Impedance Match
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Impedance Match
Audio frequency comms splitter impedance matching
I have a splitter transformer with a single multi-tap primary (175 77 98 turns), and two independent secondary coils of 175 turns each.
The transmitter is 600 Ω and connected to the primary, and a 600 Ω receiver is connected to each of the secondaries. (ie two separate 600 Ω receivers)
How many turns on the transformer primary are required to match the loads on both the secondaries?
Do I calculate each reflected secondary load independently, and then calculate the result as two parallel impedances in the primary?
I believe so.
You want 600 reflected in the primary, so that's 1200//1200 for the reflected Z.
To get 1200 reflected in the primary for each 600 ohm load, you would calculate
Zr = N^2.Zs (N is turns ratio primary/secondary)
rearranging and plugging in values to find N:
N = sqrt(1200/600) or 1.414 (ie root 2).
Each secondary winding is 175turns, so the primary should be 175*1.414, or 247 turns, so use the 175 turn and the 77 turn taps in the primary for 252 turns, which will put you close to 600 ohms total reflected load.
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Input impedance matching with fully differential amplifie...
