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Old Yesterday, 02:58 PM   #151
MorbidFractal is offline MorbidFractal
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Default Gain Peaking in an I to V converter.

Some words to the thoughts.

I had mentioned the possibility and that was based on something in the back of my head mentioned somewhere else.

Picture 1) Classic I to V converter circuit.

The input current source represents the photo-diode.

Picture 2) Classic I to V converter with diode capacitance.

Voltage gain is RF/RIN.... Guess What?

Picture 3) Adding input resistance to tame things.

Without thinking harder, flying in the fog, I have no idea what the trade offs might be.

Oh.. your new .asy looks like the old .asy but you might see from my circuits that I have being messing about with the .asy to get pretty circuits. Right click, open symbol, mess about and save.
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Old Yesterday, 03:04 PM   #152
MorbidFractal is offline MorbidFractal
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Quote:
Originally Posted by jan.didden View Post
MF, the I(B1) graph rises at frequency, is that not the LED input cap at work?

Jan
B1 is a behavioural current source whose output current is set to follow the current in V1. The load on V1 is set to increase current drawn and cancel the effects of diode, LED/Photo, capacitance.
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Old Yesterday, 03:23 PM   #153
Mooly is offline Mooly  United Kingdom
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Op amp Linear power supply
And to think this all started with,

"I have a 741 and series pass transistor......"

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Old Yesterday, 06:03 PM   #154
jan.didden is offline jan.didden  Europe
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Quote:
Originally Posted by MorbidFractal View Post

Oh.. your new .asy looks like the old .asy but you might see from my circuits that I have being messing about with the .asy to get pretty circuits. Right click, open symbol, mess about and save.
Hmmm. How about this?
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Old Yesterday, 06:06 PM   #155
jan.didden is offline jan.didden  Europe
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Quote:
Originally Posted by MorbidFractal View Post
B1 is a behavioural current source whose output current is set to follow the current in V1. The load on V1 is set to increase current drawn and cancel the effects of diode, LED/Photo, capacitance.
Right. Got it.

Jan
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Old Yesterday, 07:22 PM   #156
jan.didden is offline jan.didden  Europe
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Like so.
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