A Low-Cost Low-Power All-Digital Spread-Spectrum Clock Generator

In this brief, a low-cost low-power all-digital spread-spectrum clock generator (ADSSCG) is presented. The proposed ADSSCG can provide an accurate programmable spreading ratio with process, voltage, and temperature variations. To maintain the frequency stability while performing triangular modulation, the fast-relocked mechanism is proposed. The proposed fast-relocked ADSSCG is implemented in a standard performance 90-nm CMOS process, and the active area is 200 μm × 200 μm. The experimental results show that the electromagnetic interference reduction is 14.61 dB with a 0.5% spreading ratio and 19.69 dB with a 2% spreading ratio at 270 MHz. The power consumption is 443 μW at 270 MHz with a 1.0 V power supply.