Author_Institution :
Dept. of Electron. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan
Abstract :
A new structure for digitally controlled oscillator (DCO) is presented in this paper. The proposed structure of DCO is implemented by standard cell library, and with the help of C program and HSPICE simulator, the DCO can be designed in a systematic way. The DCO, which is realized on a IP4M 0.35-μm. CMOS process, has a target frequency at 250 MHz, and it covers three process, voltage, and temperature (PVT) conditions: (FF, 3.6 V, 0°C), (TT, 3.3 V, 25°C), and (SS, 3.0 V, 100°C). The DCO, which is realized on a IP5M 0.25-μm CMOS process, has a target frequency at 400 MHz, and it covers three PVT conditions: (FF, 2.75 V, 0°C), (TT, 2.5 V, 25°C), and (SS, 2.25 V, 100°C). The DCO has 32-bit control and achieves LSB resolution under 1 ps
Keywords :
CMOS digital integrated circuits; SPICE; cellular arrays; circuit simulation; digital phase locked loops; 0 to 100 degC; 0.25 micron; 0.35 micron; 2.25 to 2.75 V; 250 MHz; 3.0 to 3.6 V; 32 bit; 400 MHz; C program; CMOS process; HSPICE simulator; LSB resolution; all-digital PLLs; digitally controlled oscillator; standard cell library; CMOS process; Delay effects; Digital control; Frequency; Helium; Inverters; Propagation delay; Temperature; Voltage; Voltage-controlled oscillators;
