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Subject: Re: Need circuit/idea for composite video splitter

Date: 01/11/01 at 8:48 PM
Posted by: cm
E-mail: tancming@yahoo.com
Message Posted:

In Reply to: Re: Need circuit/idea for composite video splitter posted by Titel on 01/10/01 at 12:58 AM:

Just as eager to know the solution to the subject above, perhaps somebody would shed some light as to whether using a common base amplifier to amplify the A/V signal prior to connection to the TV might help.

Reason of using the common base amplifier is to achieve a wider band amplification characteristics so as to cover the full range of video composite signals from DC to at least 20MHz before rolling off(would appreciate if someone could tell up to what frequency range the A/V composite signal covers). CB amplifiers with an emitter follower eliminates the miller effect said to cause an early signal frequency rolloff. As a high impedance output amplifier with no phase shift the CB amp requires a buffer amp to prevent loading effects when connecting to the TV of 75ohms.

- CM

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