公开(公告)号：US10658999B1

公开(公告)日：2020-05-19

申请号：US16506409

申请日：2019-07-09

Applicant: Silicon Laboratories Inc.

Inventor： Essam S. Atalla ,  Ruifeng Sun ,  Mohamed M. Elkholy

IPC: H03H7/38 ,  H03F3/189 ,  H03H7/01

Abstract: Systems and methods are disclosed for on-chip harmonic filtering for radio frequency (RF) communications. A filtering and matching circuit for an integrated circuit includes a first capacitance coupled in parallel with a first inductance, a second inductance coupled to the first inductance, and a variable second capacitance coupled between the first and second inductance. The variable second capacitance is controlled to provide filtering with respect to the RF signal as well as impedance matching with respect to a load coupled to the connection pad. For one embodiment, the variable second capacitance includes a coarse-tune variable capacitor circuit and a fine-tune variable capacitor circuit. The coarse-tuning controls impedance matching, and the fine tuning controls a notch for the filtering. The load can be an antenna for the RF communications. The integrated circuit can include a receive path, a transmit path, or both.

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：US20210013857A1

公开(公告)日：2021-01-14

申请号：US16846520

申请日：2020-04-13

Applicant: Silicon Laboratories Inc.

Inventor： Essam S. Atalla ,  Ruifeng Sun ,  Mohamed M. Elkholy

IPC: H03H7/38 ,  H03H7/01 ,  H03F3/189

Abstract: Systems and methods are disclosed for on-chip harmonic filtering for radio frequency (RF) communications. A filtering and matching circuit for an integrated circuit includes a first capacitance coupled in parallel with a first inductance, a second inductance coupled to the first inductance, and a variable second capacitance coupled between the first and second inductance. The variable second capacitance is controlled to provide filtering with respect to the RF signal as well as impedance matching with respect to a load coupled to the connection pad. For one embodiment, the variable second capacitance includes a coarse-tune variable capacitor circuit and a fine-tune variable capacitor circuit. The coarse-tuning controls impedance matching, and the fine tuning controls a notch for the filtering. The load can be an antenna for the RF communications. The integrated circuit can include a receive path, a transmit path, or both.

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：US10951190B2

公开(公告)日：2021-03-16

申请号：US16846520

申请日：2020-04-13

Applicant: Silicon Laboratories Inc.

Inventor： Essam S. Atalla ,  Ruifeng Sun ,  Mohamed M. Elkholy

IPC: H03H7/38 ,  H03F3/189 ,  H03H7/01

Abstract: Systems and methods are disclosed for on-chip harmonic filtering for radio frequency (RF) communications. A filtering and matching circuit for an integrated circuit includes a first capacitance coupled in parallel with a first inductance, a second inductance coupled to the first inductance, and a variable second capacitance coupled between the first and second inductance. The variable second capacitance is controlled to provide filtering with respect to the RF signal as well as impedance matching with respect to a load coupled to the connection pad. For one embodiment, the variable second capacitance includes a coarse-tune variable capacitor circuit and a fine-tune variable capacitor circuit. The coarse-tuning controls impedance matching, and the fine tuning controls a notch for the filtering. The load can be an antenna for the RF communications. The integrated circuit can include a receive path, a transmit path, or both.