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Old 10th August 2005, 10:45 PM   #1
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Default Advanced Solid State Amp

Hi everyone, what do you think of the attached little beauty, feel free to comment, especially on how i can improve the circuit with
design details

thanks guys, you're all awesome!

cheers
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Old 10th August 2005, 11:28 PM   #2
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WOW any values for us?

\Jens
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Old 10th August 2005, 11:39 PM   #3
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Hi Mastertech,

Nice circuit, but its a regular standard circuit not an advanced one i think..

You should implement emmiter degeneration resistors both at differential transistors and current mirror also. This should improve the circuit alot...
Apply your precisionist brains to get rid of capacitor in the feedback path direct couple the feedback as in high -end amps...
insert a cascode loaded differential stage to help you achieve better CMRR at high frequencies...
Try to use Deep emmiter follower stage at the output, if you really want good damping and reasonable current gain....

best regards,
K a n w a r
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Old 11th August 2005, 12:01 AM   #4
AKSA is offline AKSA  Australia
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Looks very conventional to me.

It will work well, be absolutely reliable, and as long as it is dimensioned properly, measure very well.

It will sound accurate, have good bass, and offer excellent rail efficiency.

Cheers,

Hugh
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Old 11th August 2005, 12:08 AM   #5
Eva is offline Eva  Spain
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Nice joke.
I'm not sure about the ironic point, though.
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Old 11th August 2005, 12:32 AM   #6
sam9 is offline sam9  United States
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As already said, it looks pretty conventional and with the right values should work fine. If it were mine, I would add two pole compensation, but that's just my personal eccentricity.

One question though. Do the diodes in the rails really accomplish much? This isn't retorical, I'm curious. The purpose is obvious (I think), but has anyone ever measured with vs. without?
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Old 11th August 2005, 02:37 AM   #7
thanh is offline thanh  Viet Nam
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Quote:
insert a cascode loaded differential stage to help you achieve better CMRR at high frequencies...
Hi WorkHorse ! Why ? Thanks

Hi mastertech ! If current mirror is use as a load at a input stage , Vas will often be a Darlington common emitter .Can your schematic work well
Thanks!
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Old 11th August 2005, 02:48 AM   #8
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george u got the date wrong its only august
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Old 11th August 2005, 02:57 AM   #9
Duo is offline Duo  Canada
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Lol, this design looks rather conventional, as others have said.

One point about the diodes in the rails though: When the output stage pulls the rails to droop, the diodes stop conducting and the capacitors on the other side mantain the gainstage supply voltage at a more constant value regardless of heavy output loading. This should help the paramaters stay still during heavy load conditions I should imagine.
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Old 11th August 2005, 03:16 AM   #10
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Quote:
Originally posted by thanh

Hi WorkHorse ! Why ? Thanks
Hi Thanh
A cascode-connected
input circuit provides superior performance to the more common differential amplifier in the following areas:
Better high-frequency response
Increased high-frequency input impedance (the cascode connection eliminates the input transistor
Miller effect caused by the collector-to-base capacitance (Cob)]
Superior power-supply noise rejection along with greater CMRR.
Because of their high output impedance, cascode-connected input differential amplifiers are
excellent voltage-to-current converters. If the circuit topology takes full advantage of the differential
input stage, the amplifier power-supply rejection ratio can easily exceed 120 dB.

regards,
K a n w a r
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