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7 votes
Accepted

Part name of this IC - Analog Devices, 8-pin, "S 6B" A 06" "C 42"

Marking "S6B" : ADG721BRM Marking "A06" : AD8629ARMZ Marking "C42" : AD7787BRMZ pictures from LCSC:
vivier's user avatar
  • 1,133
4 votes
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, anyCAP® Adjustable Low Dropout ...
MrGerber's user avatar
  • 1,414
4 votes
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 ...
Andy aka's user avatar
  • 465k
3 votes

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 "...
LvW's user avatar
  • 27.4k
3 votes

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. ...
periblepsis's user avatar
  • 11.2k
3 votes
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 ...
qrk's user avatar
  • 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 ...
Neil_UK's user avatar
  • 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 ...
rohmeooo's user avatar
  • 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,...
Andy aka's user avatar
  • 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" ...
kingtaco's user avatar
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 ...
Raonoke's user avatar
  • 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 ...
Tim Williams's user avatar
  • 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 &...
BK303's user avatar
  • 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 ...
Justme's user avatar
  • 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 ...
Raonoke's user avatar
  • 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 ...
Andy aka's user avatar
  • 465k

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