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137 Threads found on Filter Constant
A general guideline is to select values that will match the impedance through which the filter will act, at the design frequency. A large capacitor tends to be associated with: higher time constant slower frequency lower impedance greater current A high Henry value tends to be associated with: higher time constant slower frequency higher (...)
Hey guys, I have just started reading some stuff about mixers and tried to implement a down converter, but I tried to simulate a system level before getting to circuit design. But I got some results and at least to me they are not correct. Some snapshots of my design in Matlab are attached. frequency of both input and local oscialtor (LO) is 10k
The 5880 substrate is PTFE with a thin glass matrix. It is soft, and to have grounding vias, requires a special sodium etch before plating. The loss tangent is 0.0009 at 10 GHz. There are many other RT Duroids that use part ceramic loading, still have low loss, are dimensionally stable, and can be etched and plated with conventional PCB techniqu
Hi, I have to implement an adaptive equalizer using the LMS Algorithm in VHDL. I don't have a training sequence so I have to use the CMA (constant Modulus Algorithm) for the filter coefficients to converge. I have a 3-tap FFE and an 8-tap DFE. However, the problem is the coefficients do not converge to a stable value. If
the problem is that the filter following the rectifier does not draw a resistive load from the transformer. so the VA requirement is a variable that depends on several factors, also, if the load is not constant you can take advantage of the thermal time constant of the transformer as well. for a choke input filter (...)
i want to do channel estimation using kalman filter. this is the matlab code i formulated using the equations. the noise added is gaussian. but the problem is that i am getting a constant error instead of error getting reduced with the number of iterations. can anyone please help me to find the correction needed in this... its urgent..if anyone ca
Hi.. i'm currently designing LPF using stepped impedance that operate at 9.4 GHz and also i want my LPF have constant 90 phase shift at 9.4 GHz so after i have the L-C value, i transform it to microstrip with dielectric constant (εr) = 2.33 dielectric thickness (h) = 0.787 mm and Zlow = 10 Ω Zhi = 110 Ω so when i
I have a real time signal, a new sample is coming continuously and needs to be filtered before further processing. I want to design the filter in C. But I don't have much experience in C. Could someone give an simple example of C-code so that I can go further. e.g., I need to filter the real time signal with a low pass (...)
Supplementing godfreyl's intuitive analysis, it should be clear that other than said, R3 is of course affecting the filter characteristic as it forms a time constant with C2. You'll recognize a basic similarity of the circuit with a MFB bandpass filter. But I fear, there's no inituitive way to determine the component values for an (...)
Yes you can, it have a normal DC decoupling and a synthetic Lattice balun consisting of a LC and CL circuit. By adjusting L/C ratio of the balun is also impedance ratio adjusted. Keep phase shift constant +/- 90 degree. In the TI example is also a low pass filter following the
You can use PWM for pulsed charging to get a lower average charging current. By adding a filter at the PWM output, you can get a pure DC for charging the battery. By varying the duty cycle, you can vary the voltage and thus constant charging current.
Linear phase is in fact a well defined term (other than phase change). Strictly spoken, only FIR filter with symmetrical impulse response expose linear phase (respectively constant group delay). CIC decimators belong to this class of FIR filters.
The frequency of the input signal 2/T is very high for the ripple to become visible or the RC constant is too large. If you continue to increase the frequency, the output will tend to be exactly 2.5V. That is because the only surviving component of the input square signal's spectrum passing through the RC filter is the DC.
abs is quite right. If you use IF, you can build one constant frequency high-Q IF filter, if you want to use direct conversion, you should design variable frequency high-Q filter, it supposed to be much more complicated design.
I am building a H-bridge DC-AC inverter to test the efficiency of new now need to design the actual input filter/capacitor. I know this is required in order to remove the harsh current/voltage spikes that the power supply won't be able to handle. But how do I go about defining values? I k
The RMS measurement problem has been already discussed in a similar thread. RMS is an average quantity, you need to define the integration intervall respectively filter time constant for it. For power consumption, a long averaging time would be suggested anyway. If you don't have a real power m
The function is called f/V-converter, ICs like LM2907 can be used for it. Or simply convert the input pulses to pulses of constant width by a monoflop and average the output pulses in a low-pass filter to get a frequency proportional voltage.
Hello- I have an RC low-pass single order filter. R = 40k C = 10uF The 3db point I'm filtering at is 1/2*pi*R*C = 0.4 Hz The RC time constant is R*C = 0.4 Does this mean that there will be a 0.4 second delay between my input signal and output signal? Thank you, N_N
hi guys, i wanted to design parallel coupled filter. i having trouble in calculating the width and the saparation between two strip line. Obtained: Dielectric constant ,er= 3 Dielectric hight=1.5 mm appreciate your help. thanks
Yep, same frequency spacing, but different levels. From FM theory, your modulation rate is constant (1 MHz) but the actual frequency deviation is changing at the different harmonics. 60 dBc spurs aren't bad, but if you want to reduce them more, you might get away with adding an elliplitcal lowpass filter with a notch at 1 MHz at the VCO tune po