Apparatuses, systems, and methods for frequency-dependent signal modulation

    公开(公告)号:US12051462B2

    公开(公告)日:2024-07-30

    申请号:US17889154

    申请日:2022-08-16

    CPC classification number: G11C11/4093 G11C11/565 H04L27/08

    Abstract: Apparatuses, systems, and methods for high-pass filtering pre-emphasis circuits. A device may use a pre-emphasis driver to provide a multi-level signal based on multiple binary signals. The pre-emphasis driver includes a primary driver coupled in parallel with at least one equalizer path, each of which includes an equalizer driver and a filtering element. The filtering element may be an AC filtering element, such as a capacitor. The equalizer paths may contribute equalized signal(s) which have a high-pass filtering behavior. The pre-emphasis circuit may combine the primary signal from the primary driver and the equalized signals to generate an overall output multi-level signal. In some embodiments, the pre-emphasis driver may be a pulse amplitude modulated (PAM) driver, such as a PAM4 driver with four levels of the multi-level driver.

    Receiver/transmitter co-calibration of voltage levels in pulse amplitude modulation links

    公开(公告)号:US11711246B2

    公开(公告)日:2023-07-25

    申请号:US17711328

    申请日:2022-04-01

    Applicant: Rambus Inc.

    Inventor: Reza Navid

    Abstract: A driver circuit of a PAM-N transmitting device transmits a PAM-N signal via a communication channel, wherein N is greater than 2, and the PAM-N signal has N signal levels corresponding to N symbols. A PAM-N receiving device receives the PAM-N signal. The PAM-N receiving device generates distortion information indicative of a level of distortion corresponding to inequalities in voltage differences between the N signal levels. The PAM-N receiving device transmits to the PAM-N transmitting device the distortion information indicative of the level of the distortion. The PAM-N transmitting device receives the distortion information. The PAM-N transmitting device adjusts one or more drive strength parameters of the driver circuit of the PAM-N transmitting device based on the distortion information.

    CIRCUIT AND METHOD FOR DETERMINING A DITHER AMPLITUDE

    公开(公告)号:US20230224197A1

    公开(公告)日:2023-07-13

    申请号:US18152531

    申请日:2023-01-10

    Inventor: Kristian MÜLLER

    CPC classification number: H04L27/08 H04L27/361 H04L27/3809

    Abstract: A dither amplitude circuit has a current circuit for receiving DC voltage signals and generating a direct current on a basis thereof, and generating a dither signal, and a dither current on the basis thereof, applying the dither current to the direct current in order to obtain a drive current, artificially modulating the amplitude of the dither signal or a directly modulated drive current with an amplitude modulation deviation on a periodic basis such that a quantization threshold is reliably exceeded. The dither amplitude circuit also has a return current detection circuit that generates numerous quantized digital values in a time period on a basis of the drive current flowing through a load, such that the dither amplitude can be determined from the numerous digital values.

    Wireless receiver apparatus and method

    公开(公告)号:US11689230B2

    公开(公告)日:2023-06-27

    申请号:US17474231

    申请日:2021-09-14

    Inventor: Kuo-Ken Huang

    CPC classification number: H04B1/10 H04B1/0028 H04B1/0078 H04L27/08

    Abstract: Embodiments of the invention include a wakeup receiver (WRX) featuring a charge-domain analog front end (AFE) with parallel radio frequency (RF) rectifier, charge-transfer summation amplifier (CTSA), and successive approximation analog-to-digital converter (SAR ADC) stages. The WRX operates at very low power and exhibits above-average sensitivity, random pulsed interferer rejections, and yield over process.

    Method and apparatus for digitization of broadband analog signals

    公开(公告)号:US09979574B2

    公开(公告)日:2018-05-22

    申请号:US14838028

    申请日:2014-02-25

    CPC classification number: H04L27/08 H03M1/12 H04B1/00

    Abstract: Methods and systems for digitization of broadband analog signals may comprise in a radio frequency (RF) transceiver comprising a diplexer, first and second automatic gain and slope control (ASCS) modules, a combiner, and an analog to digital converter (ADC): receiving an input RF signal comprising at least two signals, splitting the input RF signal in the frequency domain into first and second signals of different frequency utilizing the diplexer, configuring a frequency-dependent gain level for each of the first and second signals utilizing the first and second ASCS modules, combining output signals from the first and second ASCS modules utilizing the combiner, and converting the combined output signals to a digital signal utilizing the ADC. The frequency dependent gain levels of the first and second signals may be configured to enable the ADC to operate with an effective number of bits (ENOB) of approximately 10.

