公开(公告)号：US20210099148A1

公开(公告)日：2021-04-01

申请号：US16586153

申请日：2019-09-27

Applicant: Silicon Laboratories Inc.

Inventor： Ruifeng Sun ,  Francesco Barale ,  Vinod Jayakumar ,  Sherry Xiaohong Wu ,  Mustafa H. Koroglu ,  Essam S. Atalla

IPC: H03H7/01 ,  H03F3/24

Abstract: Systems and methods are disclosed for on-chip harmonic filtering for radio frequency (RF) communications. For disclosed embodiments, a filter circuit is coupled between a first internal node and a connection pad for an integrated circuit. The filter circuit includes a first inductance, a variable capacitance, and a second inductance. The capacitance amount for the variable capacitance is controlled to tune filtering for the filter circuit to a harmonic of a frequency for a transmit output signal. A power amplifier outputs the transmit output signal to the connection pad without passing through the filter circuit. The filter circuit filters the harmonic of the frequency for the transmit output signal, shunting harmonic current to ground. For one embodiment, the filtered harmonic is a third harmonic of the transmit frequency. For one embodiment, the transmit output signal has an output power greater than or equal to 15 dBm.

公开(公告)号：US11349448B2

公开(公告)日：2022-05-31

申请号：US16586153

申请日：2019-09-27

Applicant: Silicon Laboratories Inc.

Inventor： Ruifeng Sun ,  Francesco Barale ,  Vinod Jayakumar ,  Sherry Xiaohong Wu ,  Mustafa H. Koroglu ,  Essam S. Atalla

IPC: H03F3/24 ,  H03H7/01 ,  H04B1/40

Abstract: Systems and methods are disclosed for on-chip harmonic filtering for radio frequency (RF) communications. For disclosed embodiments, a filter circuit is coupled between a first internal node and a connection pad for an integrated circuit. The filter circuit includes a first inductance, a variable capacitance, and a second inductance. The capacitance amount for the variable capacitance is controlled to tune filtering for the filter circuit to a harmonic of a frequency for a transmit output signal. A power amplifier outputs the transmit output signal to the connection pad without passing through the filter circuit. The filter circuit filters the harmonic of the frequency for the transmit output signal, shunting harmonic current to ground. For one embodiment, the filtered harmonic is a third harmonic of the transmit frequency. For one embodiment, the transmit output signal has an output power greater than or equal to 15 dBm.

公开(公告)号：US10256854B1

公开(公告)日：2019-04-09

申请号：US15875278

申请日：2018-01-19

Applicant: Silicon Laboratories Inc.

Inventor： Rangakrishnan Srinivasan ,  Sriharsha Vasadi ,  Zhongda Wang ,  Mustafa H. Koroglu ,  John M. Khoury ,  Aslamali A. Rafi ,  Michael S. Johnson ,  Francesco Barale ,  Sherry Xiaohong Wu

IPC: H04B1/04 ,  H03F3/195 ,  H03F3/213 ,  H03F3/45 ,  H03K3/017 ,  H03F1/32 ,  H03K3/0231

Abstract: In an embodiment, an apparatus includes: a transmit circuit to upconvert a baseband signal to a first differential radio frequency (RF) signal, the transmit circuit to convert the first differential RF signal to a first single-ended RF signal; a duty cycle correction circuit coupled to the transmit circuit to receive the first single-ended RF signal and compensate for a duty cycle variation in the first single-ended RF signal to output a duty cycle-corrected RF signal; a conversion circuit to convert the duty cycle-corrected RF signal to a second differential RF signal; and an interface circuit to transfer the second differential RF signal from a first ground domain to a second ground domain.