Questions tagged [mirror]

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PCB antenna: ground plane layers and dimensions (2)?

This question - sequel of PCB antenna: ground plane layers and dimensions?, talking about an IFA: The only dimension that really matters is the length/width of the ground plane, or parallel to the ...
• 798
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How to see benefit effect of BJT current mirror in the load?

I don't arrive to see benefit effect of BJT current mirror in the load. I would get twice ic (ic1+ic2 = 3mA) with the same sources (both with phasing =0). But here I(RL) = -29µA. link Origin diagram :...
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0 answers
71 views

Gmo2 from vout about differential amplificator

I'd like to know if this demostration is correct to calculate Gmo2 from vout about differential amplificator from this diagram : 1 : Gmo transconductance about Common Base configuration 2 : Gmo1 ...
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1 answer
49 views

Equivalent resistance problem on cascode mirror circuit

I'm trying to analyze the cascode mirror, specifically its sensitivity to VCC variations. Before facing with complicated calculations with the equivalent circuit, the tutorial (I'm following) ...
• 143
1 vote
2 answers
192 views

Questions about cascode current mirror with MOSFETs

I have some queries related to this circuit: Is there any way where we can implement it with non-matched MOS transistors? If not, how do you calculate the I_output and I_ref relationship? I am ...
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5 answers
364 views

Basic BJT current mirror : ... so the collector-base voltage of Q2 is also zero?

From this schema I don't understand this sentence from here, particulary in section "Basic BJT current mirror" "...If Q1 and Q2 are matched, that is, have substantially the same device ...
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1 answer
81 views

Cables on LED mirror

I have bought an LED mirror that is powered by a battery. Unfortunately, it didn't work after charging the battery and I tried to see if the cables were joined correctly. I was too dumb to take a ...
• 101
1 vote
2 answers
539 views

Necessity of a current mirror circuit - MOSFET/BJT?

I am studying the current mirror circuit. I already went through similar questions and answers on this forum. But I was unable to get clarity from the answers. I am just a beginner. I request if you ...
• 123
2 votes
1 answer
683 views

Current mirror with a load

Every book I read explains the current mirror (two transistors, M1 and M2, of which one, M1, is diode connected) neglecting channel modulation. In this way, we get a current Iout = a * Iref where ...
• 596
1 vote
2 answers
502 views

Mirror PCB only, not the whole page when plotting as HPGL with KiCad

It's easier to place the PCB near the origin when using a pen plotter to draw it. However, when I plot a mirrored PCB with pcbnew, it also changes the PCB position (it mirrors the whole page). So, ...
• 121
1 vote
2 answers
2k views

I designed a PCB in Fritzing, but forgot to mirror it. How do I fix it?

I designed my first PCB in Fritzing, intending to have it milled at the local hackerspace (they want Gerber files) and then assemble it with THT components. But now all the copper is on the top side (...
• 21
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2 answers
4k views

capacitive switch behind a mirror (silver backing)

I am new to this field, and I would like to DIY a mirror with a hidden capacitive \inductive touch sensor behind it, once touched it will turn on a 12V LED light. I have bought a capacitive switch ...
4 votes
1 answer
2k views

How can I mirror a group of components and wires across a line in eagle, without having it switch board sides?

I want to design a board that is symmetrical - I have designed the left side, and now I want to copy the components and wires to the right side such that it is "mirrored" across the center line - what ...
• 531
2 votes
1 answer
2k views

Nyquist frequency mirroring

I need someone to check my understanding of Nyquist frequency. I understand it in the following manner. $$F_{nyquist} = ( F_{sampling}/2 ) * n$$ where n is an integer (negative and positive). For ...
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1 vote
1 answer
562 views

Cascode Current Mirror 2Vt + 2Von

I've been spending a lot of time trying to know why the gate voltage of M2 is 2Vt + 2Von. I know that if all transistors have the same characteristics then all the Vgs = Vt + Von. Can somebody explain ...
• 47
2 votes
4 answers
1k views

Current source or current mirror?

I've been told that using current sources in simulation programs may produce "too optimistic" results compared to using current mirrors. Could someone please elaborate? I'm still a bit confused about ...
1 vote
0 answers
226 views

Problem with DAC with current mirrors

I'm trying to design curent steering DAC with binary weighted inputs - I'm using M4, M5, M6, M7 to copy the reference current flowing in M8 with coefficients of 1,2,4,8. The idea is to put either 0 or ...
• 11
1 vote
2 answers
373 views

Problems driving electromagnetic mirror

EDIT: The question was completely edited because the major problem - overloading - was solved. One of the units in the OpAmp was damaged, so it was malfunctioning when connected to the load. ...
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