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surianova
Joined: 01 Sep 2004
Posts: 399
Helped: 20
Location: ASIA
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 03 Oct 2008 12:17 ground bounce |
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hi
can high output impedance at the tail transistor of the differential amplifier reduce ground bounce?
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A.Anand Srinivasan
Joined: 15 Oct 2005
Posts: 1769
Helped: 213
Location: India
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| 06 Oct 2008 5:27 ground bounce |
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| ground bounce is related to the inductance present in the wire to the ground... i dont think the output imp of tail transistor of diff amp can do anything about it...
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saro_k_82
Joined: 17 May 2007
Posts: 84
Helped: 14
Location: India
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| 06 Oct 2008 5:45 Re: ground bounce |
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Striving for high output impedance to fight against ground bounce won't be a clever idea. That may give you a good dc PSRR, but at the frequencies where ground bounce becomes an issue, the PSRR will be very poor.
1. Reduce the inductance of the supply current loop. Examine the current path and make the supply and ground currents move close to each other.
2. Reduce the rate at which your block consumes power (don't have sharper rise/fall times in your digital block).
3. Have the decoupling caps very close to the high frequency block.
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