摘要:
Power and data are transmitted via a transformer including primary side and secondary side. A primary side signal is generated by coupling a first oscillator signal modulated with a data signal with a second oscillator signal that is selectively switched on and off. At the secondary side a secondary signal is generated. A demodulator demodulates the secondary signal to recover the data signal. A rectifier processes the secondary signal to recover a power supply signal controlled by switching on and off the second oscillator.
摘要:
A modulation circuit that can improve an on/off ratio or increase short pulses, and a wireless communication apparatus are provided. The modulation circuit includes a first transistor in which a first signal is input to a gate terminal; a second transistor that is cascode-connected to the first transistor by connecting a source terminal to a drain terminal of the first transistor, that receives an input of a second signal having a frequency lower than the first signal at a gate terminal, and that modulates the second signal by the first signal and outputs the modulated second signal; and a switch circuit that is formed on the output side of the second transistor. The switch circuit is turned on in synch with a switching of the second transistor to an off state, and turned off in synch with a switching of the second transistor to an on state.
摘要:
An ASK modulator includes a baseband unit which obtains a sequence comprising at least one amplitude value and adds an additional value to each of the at least one amplitude value to generate a modified sequence; a digital-to-analog converter coupled to the baseband unit, the digital-to-analog converter converts the modified sequence to generate a first signal, the additional value is determined based on a half scale of the digital-analog converter; and a mixer which receives the first signal and a second signal and generate a modulated signal by mixing the first signal with the second signal.
摘要:
A resonant power feeding system that can provide high power transmission efficiency between a power feeding device and a power reception device without dynamically controlling the oscillation frequency in accordance with the distance between the power feeding device and the power reception device. High power transmission efficiency between the power feeding device and the power reception device is obtained by addition of a structure for adjusting the matching condition to both the power reception device and the power feeding device. Specifically, a transmission-reception circuit and a matching circuit are provided in both the power reception device and the power feeding device, and wireless signals for adjusting the matching circuit are transmitted and received through a resonant coil. Thus, the power feeding device can efficiently supply power to the power reception device without adjusting the oscillation frequency.
摘要:
Circuitry separates a modulation signal into digital sign and magnitude signal components. The digital magnitude signal is converted to an analog magnitude signal. The analog magnitude signal is the mixed with an in-phase or quadrature carrier signal under the influence of the digital sign signal and routed to a driver output stage.
摘要:
Various embodiments relate to a transmission circuit and related method of shaping the transmission spectrum of a carrier signal. The transmission circuit may comprise a plurality of switching amplifier stages that are controlled by a modulation sequence produced by a transmission (TX) modulator. The TX modulator may receive the transmission data as a sequence of bit groups and may produce a modulation sequence including a plurality of control bits that may drive each of the switching amplifier stages. In some embodiments, one or more pulse-shaping filters may modify in-phase (I) and quadrature (Q) phase components of the transmission data. The modified components may directly shape spectral content of the output signal produced by a transmission driving circuit. Higher quantities of amplifier stages included in the transmission driving circuit may add higher granularity to the shape of the spectrum of the output signal.
摘要:
Provided are a compound semiconductor device and a method of manufacturing the same. The semiconductor device includes: a substrate including a first region and a second region; a transistor including first to third conductive impurity layers stacked on the substrate of the first region; and a variable capacitance diode spaced apart from the transistor of the first region and including the first and second conductive impurity layers stacked on the substrate of the second region.
摘要:
A multi-chip stack structure and a signal transmission method are disclosed in specification and drawing, where the multi-chip stack structure includes first and second chips. The first chip includes a first inductance coil with a first series capacitor, and the second chip includes a second inductance coil with a second series capacitor. The first and second inductance coils are magnetically coupled to each other. The magnetically coupled inductance coils and the capacitors constitute a coupling filter.
摘要:
Embodiments of the present invention include amplitude-modulated or polar-modulated radio frequency (RF) power amplifier circuitry, in which an envelope power supply input to an RF power amplifier is powered by a pre-distorted amplitude modulation (AM) power supply. The pre-distorted AM power supply receives an AM signal, which is then pre-distorted and amplified to provide an AM power supply signal to the RF power amplifier. The pre-distortion of the AM signal is used to improve the linearity, the efficiency, or both, of the RF power amplifier. The pre-distortion provides a feed-forward system, which may allow use of a reduced bandwidth pre-distorted AM signal to an AM power supply and a reduced bandwidth AM power supply, which may increase efficiency.
摘要:
Various apparatuses and methods for offsetting the phase and/or frequency of a clock signal are disclosed herein. For example, some embodiments provide an apparatus for generating a clock signal, including a quadrature delay circuit connected to an input clock signal. The quadrature delay circuit outputs components of the input clock signal with different phase shifts. A first amplitude modulator is connected to the first output of the quadrature delay circuit, and a second amplitude modulator is connected to the second output of the quadrature delay circuit. A summer combines the output of the first and second amplitude modulators.