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Circuit Name and explication
Circuit Name and explication
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Old 2nd June 2013, 12:28 PM   #1
Algar_emi is offline Algar_emi  Canada
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Circuit Name and explication
Default Circuit Name and explication

Hi. Can someone explain to me this FET circuit configuration? I guest it is a form of current source, does it have a name? I think Q1 is selected for the needed current. Q1 can be 2SK170 and Q2 can be 2SK246 for example.

Any help appreciated. Thanks.
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Old 2nd June 2013, 03:52 PM   #2
DUG is offline DUG  Canada
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Q1 / R3 sets the current...remains at a fairly constant Vds

Q3 dissipates the power...may vary significantly (depends on rest of circuit)

More stable set point

IMHO

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Old 2nd June 2013, 05:21 PM   #3
SY is offline SY  United States
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Circuit Name and explication
Much of the context is missing, but it sure looks like a cascode to me.
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Old 2nd June 2013, 09:01 PM   #4
DUG is offline DUG  Canada
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Yes, too much missing really...I thought it was a current source but it does not have to be that.
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Old 2nd June 2013, 11:26 PM   #5
Algar_emi is offline Algar_emi  Canada
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Circuit Name and explication
Here more background to judge the function of the circuit.
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Old 2nd June 2013, 11:28 PM   #6
SY is offline SY  United States
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Circuit Name and explication
Yes, cascode.
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Old 3rd June 2013, 01:46 AM   #7
DUG is offline DUG  Canada
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Yes, cascode.

Current stability and reduction of frequency limitations due to Miller Effect.

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