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decrease current consumption in BJT Op Amp
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lucky8



Joined: 27 Jan 2005
Posts: 37
Helped: 2
Post03 Feb 2005 9:43   

decrease current consumption in BJT Op Amp
I know that to reduce input current in for CMOS Op Amp, the designer can increase the resistor value or/and increase the output transistors multipliers.

But, how about reducing the current consumption in BJT Op Amp?
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Fom



Joined: 10 Mar 2004
Posts: 778
Helped: 57
Location: Taiwan
Post03 Feb 2005 12:23   

Re: decrease current consumption in BJT Op Amp
Do you worry about current consumption or input current.
For CMOS OP amp input current should be 0.
For bipolar input current has some value. But you can reduce this input current by some circuitry. I met some input current cancelling circuit in Burn-Brown devices.
But what is your question: input current or current consumption?
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lucky8



Joined: 27 Jan 2005
Posts: 37
Helped: 2
Post03 Feb 2005 14:35   

Re: decrease current consumption in BJT Op Amp
sorry, i mean the current consumption.
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cetc1525



Joined: 08 Oct 2004
Posts: 177
Helped: 3
Post06 Feb 2005 3:04   

decrease current consumption in BJT Op Amp
the only way is reduce the mirror's current.using high gain stage .
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