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Subject: Output impedance seen as a input impedance

Date: 09/29/03 at 9:25 AM
Posted by: bronstein
E-mail: cafenoir[AT55]lycos.es (replace [AT55] with @ to reply)
Message Posted:

hello, i want to design a circuit to transmit and receive signal; it will be connected to a transmission line; in order to transmit i use an operational amplifier with a 50 ohm serial resitor next to the output to match impedances; as a receiver i use another operational amplifier; the question is how the transmit path affects the receiver one in terms of impedance? is the output of the first amplifier an open circuit for the channel? is the serial resistor in the transmit path the impedance which match the receiver path to the channel or i need another paralel resistor in the input of the operational amplifier of the reception path?
Thanks in advance

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