A low noise current-controlled oscillator with high control linearity

The noise performance of a current-controlled oscillator is presented in this paper. The relationship between the noise of the comparator reference voltage and the oscillator timing jitter is discussed. The R-S trigger in the oscillator is used to store the circuit state but limits the speed of the circuit and increases the timing jitter. The current source keeps charging the timing capacitor when the capacitor is discharged, which increases the circuit power dissipation. Several improvements on the oscillator have been suggested to overcome these problems. The new oscillator can operate in high speed with low timing jitter and good control linearity.