| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To obtain a bandpass typeΔΣmodulator which is designed for use with a desired frequency. <P>SOLUTION: A bandpass typeΔΣmodulator (exceptθ<SB POS="POST">0</SB>=±π/2×n; n is an integer equal to or greater than 1) by replacing z in the z region model of a low-pass typeΔΣmodulator with the z' given below. z'=f<SB POS="POST">cnv</SB>(z,θ<SB POS="POST">0</SB>), where f<SB POS="POST">cnv</SB>(z,θ<SB POS="POST">0</SB>) is a functionθ<SB POS="POST">0</SB>=2π×(f<SB POS="POST">0</SB>/fs) with respect to arbitrary z andθ<SB POS="POST">0</SB>, in which the absolute value of f<SB POS="POST">cnv</SB>(z,θ<SB POS="POST">0</SB>) is always 1, where fs is a sampling frequency and f<SB POS="POST">0</SB>is the center frequency of the quantization noise stop band of the bandpass typeΔΣmodulator. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
