Coupled and Differential Transmission Lines
摘要
Closely-spaced transmission lines exhibit parasitic capacitance and inductance that can couple signals between them. In this chapter we consider a pair of symmetrical, coupled lines and develop equations for the analysis of signals guided by those lines. One application of strong coupling is a device such as a directional coupler, useful in measurements to determine the signal level on a line. The primary focus of this chapter will be on the use of coupled lines for differential signalling. Differential signalling offers a mode of operation that is resistant to noise and interference. In Chapter 11, we use the theory of weakly coupled lines to model crosstalk between closely-spaced transmission lines.