公开(公告)号：US20240243698A1

公开(公告)日：2024-07-18

申请号：US18409527

申请日：2024-01-10

Applicant: STMicroelectronics International N.V.

Inventor： Nunzio SPINA ,  Alessandro CASTORINA ,  Giuseppe PALMISANO

IPC: H03F1/02 ,  H03F3/45 ,  H03K5/24

CPC classification number: H03F1/0233 ,  H03F3/45475 ,  H03K5/24 ,  H03F2200/105

Abstract: An envelope detector receives a modulated signal and a differential stage coupled to the detector produces a replica modulated signal compared to produce a PWM-modulated signal having on and off times. A first switch is actuated to short-circuit the input to the envelope detector. A second switch is actuated to feed back to a storage capacitor a signal indicative of the difference between inputs to the differential stage. A third switch is actuated to short-circuit an input to the comparator. Logic circuitry activates the switched to implement offset compensation where: the first, second and third switches are actuated in the absence of the PWM-modulated signal during start-up and standby phases; and the first, second and third switches are actuated during off times of the PWM-modulated signal in a working phase alternating with the start-up/standby phases.