DESIGN METHOD FOR BANDPASS ΔΣ MODULATOR, BANDPASS ΔΣ MODULATOR, DEVICE HAVING BANDPASS ΔΣ MODULATOR, AND METHOD USING BANDPASS ΔΣ MODULATION

摘要

The purpose is to provide a bandpass ΔΣ modulator for use at a desired frequency. A bandpass ΔΣ modulator is obtained by replacing z in the z region model of a low-pass ΔΣ modulator with z' below (in no event does θ₀ = ±π/2×n, where n is an integer equal to 1 or greater). z' = f_cnv(z, θ₀) f_cnv(z, θ₀) is function such that, for any values of z and θ₀, the absolute value of f_cnv(z, θ₀) is always 1. θ₀ = 2π × (f₀/fs), where f₀ is the sampling frequency, and fs is the center frequency of the quantization noise-inhibiting band of the bandpass ΔΣ modulator.