RF and Digital Signal Processing for Software-Defined Radio

Chapter 5. Memoryless Nonlinearity and Distortion

Nonlinear circuits are considered to be either memoryless or with memory. In memoryless circuits, the output of the circuit at time t depends only on the instantaneous input values at time t and not on any of the past values of its input. The output of such a circuit can be expressed in the form of a power series:(5.1)

The output of a nonlinear circuit with memory at time t, on the other hand, depends on the input signal at time t as well as inputs that occurred in previous instances before t. The largest time delay on which the output depends determines the memory of the circuit. In the event where ...