Patent ID: 6134429
Filing Date: 2000-10-17
Classification: H03D,H04B,H04L

Abstract:
A direct digital down conversion circuit utilized within a portable station and a cell station of a personal handy phone system, said circuit comprising:a hard limiter circuit coupled to receive an intermediate frequency input signal of a first frequency and utilized within said personal handy phone system, said hard limiter circuit for generating a second signal based on said intermediate frequency input signal, said second signal comprising pulses of a first and a second state and of said first frequency;a sampler circuit coupled to receive said second signal from said hard limiter circuit, said sampler circuit for sampling said second signal using a 19.2 MHz frequency signal and for generating a third signal of a second frequency that is lower than said first frequency; anda single digital down converter circuit coupled to receive said third signal output from said sampler circuit, said digital down converter circuit for using a fourth signal of said second frequency to convert said third signal from said sampler circuit into a digital baseband signal, andwherein said sampler circuit and said digital down converter circuit utilize spectral leakage to generate said digital baseband signal from said intermediate frequency input signal and wherein said intermediate frequency input signal is more than one half the frequency of said 19.2 MHz signal.