coefficients untill now, but all of them have linear phase. If it is possible, please solve my problem or send me the coefficients. Regards

Help me design a signal source to generate 50-310 MHz

You can generate this by mixing 2 signal sources, for example a constant 1GHz source and a VCO that covers 1.05GHz - 1.31GHz. Use a good filter at the output. If spectral purity is not a concern, there are ring VCOs that can cover this domain. For VCO, look at MiniCircuits website.

about linear phase filter

bals, A linear phase filter is a filter for which the phase shift is a linear function of frequency. For example, if the phase shift is X degrees at frequency F, then the phase shift will be nX degrees at a frequency of nF. It is possible to achieve exact linear phase with a FIR filter. However, not all FIR filters have (...)

relation btw. Delay of a filter & its Order?

guess you can talk about 2 types of delay. In analog sense, delay for an analog filter is defined in the way already nicely explained by RFCMOS. I think it means that if you were it give a frequency sweep to an constant delay filter (frequency being always within the constant group delay range of the (...)

How to design Voltage tunable filter?

hi everyone I need to design a voltage tunable filter,which has gain,because it contain an amplifier.Its center frequency is from 70MHz to 300MHz.But I have no ideal how to design it.Please give me some informations or books,and which simulation software I can shoose to design?Thanks!!! best regards Kezman

about Filter constant GM ???

GM/C defines the filter design poles. But having constant GM/C instead of constant GM would be a better choice.

How to calculate filter coefficients using filter structure?

Hi filter coefficients are related to cutoff frequency. If it is not constant, simulate it and select one.

Here are few "pet" questions / topics 1. Two stage Op-Amp design 2. Frequency Analysis of single stage amplifiers 3. Design of cascode amplifiers 4. Simple Lowpass high-pass filter cutoff frequency and time constant. 5. Single MOS circuit question ..like dynamic memory etc..

Pass band gain of a low pass butterworth filter.

I got this value from Ramakanta A. gayak ward book is written that in a low pass first order butter worth filter Af=1.586 so Rf=0.586R1. where Rf is the feedback resistor. it is always constant. can u plz help me why this value is always constant???

System that needs PLL to provide a DC power supply

Maybe i think, when a PLL is locked, the tension from filter to VCO is very stable. For example, with a fourth order filter, we have a variation near nV for ns.

Error Amplifier Design

You are sampling the output voltage of the DC-DC converter with a resistive divider? How much capacitance do you have at the input of your amplifier ? This will form a low-pass filter. Your error amplifier will also function as a low-pass filter with gain. Are the two time constants similar ? if not, take the dominant time (...)