公开(公告)号：US20240186948A1

公开(公告)日：2024-06-06

申请号：US18550640

申请日：2022-04-05

Applicant: NEWRACOM, Inc.

Inventor： Seong-Sik MYOUNG ,  Jonghoon PARK ,  Chang Hun SONG ,  Haejoon YANG

IPC: H03D7/12 ,  H03K19/20 ,  H04B1/04

CPC classification number: H03D7/12 ,  H03K19/20 ,  H04B1/0475

Abstract: A harmonic rejection mixer that uses switched capacitors for amplitude control and uses two different duty cycle local oscillator (LO) signals for phase control for each harmonic. The harmonic rejection mixer uses 2-vector variable duty harmonic rejection. which allows for the harmonic rejection mixer to be less complex. consume less power, and/or use less components/space compared to conventional harmonic rejection mixers.

公开(公告)号：US20220216834A1

公开(公告)日：2022-07-07

申请号：US17567641

申请日：2022-01-03

Applicant: NEWRACOM, INC.

Inventor： Seong-Sik MYOUNG ,  Ryun Woo KIM

IPC: H03F1/32 ,  H04B1/04 ,  H03F3/24

Abstract: A radio frequency (RF) transmitter includes an analog RF power amplifier and a digital Dynamic Error Vector Magnitude (DEVM) correction module. The DEVM correction module compensates for time-dependent variations in an instantaneous gain of the RF power amplifier. The time-dependent variations may be variations that occur during a period the RF power amplifier is turned on. The RF transmitter may further include one or more analog baseband circuits, and one or more respective baseband digital pre-distortion (DPD) modules that compensate for amplitude modulation to amplitude modulation (AM2AM) nonlinearities in the analog baseband circuits. The digital DEVM correction module and baseband DPD modules may each include respective look-up tables having values determined by respective calibration operations.

公开(公告)号：US20220216856A1

公开(公告)日：2022-07-07

申请号：US17567672

申请日：2022-01-03

Applicant: NEWRACOM, INC.

Inventor： Seong-Sik MYOUNG ,  Jonghoon PARK

IPC: H03H11/04 ,  H03F3/45 ,  H01F27/28

Abstract: A notch filter is coupled to a first input node and a second input node, and is configured to present a capacitive load to a differential signal provided to the first and second input nodes, and to present a series-resonant inductive-capacitive load to a common-mode signal provided to the first and second input nodes. The notch filter includes a transformer and a capacitor bank. The transformer includes a first winding having a positive-polarity terminal coupled to the first input node and a second winding having a positive-polarity terminal coupled to the second input node. The capacitor bank includes a first capacitor coupled between a negative-polarity terminal of the first winding and a bias node, and a second capacitor coupled between a negative-polarity terminal of the second winding and the bias node. The first and second capacitors may be variable capacitors.

公开(公告)号：US20230111481A1

公开(公告)日：2023-04-13

申请号：US18063565

申请日：2022-12-08

Applicant: NEWRACOM, INC

Inventor： Seong-Sik MYOUNG

IPC: H03F3/45 ,  H03F1/32

Abstract: A voltage-to-current converter circuit comprises an amplifier, a resistor, first and second feedback circuits, and an output circuit. The amplifier is configured to receive a differential input voltage signal. The resistor is coupled between first and second nodes of the amplifier. The first feedback circuit is coupled to a third node of the amplifier, provides feedback to the first and second nodes when the value of the input voltage signal is in a first range, and is turned off otherwise. The second feedback circuit is coupled to a fourth node of the amplifier, provides feedback to the first and second nodes when the value of the input voltage signal is in a second range different from the first range, and is turned off otherwise. The output circuit produces a differential current output signal having a value according to the value of the input voltage signal.

公开(公告)号：US20220216840A1

公开(公告)日：2022-07-07

申请号：US17567681

申请日：2022-01-03

Applicant: NEWRACOM, INC.

Inventor： Seong-Sik MYOUNG

IPC: H03F3/45 ,  H03F1/32

Abstract: A voltage-to-current converter circuit comprises an amplifier, a resistor, first and second feedback circuits, and an output circuit. The amplifier is configured to receive a differential input voltage signal. The resistor is coupled between first and second nodes of the amplifier. The first feedback circuit is coupled to a third node of the amplifier, provides feedback to the first and second nodes when the value of the input voltage signal is in a first range, and is turned off otherwise. The second feedback circuit is coupled to a fourth node of the amplifier, provides feedback to the first and second nodes when the value of the input voltage signal is in a second range different from the first range, and is turned off otherwise. The output circuit produces a differential current output signal having a value according to the value of the input voltage signal.

公开(公告)号：US20240097655A1

公开(公告)日：2024-03-21

申请号：US18521622

申请日：2023-11-28

Applicant: NEWRACOM, INC.

Inventor： Seong-Sik MYOUNG ,  Jonghoon PARK

IPC: H03H11/04 ,  H01F27/28 ,  H03F3/45

CPC classification number: H03H11/04 ,  H01F27/28 ,  H03F3/45475 ,  H03H2011/0488

Abstract: A notch filter is coupled to a first input node and a second input node, and is configured to present a capacitive load to a differential signal provided to the first and second input nodes, and to present a series-resonant inductive-capacitive load to a common-mode signal provided to the first and second input nodes. The notch filter includes a transformer and a capacitor bank. The transformer includes a first winding having a positive-polarity terminal coupled to the first input node and a second winding having a positive-polarity terminal coupled to the second input node. The capacitor bank includes a first capacitor coupled between a negative-polarity terminal of the first winding and a bias node, and a second capacitor coupled between a negative-polarity terminal of the second winding and the bias node. The first and second capacitors may be variable capacitors.

公开(公告)号：US20230370099A1

公开(公告)日：2023-11-16

申请号：US18316050

申请日：2023-05-11

Applicant: NEWRACOM, Inc.

Inventor： Seong-Sik MYOUNG ,  Ryunwoo KIM ,  Jong-Han LIM ,  Jeongki CHOI ,  Jaeyoung RYU

IPC: H04B1/04 ,  H04L27/00

CPC classification number: H04B1/0475 ,  H04L27/0008

Abstract: A method for calibrating a radio frequency (RF) transmitter to compensate for a frequency-dependent in-phase quadrature (FDIQ) mismatch is disclosed. The method may include determining in-phase quadrature (IQ) amplitude and phase mismatches of the RF transmitter for a lower side band (LSB) and an upper side band (USB), determining a FDIQ mismatch based on linear fitting the IQ amplitude and phase mismatches for the LSB and the USB, modifying the FDIQ mismatch based on flipping a FDIQ phase mismatch in the LSB and flipping a FDIQ phase mismatch in the USB to generate a modified FDIQ mismatch, determining Fourier coefficients based on applying an inverse fast Fourier transform to the modified FDIQ mismatch, and determining FIR coefficients for a finite impulse response (FIR) filter of the RF transmitter based on windowing the Fourier coefficients.