Patent ID: 6181754
Filing Date: 2001-01-30
Classification: H04B,H04L

Abstract:
A system for modeling output signals produced by mixed analog and digital circuitry in a digital signal design environment that provides an input signal, the input and output signals having an in-phase component and a quadrature component when represented in rectangular coordinates and the input and output signals having a radial component and an angular component when represented in polar coordinates, the system comprising:a non-linear static angular correction unit, disposed to receive the input signal, for rotating the input signal to generate a rotated signal;a first linear filter, disposed to receive said rotated signal, to linearly filter said rotated signal to generate a filtered rotated signal;a non-linear dynamic radial correction unit comprising:a second linear filter, disposed to receive said radial component of the input signal, to linearly filter said radial component of the input signal and to generate a first radial correction component;a non-linear filter, disposed to receive said radial component of the input signal, to capture frequency-dependent gain compression and to generate a second radial correction component;a radial correction factor unit, disposed to receive said first and second radial correction components, to determine a radial correction factor based upon said first and second radial correction components; anda correction unit, for integrating said radial correction factor and said filtered rotated signal to model said output signal.