    TRANSMITTER, TRANSMISSION SYSTEM, AND TRANSMISSION METHOD

    公开(公告)号:US20170222606A1

    公开(公告)日:2017-08-03

    申请号:US15501465

    申请日:2015-08-03

    Inventor: Masaaki TANIO

    Abstract: A transmitter, a transmission system and a transmission method whereby AM-PM distortions can be compensated with high accuracy without affecting the functions of a predistortor, a ΔΣ modulator and so on. The transmitter includes: a baseband signal generation circuit that outputs the amplitude value and phase value of a baseband signal; a ΔΣ modulation circuit that performs a ΔΣ modulation of the outputted amplitude and phase values to output a pulse signal train; a power supply modulation circuit that supplies, to a pre-stage amplifier, a voltage determined in accordance with the outputted amplitude value; the pre-stage amplifier and a post-stage amplifier that amplify the outputted pulse signal train; and a filter circuit that generates an output signal from the pulse signal train as amplified and outputs the output signal. The power supply modulation circuit determines the voltage for canceling a phase error occurring in the post-stage amplifier.

    Method and device for improving acoustics of an AM demodulation output signal

    公开(公告)号:US09680435B1

    公开(公告)日:2017-06-13

    申请号:US15257418

    申请日:2016-09-06

    CPC classification number: H03G3/3005 H03G3/3052 H03G3/3068 H03M1/124 H04L27/08

    Abstract: A method for improving acoustics of amplitude modulation (AM) audio signal, comprising: amplifying and mixing, with an amplitude modulation (AM) front-end module, an analog AM signal and an automatic gain control (AGC) signal from an AGC module; converting and sampling, with an analog-digital converter and down-sampling module, the amplified and mixed signal to generate a digital AM signal; digitally mixing, with a digital mixer module, the digital AM signal to generate a first digital AM envelope signal; compensating, with an AM compensator module, the first digital AM envelope signal by an AM compensating AGC signal from the AM compensator module to generate a second digital AM envelope signal; demodulating, with a demodulation module, the second digital AM envelope signal; and outputting, with an output module, a demodulated AM audio signal.

    Method for a contactless communication between two NFC devices with impact reduction of an external noise emission
    10.
    发明授权
    Method for a contactless communication between two NFC devices with impact reduction of an external noise emission 有权
    两个NFC设备之间的非接触式通信的方法,具有减少外部噪声发射的影响

    公开(公告)号:US09509373B2

    公开(公告)日:2016-11-29

    申请号:US14860188

    申请日:2015-09-21

    Inventor: Achraf Dhayni

    CPC classification number: H04B5/0031 H04B5/0056 H04B5/0068 H04B15/02 H04L27/08

    Abstract: A system can be used for contactless communication of information between a first device and a second device, each having an antenna intended to be coupled via a near magnetic field. The first device includes a transmit chain having first circuitry configured to generate a digital data stream corresponding to the information to be transmitted, and second circuitry configured to generate a first amplitude-modulated and dithered signal in the antenna of the first device from this stream and from an application of a first dithering. The second device includes a receive chain having third circuitry configured to carry out a frequency transposition of a second amplitude-modulated and dithered signal originating from the first signal, with application of a second dithering synchronous with the first dithering.

    Abstract translation: 系统可用于在第一设备和第二设备之间进行无接触的信息通信,每个设备具有旨在通过近场磁场耦合的天线。 所述第一设备包括具有第一电路的发射链,所述第一电路被配置为产生与要发射的信息相对应的数字数据流;以及第二电路,被配置为从所述流在所述第一设备的天线中产生第一幅度调制和抖动信号, 从第一个抖动的应用程序。 第二设备包括具有第三电路的接收链,该第三电路被配置为执行与第一抖动同步的第二抖动的来自第一信号的第二幅度调制和抖动信号的频率转置。

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