IMPROVED RELAXATION OSCILLATOR WITH LOW DRIFT AND NATIVE OFFSET CANCELLATION

摘要

In described examples, relaxation oscillator circuitry (10) has low drift and native offset cancellation. An amplifier (12, R1) amplifies a first current signal (I1) to provide a pulse amplifier output waveform (VOTA1). An integrator (14, C1) integrates a second current signal (I2) to provide a ramp output waveform (VOTA2). A comparator (16) compares the integrator output waveform (VOTA2) with a threshold set by the amplifier output waveform (VOTA1) to generate an alternating oscillator output (VOUT) used for switching the polarities of the first and second current signals (I1, 12).