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life speed

Fri, Feb 19, 2010 7:05 PM

Any opinions on the suitability of the TI OPA820 as a 10 MHz distribution amp? The voltage noise is only 7 nV/rtHz @ 100 Hz (gain=2, I'll be using g=1), which is the best I've seen so far for a wideband amp. Not as good as the discrete transistor circuit, but it would use alot fewer parts. It only needs to be better than a 'good' OCXO.

Clay

Any opinions on the suitability of the TI OPA820 as a 10 MHz distribution amp? The voltage noise is only 7 nV/rtHz @ 100 Hz (gain=2, I'll be using g=1), which is the best I've seen so far for a wideband amp. Not as good as the discrete transistor circuit, but it would use alot fewer parts. It only needs to be better than a 'good' OCXO. Clay

BC

Bob Camp

Fri, Feb 19, 2010 7:30 PM

Hi

As previously mentioned, these gizmos seem to all be spec'd out at 2V p-p
into 100 or 200 ohms. The only way to figure out what happens past that is
going to be to get one and see.

Bob

-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of life speed
Sent: Friday, February 19, 2010 2:06 PM
To: time-nuts@febo.com
Subject: Re: [time-nuts] Advice on 10 MHz isolation/distribution

Any opinions on the suitability of the TI OPA820 as a 10 MHz distribution
amp? The voltage noise is only 7 nV/rtHz @ 100 Hz (gain=2, I'll be using
g=1), which is the best I've seen so far for a wideband amp. Not as good as
the discrete transistor circuit, but it would use alot fewer parts. It only
needs to be better than a 'good' OCXO.

Clay

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Hi As previously mentioned, these gizmos seem to all be spec'd out at 2V p-p into 100 or 200 ohms. The only way to figure out what happens past that is going to be to get one and see. Bob -----Original Message----- From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On Behalf Of life speed Sent: Friday, February 19, 2010 2:06 PM To: time-nuts@febo.com Subject: Re: [time-nuts] Advice on 10 MHz isolation/distribution Any opinions on the suitability of the TI OPA820 as a 10 MHz distribution amp? The voltage noise is only 7 nV/rtHz @ 100 Hz (gain=2, I'll be using g=1), which is the best I've seen so far for a wideband amp. Not as good as the discrete transistor circuit, but it would use alot fewer parts. It only needs to be better than a 'good' OCXO. Clay _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

PR

Pete Rawson

Fri, Feb 19, 2010 8:35 PM

Clay,

Analog devices AD4899-1 voltage noise = 2nV/rtHz @ 10Hz; GBW = 300MHz.

Pete Rawson

On Feb 19, 2010, at 12:05 PM, life speed wrote:

Any opinions on the suitability of the TI OPA820 as a 10 MHz distribution amp? The voltage noise is only 7 nV/rtHz @ 100 Hz (gain=2, I'll be using g=1), which is the best I've seen so far for a wideband amp. Not as good as the discrete transistor circuit, but it would use alot fewer parts. It only needs to be better than a 'good' OCXO.

Clay

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Clay, Analog devices AD4899-1 voltage noise = 2nV/rtHz @ 10Hz; GBW = 300MHz. Pete Rawson On Feb 19, 2010, at 12:05 PM, life speed wrote: > Any opinions on the suitability of the TI OPA820 as a 10 MHz distribution amp? The voltage noise is only 7 nV/rtHz @ 100 Hz (gain=2, I'll be using g=1), which is the best I've seen so far for a wideband amp. Not as good as the discrete transistor circuit, but it would use alot fewer parts. It only needs to be better than a 'good' OCXO. > > Clay > > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there.

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Re: [time-nuts] Advice on 10 MHz isolation/distribution