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Q&A

Posts tagged Analog

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81%
+7 −0
Q&A Technique to reset pulse transformer core quickly

I am analysing a pulse transformer which is required to transfer below communication protocol pulse from primary to the secondary side. The pulse duration is 32 μs and off time available to reset t...

2 answers  ·  posted 5mo ago by kadamrohan16‭  ·  last activity 5mo ago by Andy aka‭

71%
+3 −0
Q&A Thévenins Theorem for Transistor Circuit

I am calculating the base current of transistor Q1. To simplify the circuit equations, I applied the Thévenin's theorem twice and converted V1 and R1, R2 into Vth and Rth as shown in the image. Vt...

2 answers  ·  posted 9mo ago by kadamrohan16‭  ·  last activity 9mo ago by Olin Lathrop‭

Question Analog transistor bjt
75%
+4 −0
Q&A PNP Darlington pair as a current limiter

I am trying to analyse what is controlling the load current in the below Darlington configuration. Is it the base current of transistor Q3 which is controlling current through R14 / emitter curr...

1 answer  ·  posted 12mo ago by kadamrohan16‭  ·  last activity 12mo ago by Olin Lathrop‭

57%
+2 −1
Q&A How building a follower satisfying rather extreme requirements.

What is your best suggestion for building a follower that would ideally satisfy the following spec: frequency: from 100 Hz (or lower) to 1 GHz input signal impedance: 1 Mohm input signal ampli...

1 answer  ·  posted 2y ago by coquelicot‭  ·  edited 2y ago by coquelicot‭

71%
+3 −0
Q&A Is a BJT 3-transistor Wilson mirror faster than a simple mirror?

My question is trying to understand if there is an effect on the switching time, on both turn-on and turn-off, between the following configurations. A mirror set up to switch a current, and there ...

1 answer  ·  posted 2y ago by Pete W‭  ·  last activity 2y ago by Olin Lathrop‭

50%
+1 −1
Q&A What is the role of the differential amplifier in a delta sigma converter?

A differential amplifier amplifies the difference between the two input voltages but suppresses any voltage common to the two inputs. Based on this scheme the differential amplifier is substrac...

1 answer  ·  posted 2y ago by Pacifist‭  ·  edited 2y ago by Olin Lathrop‭

66%
+2 −0
Q&A Bypass Caps and High Frequency Current Return Path

I was watching this video by w2aew on the function of ceramic bypass capacitors, and at 6:00 he states that high-frequency currents take the path of least-impedance and make their way to the power ...

1 answer  ·  posted 2y ago by jm567‭  ·  edited 2y ago by Olin Lathrop‭

71%
+3 −0
Q&A 4-Layer PCB Routing Question

I am designing a 4-layer PCB that has both analog and digital circuitry throughout it. The analog section involves high return currents as well as ADCs sampling the voltage across sense resistors a...

1 answer  ·  posted 2y ago by jm567‭  ·  edited 2y ago by Olin Lathrop‭

66%
+2 −0
Q&A Amplifier compensation with added resistor across opamp input terminals

This application note from Linear Technology discusses oscillations in opamp circuits and some compensation schemes. One method discussed for reducing phase shifts in the loop gain due to the RC ne...

1 answer  ·  posted 2y ago by rpm_2718‭  ·  last activity 2y ago by Olin Lathrop‭

Question Analog op-amp
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+2 −0
Q&A How do I calculate and manipulate the inductance and capacitance of outputs to a connector on a PCB?

I am designing a PCB that has to have class 1 div 1 associated apparatus (only the outputs to the sensor) certification. Essentially, I am using a boost converter to convert the voltage from a lith...

2 answers  ·  posted 2y ago by Hawk2020‭  ·  last activity 2y ago by Andy aka‭

75%
+4 −0
Q&A Chokes, Beads and Inductors in Pi-filters

I have seen pi-filters using chokes, ferrite-beads, and plain inductors as the L-element What are the main differences between them? when use one or other?

1 answer  ·  posted 2y ago by zeke‭  ·  last activity 2y ago by Olin Lathrop‭

Question EMC Pi-Filter Analog

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