Figure 13.27a presents an oversampl

Figure 13.27a presents an oversamplcd input sinusoidal signal and the corresponding output signal of a one-bit. dual-zero. Σ-Δ modulator. Figure 13.27b shows the spectral response of the output series. Note that the shaped noise spectrum in the neighborhood of the signal is approximately 80 dB below the peak spectrum of the input sinusoid. Note also that the output signal is restricted to ±1. and that the loop is essentially duty cycle modulating the square wave in proportion to the ampliloop is essentially duty cycle modulating the square wave in proportion to the amplitude of the input signal. Figure 13.28 presents the time series and the spectrum obtained from the output of the down-sampling filter following the modulator.

13.3.6 Sigma-Delta D-to-A Converter (DAC)

The Σ-Δ modulator, originally designed to be embedded in an ADC. has become an essential building block of the reverse task—the digital-to-analog converter(DAC. Nearly all high-end audio equipment and most communication system

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Gambar 13.27a menyajikan oversamplcd sinyal sinusoidal input dan output sinyal sesuai sedikit satu. Dual-nol. Σ-Δ modulasi. Gambar 13.27b menunjukkan respon spektral seri output. Perhatikan bahwa kebisingan berbentuk spektrum di lingkungan sinyal kira-kira 80 dB di bawah spektrum puncak sinusoid masukan. Perhatikan juga bahwa sinyal keluaran dibatasi untuk ±1. dan loop yang pada dasarnya siklus modulasi gelombang persegi sesuai ampliloop adalah pada dasarnya siklus modulasi gelombang persegi sebanding amplitudo sinyal input. Gambar 13,28 menyajikan time series dan spektrum yang Diperoleh dari output dari down-sampling filter berikut yang modulator.13.3.6 sigma-Delta D-untuk-A Converter (DAC)Modulasi Σ-Δ, awalnya dirancang untuk ditanamkan dalam ADC. telah menjadi blok bangunan penting tugas reverse-digital-ke-analog konverter (DAC. Hampir semua high-end peralatan audio dan kebanyakan sistem komunikasi