# Tagged Questions

79 views

### Derivation of Characteristic Impedance?

I start from the telegrapher's equation: $-\frac{dV(z)}{dz}=(R'+j\omega L')I(z)$, where $V(z)$ and $I(z)$ are the phasors of voltage and current respectively, in the transmission line model. ...
131 views

### How does less cable impedance, source/termination impedance, lead to longer cable length for higher data rates?

This question is about high speed digital transmission on a transmission line, I need to know about how does the (1) impedance of the transmission line and the (2) source impedance and (3) ...
159 views

### What is a good tolerance for impedance matching or how to calculate losses?

If you build a microstrip on a silcon wafer, connected by picoprobes via SMA connector and cables to a VNA, what is actually a good match of the impedances of the cables and the waveguide. Is there a ...
267 views

### How does the addition of a bias-t circuit affect the impedance of a transmission line?

I've got a GPS circuit where the antenna is connected directly to the GPS receiver via a coplanar waveguide designed for an impedance of 50ohms. Unfortunately, I neglected to add the bias-t circuit ...
849 views

### How to terminate 50 ohm transmission line without drawing DC

I am sending a 10 MB/sec digital data stream by amplitude moduating a infrared quantum cascade laser. The laser requires a hefty bias of about half an amp (which drops about 8.5 volts across the ...