A 1.2- mu m CMOS current-controlled oscillator

A simple, fully symmetrical, current-controlled CMOS oscillator is presented. The oscillator uses two grounded capacitors. This 5-V architecture permits relatively large capacitor voltage amplitudes, thus minimizing jitter. The design also operates with power supply voltages as low as 3 V. Because there are no special capacitor requirements, the design is compatible with standard scaled digital CMOS processes. The use of a double differential latching comparator allows high-speed operation with good control linearity. The circuit was successfully fabricated using a 1.2- mu m CMOS process.