# Tag Info

Accepted

• 1,133
Accepted

### Part name of this IC - "LLA#537"

Without knowing any more than what is in the post, like dimensions and surrounding circuitry; It's likely to be an Analog Devices ADP3334ACPZ, High Accuracy, Low IQ, anyCAPÂ® Adjustable Low Dropout ...
• 1,414
Accepted

### Filtering noise with low pass filters

Is it correct to apply superposition and LTI system theory and consider each frequency independently entering the filter or do I mix the two frequencies (f1 f2, f1* 3f2, etc.) and then enter the ...
• 465k

### Why don't we use an integrator as the loop filter of a PLL?

When the PLL has locked the whole system can be regarded as a linearized system. Hence, all rules derived from system theory for feedback loops can be applied. At first, we realize that the "...
• 27.4k

### How to calculate a differential + common mode LPF circuit?

The circuit would be more complicated to analyze if it were not symmetric. But it is symmetric. So that helps simplify a straight-forward analysis, a lot. Here's the schematic with names added. ...
• 11.2k
Accepted

### Pi-Filter Simulations Comparison

You need to use Wurth's SPICE models, however, the peak response I get using Wurth's models is different from the Wurth modeler. Perhaps Wurth has better models for their modeler. The general form of ...
• 10.3k
1 vote
Accepted

### Why don't we use an integrator as the loop filter of a PLL?

The VCO frequency to phase function is an integrator. An integrator has exactly 90 degrees phase shift. If we simply added another plain integrator, then we would have 180 degrees phase shift. That ...
• 169k
1 vote
Accepted

### Filter on SEPIC architecture output for making +/- 60 V from 11 V input

I see you've already accepted an answer, but there's a detail missing. the positive voltage is fed back to the feedback pin. Assuming proper regulation, this will never exceed the feedback voltage of ...
• 153
1 vote

### Filter on SEPIC architecture output for making +/- 60 V from 11 V input

I want to know what is the role of R4 and R10 in this circuit? They are there to provide a light load when no real load is connected. If you didn't have these resistors and you disconnected your load,...
• 465k
1 vote

### Active Bandpass with "Tunable" F Using Potentiometer

For some pots, like the common through-panel ones, you can just buy 2 double ganged pots, one for each range, and then bend back the tabs which hold them together and swap the one "plate" ...
• 93
1 vote
Accepted

### Active Bandpass with "Tunable" F Using Potentiometer

As the two caps are equal in value exchange caps for resistors and resistors for caps to be able to use a dual pot to set the center frequency. Frequency response with the resistors decreasing from ...
• 651
1 vote
Accepted

### capacitive filtering of power line transients without power loss

Well, without any detail of what device is in question, or applicable patents if any, there are two typical possibilities. First, consider the equivalent circuit used to test surge: simulate this ...
• 39.6k
1 vote

### capacitive filtering of power line transients without power loss

An ideal capacitor is has only reactance and no resistance. So the ideal capacitor is only an energy storage device, rather than energy dissipative. So when considering "active power" (aka &...
• 335
1 vote

### Second order low pass filter cut off frequency calculation

Plugging those 5 resistor and capacitor values into an MFB opamp circuit calculator shows the frequency is 10.582 kHz. It seems to end up at the same cutoff you calculated. The comment written on the ...
• 159k
1 vote

### Coupling LNA and Band-Pass Filter Properly

Mini-Circuits provides S-parameters for both components which makes it easy to find out how both behave when cascaded. Between the amplifier and the bandpass filter I chose to insert a small ~2dB ...
• 651
1 vote
Accepted

### Coupling LNA and Band-Pass Filter Properly

Is there any practical tips to select the capacitance so that the filter's specified response could be maintained as much as possible, assuming that the load is properly coupled to the output port of ...
• 465k

Only top scored, non community-wiki answers of a minimum length are eligible