johna
Newbie level 4
Hello,
I have what is a really basic question.
I am working with an Voltage Controlled Amplifier which states the following about its control ports (ports 2 and 3):
Hopefully this quote is sufficient context. If not, the datasheet us here (reference page page 8 under "Control Port Drive Impedance"):
My plan was to feed one of the control ports with the output of a voltage divider that brings the voltage down to a maximum that the control port of the VCA will accept.
So my questions are:
If I make a connection from the output of my voltage divider to the control port, is my impedance effectively zero? Of course, ignoring impedance introduced by the connection.
Assuming the answer to the above is true, would a way of introducing impedance (which I do not want to do in this case) be to add a resistor in series between the output of the voltage divider and the control port?
My concern is that in order to calculate the impedance feeding the control port I need to do calculations on everything that leads up to the voltage out of the voltage divider.
Thanks,
John
I have what is a really basic question.
I am working with an Voltage Controlled Amplifier which states the following about its control ports (ports 2 and 3):
The 2180 Series VCAs are designed to be
operated with zero source impedance at pins 2 and
3, and an infinite source impedance at pin 4. (pin 4
should be left open.) To realize all the performance
designed into a 2180, keep the source impedance of
the control voltage driver well under 50 Ω.
operated with zero source impedance at pins 2 and
3, and an infinite source impedance at pin 4. (pin 4
should be left open.) To realize all the performance
designed into a 2180, keep the source impedance of
the control voltage driver well under 50 Ω.
Hopefully this quote is sufficient context. If not, the datasheet us here (reference page page 8 under "Control Port Drive Impedance"):
My plan was to feed one of the control ports with the output of a voltage divider that brings the voltage down to a maximum that the control port of the VCA will accept.
So my questions are:
If I make a connection from the output of my voltage divider to the control port, is my impedance effectively zero? Of course, ignoring impedance introduced by the connection.
Assuming the answer to the above is true, would a way of introducing impedance (which I do not want to do in this case) be to add a resistor in series between the output of the voltage divider and the control port?
My concern is that in order to calculate the impedance feeding the control port I need to do calculations on everything that leads up to the voltage out of the voltage divider.
Thanks,
John