公开(公告)号：US20220103135A1

公开(公告)日：2022-03-31

申请号：US17033008

申请日：2020-09-25

Applicant: Apple Inc.

Inventor： Aly Ismail ,  Amr O. Haggag

IPC: H03F1/42 ,  H03F3/00

Abstract: Embodiments relate to a circuit implementation for extending the bandwidth of an amplifier. The extended bandwidth amplifier includes an amplifier coupled between an input node and an output node of the extended bandwidth amplifier. The amplifier has an input capacitance and an output capacitance. The extended bandwidth amplifier additionally includes a first digitally-trimmable negative-capacitance capacitor coupled between the input node of the extended bandwidth amplifier and a power supply terminal. The digitally-trimmable negative-capacitance capacitor includes a first branch, a second branch, and a controller. The first branch includes a first capacitor having a first negative capacitance, and a first switch. The second branch includes a second capacitor having a second negative capacitance, and a second switch. The controller is configured to turn on the first switch and the second switch based on the input capacitance of the amplifier.