Abstract:
A method and apparatus for dynamic resource allocation of an RF sampling system based on a signal quality measurement determined by generating a plurality of time-interleaved samples from a received radio frequency (RF) signal and combining the plurality of time-interleaved samples to generate the signal quality.
Abstract:
A discrete time receiver includes a low noise transconductance amplifier (LNTA), a discrete time sampler, a passive discrete time circuit, and a switched capacitor amplifier. The LNTA amplifies a received RF signal and provides an amplified RF signal. The discrete time sampler samples the amplified RF signal (e.g., with multiple phases of a sampling clock) and provides first analog samples. The passive discrete time circuit decimates and filters the first analog samples and provides second analog samples. The switched capacitor amplifier amplifies the second analog samples and provides third analog samples. The discrete time receiver may further include a second passive discrete time circuit, a second switched capacitor amplifier, and an analog-to-digital converter (ADC) that digitizes baseband analog samples and provides digital samples. The discrete time receiver can flexibly support different system bandwidths and center frequencies.
Abstract:
Eine Vorrichtung (10) zum Empfangen eines Informationssignals (S HF (t)) mit einem Informationssignalspektrum (S HF (f)), mit einer Mehrzahl von Empfängern (12-n) zum Erzeugen jeweils eines Einzelsignals (s n [k] ) aus dem Informationssignal, wobei jeder der Mehrzahl von Empfängern einen Mischer (31-n) zum Abwärtsmischen des Informationssignals mit einem jeweiligen Abwärtsmischsignal (32-n) aufweist, und sich die Abwärtsmischf requenzen (f LO ,n ) unterscheiden, so dass Spektren der Einzelsignale (S n (f) ) jeweils einem unterschiedlichen Teil des Informationssignalspektrums entsprechen, und einer Einrichtung (14) zum Kombinieren der Einzelsignale (s n [k]) in ein kombiniertes Signal, so dass das Spektrum (S ges (f)) des kombinierten Signals das Informationssignalspektrum (S HF (f)) nachbildet.
Abstract translation:用于与信息信号频谱接收信息信号(SHF(t))的一个装置(10)(SHF(F)),与用于产生每个单独的信号的多个接收器(12-n)的从信息信号(S N [K]), 其中,所述多个具有用于与相应的缩混信号(32-n),以及所述Abwärtsmischfrequenzen缩混的信息信号的混频器(31-n)的接收器中的(F LO,n)的不同,所以各个信号的那个光谱(SN(F) ),每个对应于信息信号频谱的不同部分,以及装置(用于组合各个信号(S N [K])成组合信号14),从而使光谱(STOT(F)的组合信号的((SHF F)),信息信号频谱 )复制。
Abstract:
An outdoor satellite receiving unit (ODU) receives several independent satellite signals, selects two signals with a switch matrix, downconverts the two signals to a bandstacked signal with a high and a low band signal, and outputs the bandstacked signal on the same cable to receiver units. Several satellite signals can be selected in groups of two or more and output to independent receiver units. Signal selecting is performed at the received radio frequency (RF) and bandstacking is performed with a single downconversion step to an intermediate frequency (IF). Channel stacking on the same cable of more than two channels from several satellites can be achieved by using frequency agile downconverters and bandpass filters prior to combining at the IF output. A slow transitioning switch minimizes signal disturbances when switching and maintains input impedance at a constant value.
Abstract:
An RF transceiver apparatus comprises transmitter circuitry arranged to convert signals from a baseband frequency to RF transmission frequencies and receiver circuitry arranged to convert signals from RF reception frequencies to the baseband frequency. The transmitter and receiver circuitry each comprise three mixers arranged to convert signals between the baseband frequency, a first intermediate frequency; a second intermediate frequency that is higher than the transmission frequencies; and a second intermediate frequency that is higher than the reception.
Abstract:
Apparatus and methods are provided for integrally packaging semiconductor IC (integrated circuit) chips and antenna devices which are integrally constructed from package frame structures (e.g., lead frame, package carrier, package core, etc.), to thereby form compact integrated radio/wireless communications systems for millimeter wave applications. For example, an electronic apparatus (30) includes a package frame (11) having an antenna (12) that is integrally formed as part of the package frame (11), an IC (integrated circuit) chip (13) mounted to the package frame (11), interconnects (19) that provide electrical connections to the IC chip (13) and the antenna (12), and a package cover (15).
