AN OSCILLATOR CIRCUIT, A SEMICONDUCTOR DEVICE AND AN APPARATUS

摘要

An oscillator circuit (1) for providing an output clock signal (CLK) is described. The oscillator circuit comprising a voltage reference (Vref), a first current source (11), a first capacitor (12), a first capacitor switch (13), a second current source (21), a second capacitor (22), a second capacitor switch (23), a first comparator (15), a second comparator (25) and a flip-flop (30). The first comparator (15) comprises a first chopper-stabilized comparator (150) switchable between a compare phase and a zeroing phase in dependence on the output clock signal and arranged to operate in the compare phase in a first half-phase of the output clock signal to provide a first comparator output (16) from comparing the first capacitor voltage to the reference voltage and arranged to operate in the zeroing phase in the second half-phase. The second comparator (25) comprises a second chopper-stabilized comparator switchable between a respective compare phase and a respective zeroing phase in dependence on the output clock signal and arranged to operate in its compare phase in the second half-phase to obtain a second comparator output (26) from comparing the second capacitor voltage to the reference voltage and arranged to operate in its zeroing phase in the first half-phase.