公开(公告)号：US20210399688A1

公开(公告)日：2021-12-23

申请号：US16904821

申请日：2020-06-18

Applicant: Silicon Laboratories Inc.

Inventor： MUSTAFA KOROGLU ,  LUIGI PANSERI ,  YU SU ,  VITOR PEREIRA

IPC: H03F1/02 ,  H03F3/21 ,  H03F1/32 ,  H04B1/04

Abstract: In one embodiment, an apparatus includes: a digital baseband circuit to receive a digital baseband signal and output a first digital baseband signal and a second digital baseband signal, the second digital baseband signal comprising a scaled version of the first digital baseband signal; a first transmitter signal path coupled to the digital baseband circuit to process the first digital baseband signal and output a first radio frequency (RF) signal; a second transmitter signal path coupled to the digital baseband circuit to process the second digital baseband signal and output a second RF signal; a first power amplifier coupled to the first transmitter signal path to amplify the first RF signal and output an amplified first RF signal; and a second power amplifier coupled to the second transmitter signal path to amplify the second RF signal and output an amplified second RF signal.

公开(公告)号：US20190006990A1

公开(公告)日：2019-01-03

申请号：US15724714

申请日：2017-10-04

Applicant: SILICON LABORATORIES INC.

Inventor： TIAGO MARQUES ,  VITOR PEREIRA

IPC: H03B5/36

CPC classification number: H03B5/364 ,  H03B5/366 ,  H03B2200/0012 ,  H03B2200/0026 ,  H03B2200/004 ,  H03B2200/005 ,  H03B2200/0066 ,  H03F3/72

Abstract: A crystal driver integrated circuit with external oscillation signal amplitude control including an amplifier core, an input pin and an output pin, an adjustable capacitor, and a controller. The controller operates the amplifier core in any one of multiple operating modes including an oscillator mode and a bypass mode. During the bypass mode, the controller disables the amplifier core and adjusts the adjustable capacitor so that an amplitude of an oscillation signal received via the input pin from an external oscillator has a target amplitude. The external oscillation signal may be capacitively coupled for capacitive voltage division or directly coupled for impedance attenuation. An available voltage may be provided as a source voltage to the external oscillator via the output pin. An internal voltage regulator and/or switch may be included to re-provision the output pin to provide the source voltage during the bypass mode.