Abstract:
An improved receiver architecture and method for a wireless transceiver (e.g. for a headphone) is provided whereby the receiver, advantageously, enables the use of only one synthesizer circuit for both the RF-to-IF and IF-to-base band conversion processes which, in turn, provides for lower power consumption. The receiver includes an injection locked local receiver oscillator (Rx LO) which is used for the first mixing stage (i.e. the RF-to-IF conversion). The Rx LO 105 is thereby able to use a high-level harmonic of a relatively low reference frequency signal produced by that synthesizer (e.g. a fractional-N phase locked loop circuit (PLL)). The receiver further includes a tunable Q-enhanced IF filter 110 and complex sub-sampling and mixing down-conversion circuitry for the second conversion stage (i.e. IF-to-baseband conversion). The sampling frequency used for the second conversion stage is a harmonic of the reference frequency derived from the synthesizer (PLL). For example, transceiver channels may be designed on the basis that the RF frequency F R1 is assigned a value of (n±¼)•f s , where the frequency f PLL of the PLL may be chosen to be twice the sub-sampling frequency f s and the frequency f Rx LO of the Rx LO may be nine times the frequency f PLL .
Abstract translation:提供了一种用于无线收发器(例如,用于耳机)的改进的接收器架构和方法,由此接收器有利地仅使用一个合成器电路用于RF至IF和IF至基带频带转换过程,其中 反过来又提供较低的功耗。 接收机包括用于第一混频级(即RF至IF转换)的注入锁定本地接收机振荡器(Rx LO)。 因此,Rx LO 105能够使用由该合成器(例如,分数N锁相环电路(PLL))产生的相对低的参考频率信号的高电平谐波。 接收机还包括可调Q增强IF滤波器110和用于第二转换级(即IF到基带转换)的复数次采样和混合下转换电路。 用于第二转换级的采样频率是从合成器(PLL)导出的参考频率的谐波。 例如,可以基于RF频率F SUB R1分配值(n±¼)f S s S s来设计收发器信道,其中频率f PLL的PLL SUB>可以选择为子采样频率f SUB的两倍,并且Rx LO的频率f RxLO SUB>可以是9倍 频率f PLL PLL。
Abstract:
Le dispositif de réception et/ou d'émission de signaux radiofréquences comprend une antenne (8) pour capter ou transmettre des signaux radiofréquences, un filtre passe-bande (9), au moins un amplificateur à faible bruit (11) pour amplifier les signaux filtrés, un étage oscillateur (1) pour générer des premiers signaux haute fréquence (SVCO), au moins un diviseur de fréquence (14) pour diviser par M la fréquence des premiers signaux afin de générer des seconds signaux haute fréquence (SD), où M est un nombre entier plus grand que 1, au moins un premier bloc mélangeur (12) pour mélanger les signaux radiofréquences filtrés et amplifiés (SR) avec les premiers signaux haute fréquence (SVCO), et au moins un second bloc mélangeur (13) pour mélanger les signaux intermédiaires fournis par le premier bloc mélangeur avec les seconds signaux haute fréquence afin de produire des signaux en bande de base (IR, QR). L'étage oscillateur (1) est configuré de telle manière à générer des premiers signaux haute fréquence (SVCO), dont la fréquence est en dehors de la bande de fréquence du filtre passe-bande et plus grande d'un facteur M/N compris entre 1 et 2 que la fréquence des signaux radiofréquences reçus, où N est un nombre entier plus grand que 1.
Abstract:
A differential radio frequency (RF) receiver includes a fully differential direct conversion receive chain, a subharmonic mixer in the receive chain, the subharmonic mixer configured to receive a differential radio frequency (RF) input signal and a local oscillator (LO) signal that is phase-shifted by a nominal 45 degrees, and a synthesizer having a voltage controlled oscillator and having at least one frequency divider to generate desired receive LO signals.
Abstract:
The present invention relates to a clocking apparatus (10) and method for generating clock signals based on a variable frequency signal generated by a signal generating means (20) and controlled by a frequency control information such as a frequency control word (FCW). This information also enables to obtain, through storage means (60) storing for example a plurality of look-up tables, a processing control information provided to a digital signal processing means (50) which comprises elements sensitive to sampling frequency rate variations such as a phase shifter means (510), a filter means (520) with a configurable impulse response, and dependent on sampling frequency rate variations such as a re-sampler means (530). The variable frequency signal is used to clock an analog-to-digital converter or, as an alternative, a digital-to-analog converter at a respective sampling frequency. This sampling frequency is used by a clock generator means (30) to serve as a reference for all other clocking in the digital signal processing means (50). The re-sampler means (530) will be preferably located behind the filter means (520) and will comprise a digital oscillator (531) and a re-sampler (532) clocked by a clock signal based on said variable frequency signal and having its outgoing register clocked by a frequency generated by said digital oscillator (531).