Pulse width modulation generated by sigma-delta loop

Abstract

The embodiment of the invention relates to pulse width modulation generated by a sigma-delta loop. A sigma-delta (SD) pulse width modulation (PWM) loop includes a loop filter implementing a linear transfer function to generate a loop filter signal, where the loop filter is configured to receive an input signal and a first feedback signal, and to generate the loop filter signal based on the input signal, the first feedback signal, and the linear transfer function; and a hysteresis comparator coupled to an output of the loop filter, the hysteresis comparator configured to receive the loop filter signal and generate a sigma-delta PWM signal based on the loop filter signal, where the first feedback signal is derived from the sigma-delta PWM signal.

Description

technical field [0001] Embodiments of the present disclosure relate generally to pulse width modulation produced by a sigma-delta loop. Background technique [0002] Many applications for pulse width modulation (PWM) include voltage regulation, power level control, and motor control, just to name a few. Each PWM period (ie, transmission cycle) includes a high time for the first part of the PWM period, followed by a low time for the second part of the PWM period, and vice versa. The duration of the first and second parts is adjusted by a pulse width modulator, usually a PWM circuit or a processor. In both states the power consumption is lower because in one state there is no current through the driver and in the other state there is a low switch resistance at the driver. [0003] PWM is widely used to transfer sensor data due to its simplicity. However, it has a serious disadvantage, which is the long time it takes to transfer a single value. This delay problem increases ...

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This leads to increased approximation signal inaccuracy, which gets worse with increasing number of edges

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