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Class A headphone amplifier
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Old 18th July 2003, 11:44 AM   #21
jcx is online now jcx  United States
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Join Date: Feb 2003
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G1 is a voltage controlled current source, in this circuit it is standing in for the entire differential transistor front end of the amplifier the differential voltage at the +/- terminals of G1 controls the current source output

the G1 circuit function is an idealization of the diff front end with current mirror, the gain of 0.01 A/V corresponds to 1/(100 Ohm), or about the same Gm as a diff pair with 100 Ohm emitter degeneration resistors

i'm using G1 to save the 4-5 Qs that make up a the front end because orcad demo is limited to 10 transistors - also it lets you concentrate on the VAS + Output properties and sims faster

it turns out that real diff pairs are so good that replacing them with the ideal G1 block doesn't change circuit operation much - the main limitation here is that the Super Pair input impedance is so high that the ouput impedance of the current mirrored diff pair @ > 1 MOhm and < 5 pF would lower circuit gain a little
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Old 16th February 2013, 12:29 PM   #22
Jenyok is offline Jenyok  Russian Federation
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Join Date: May 2012
Location: Russia, Moscow
Output (m)W on 32 Ohm load with power +-15 Volts ?
Output (m)W on 300 Ohm load with power +-15 Volts ?
Total Harmonic distortion ?
Total IM distortion ?
Total noise floor ?
Input impedance, Ohm ?
Output impedance, Ohm ?
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