公开(公告)号：US11522557B1

公开(公告)日：2022-12-06

申请号：US17388157

申请日：2021-07-29

Applicant: NXP B.V.

Inventor： Robert Rutten ,  Martin Kessel ,  Hendrik van der Ploeg ,  Lucien Johannes Breems ,  Muhammed Bolatkale ,  Evert-Jan Pol ,  Manfred Zupke ,  Bernard Burdiek ,  Johannes Hubertus Antonius Brekelmans ,  Shagun Bajoria

IPC: H03M3/00

Abstract: A digital conversion system including a sigma-delta converter, a tone generator that generates injects a tone signal into the conversion path of the sigma-delta converter at a frequency that is outside operating signal frequency range, a tone detector that isolates and detects a level of the injected tone signal and provides a corresponding tone level value, a tone ratio comparator that converts the tone level value into a tone level ratio and that compares the converted tone level ratio with an expected tone level ratio to provide an error signal, and a loop controller that converts the error signal to a correction signal to adjust a loop filter frequency the sigma-delta converter. Tones may be serially injected one at a time or simultaneously in parallel for determining a measured tone level ratio for comparison with a corresponding one of multiple stored expected tone level ratios.

公开(公告)号：US11502699B1

公开(公告)日：2022-11-15

申请号：US17357467

申请日：2021-06-24

Applicant: NXP B.V.

Inventor： Robert Rutten ,  Hendrik van der Ploeg ,  Lucien Johannes Breems ,  Martin Kessel ,  Muhammed Bolatkale ,  Bernard Burdiek ,  Manfred Zupke ,  Johannes Hubertus Antonius Brekelmans ,  Shagun Bajoria

IPC: H03M3/00

Abstract: A digital conversion system including a sigma-delta converter, a signal generator providing a substantially symmetrical injection signal that is injected into the sigma-delta converter conversion path, bandpass filters for filtering the injection signal and the output of the sigma-delta converter, a correlator that correlates the filtered signals for providing an error signal, and a loop controller that uses the error signal to adjust a resonant frequency of the sigma-delta converter to output a target notch frequency. The loop controller may adjust a resonant frequency of a loop filter of the sigma-delta converter, in which the bandpass filters may each be centered at the target notch frequency at the output of the sigma-delta converter. The correlator may include a complex conjugate block, a multiplier and a mean calculator. The loop controller may include a converter and an amplifier and an integrator or a least-mean square block.

公开(公告)号：US20200313709A1

公开(公告)日：2020-10-01

申请号：US16366291

申请日：2019-03-27

Applicant: NXP B.V.

Inventor： Andreas Johannes Köllmann ,  Bernard Burdiek

IPC: H04B1/16 ,  H03K17/687 ,  H03F1/56 ,  H03F3/45

Abstract: Embodiments are directed to a buffer circuit that includes a first circuit and a second circuit. The first and second circuits include sets of transistors along pairs of related signal paths, each of the transistors being driven in response to two related input signals having different but related phases. The first circuit generates a first related output signal in response to one of the pairs of related signal paths and the second circuit generates a second output signal in response to another of the pairs of related signal paths. The first and second circuits provide a linear transfer function across one of the first and one of the second sets of transistors via one of the first pair and second pair of related signal paths.

公开(公告)号：US10886959B2

公开(公告)日：2021-01-05

申请号：US16366291

申请日：2019-03-27

Applicant: NXP B.V.

Inventor： Andreas Johannes Köllmann ,  Bernard Burdiek

IPC: H04B1/16 ,  H03K17/687 ,  H03F1/56 ,  H03F3/45

Abstract: Embodiments are directed to a buffer circuit that includes a first circuit and a second circuit. The first and second circuits include sets of transistors along pairs of related signal paths, each of the transistors being driven in response to two related input signals having different but related phases. The first circuit generates a first related output signal in response to one of the pairs of related signal paths and the second circuit generates a second output signal in response to another of the pairs of related signal paths. The first and second circuits provide a linear transfer function across one of the first and one of the second sets of transistors via one of the first pair and second pair of related signal paths.