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WO/2003/105334A1 |
A phase-amplitude modulator for mobile communications employs a phase detector (16), a low pass filter (18) and a voltage controlled oscillator (20) combined in a phase lock loop as an input to a nonlinear power amplifier (22) providing ...
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WO/2003/103149A2 |
Apparatus for detecting the envelope of an RF signal that comprises an RF transistor operating essentially at a non-linear operating point at the RF frequency range; a DC power supply for feeding the RF transistor; a dummy load for termi...
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WO/2003/096532A1 |
Disclosed is a demodulation apparatus for a digital audio amplifier capable of solving a space, cost and heat generation of the digital audio amplifier. The demodulation apparatus includes a first inductor connected between a positive di...
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WO/2003/090353A2 |
An arrangement for tracking the resonant frequency of one or more electrically resonant structures (11, 21) through a single channel comprises a variable frequency oscillator (13, 23) associated with the or each resonant structure (11, 2...
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WO/2003/086829A1 |
The present invention relates to an ASK transmitter using a multi-layer non-radiative dielectric waveguide. According to the present invention, millimeter waves are oscillated using Gunn diodes in a multi-layer structure having non-radia...
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WO/2003/088494A1 |
This invention relates to a circuitry connectable to a charge pump for reducing leakage current associated with said charge pump. The invention is based on the idea that the voltage in the node from which a charge pump load is charged or...
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WO/2003/085415A2 |
Direct up-conversion of a signal (10) is accomplished using a sampling pulse generator circuit (12, 16, 20, 24) and a gated differential amplifier 26, enabled by the sampling signal (25). When not enabled, the output of the differential ...
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WO/2003/081771A1 |
The bias circuit of the present invention can be configured for extremely stiff biasing for Class A circuits, which is solid under heavy RF input overdrive. Alternatively, the circuit may be configured for controlled self biasing for use...
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WO/2003/081868A2 |
The invention relates to a two-point modulator assembly (10), which has been improved in relation to conventional two-point modulators in such a way that the high-pass coupling point of the modulator, which comprises a phase-locked loop ...
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WO/2003/081772A1 |
The present invention provides methods and apparatus for optimising power consumption in transistor amplifiers. The method comprises the step of adapting the amplifier characteristics of the transistor by adapting the bias impedance at t...
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WO/2003/079536A2 |
A transmitter arrangement is disclosed in which a step-up frequency mixer (7), which converts a modulation signal into a transmission frequency range, is arranged within a phase lock loop PLL (10). The phase lock loop (10) comprises a fr...
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WO/2003/079563A1 |
Disclosed is a frequency doubling circuit arrangement which supplies a signal that has been received at one input (1) to the output (2) thereof at a doubled frequency. A rectifier (3) that couples the input (1) to the output (2) rectifie...
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WO/2003/079537A2 |
Disclosed is a frequency converting circuit arrangement (14) supplying a complex-valued output signal at the output (2) thereof. Said circuit comprises two frequency mixers (3, 4) which are respectively triggered by an input signal and a...
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WO/2003/075632A2 |
An RF amplifier system (10) includes an RF power amplifier (14), a coupler (18), a digital signal analysis circuit (20), a an interface (22). The RF power amplifier (14) has an RF output. The coupler is coupled to the RF power amplifier ...
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WO/2003/077490A1 |
Pseudo-noise (PN) carrier suppression up-converter and pseudo-noise image sideband rejection up-converter and down-converter circuits are provided. The image sideband rejection circuits enable the use of single step up-conversion without...
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WO/2003/077489A1 |
A resonant power converter (220) for ultra-efficient radio frequency transmission and associated methods is disclosed. In one exemplary embodiment, the invention is digitally actuated and uses a combination of a noise-shaped encoder (222...
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WO/2003/075529A1 |
Method and apparatus for providing an amplified modulated radio frequency signal, the method comprising the steps of providing a radio frequency (RF) oscillatory signal, generating from the RF oscillatory signal and an input signal a pai...
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WO/2003/073601A2 |
Disclosed is a PLL circuit (1) which is tuned to a first frequency by means of a digital modulation signal (28) and then to a second frequency by deactivating the digital modulation signal (28). A difference signal (32) that is character...
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WO/2003/073600A1 |
An oscillator (1083) having a modulation function capable of controlling a frequency by adding a signal to a control signal and a PLL (108A) circuit using the same, wherein the oscillator forms a ring (200) comprised of a plurality of ca...
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WO/2003/071755A1 |
A first, a second, and a third pair of DC voltages are successively calculated so that a modulation signal has a predetermined reference level when the level of I, Q signals supplied to the quadrature modulator is “0”. According to t...
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WO/2003/069772A2 |
A circuit and a method for converting base-band modulated in-phase and quadrate signals to an intermediate frequency centered real signal by: - dispersing spectra; - frequency up-shifting the dispersed spectra; and - mirroring the up-shi...
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WO/2003/069770A2 |
The invention relates to a point modulator (1) comprising a PLL circuit (2). A programmable frequency distributor (7) is arranged in the feedback branch of the PLL circuit (2), the control connection thereof being connected to a circuit ...
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WO/2003/065585A1 |
A wireless transceiver includes a transmitter having a harmonic rejection mixer and an RF output phase-locked loop in a two step up-conversion architecture, and a direct conversion receiver. The transmitter includes a local oscillator fo...
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WO/2003/061108A1 |
A VCO circuit for a fractional−n PLL circuit is described for implementing a direct modulation scheme. An embodiment of the invention provides a bank of switchable capacitors used to stringently control the gain of the VCO (KVCO). The ...
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WO/2003/052936A1 |
The present invention relates to apparatus for providing a stable and adjustable output frequency that can be modulated. The invention includes a frequency lock loop (1) with a frequency discriminator (2) that determines a frequency erro...
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WO/2003/052937A1 |
A low noise sinusoidal signal at a desired output frequency is synchronised using a first variable frequency oscillator (1) and providing a feedback control loop around the first oscillator (1) to generate a feedback control signal in su...
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WO/2003/047088A2 |
In a device (1) with a circuit (2) for generating a modulated signal (S) is provided a modulation device (9; 59) which is intended to receive a data signal (DS) and generate the modulated signal (S) as a function of the data signal (DS) ...
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WO/2003/047089A1 |
A remodulator timing signal (35) is generated by a phase locked loop (33) which is coupled to a broadcast vestigial sideband signal (5). Within the signal (5) is highly accurate timing data which is coupled to a demodulator (31). Timing ...
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WO/2003/043179A2 |
A transmitter chain has a quadrature modulator, a variable gain amplifier, an up-converter, and a variable gain power amplifier. An overall phase of the transmitter chain is adjusted on the basis of pre-stored phase information reflectin...
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WO/2003/043319A1 |
An RF system integrated with an RF switching unit and an RF modulator unit. In accordance with the present invention, it is provided the RF system including a plurality of antenna, an RF unit and a digital tuner and demodulator unit, inc...
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WO/2003/043208A1 |
A plurality of bands share an orthogonal modulation circuit for modulating two oscillation frequency signals having phases shifted by 90 degrees by using transmission data (I, Q). As an output load of the orthogonal modulation circuit, a...
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WO/2003/036789A2 |
An amplifying circuit for generating a radio frequency modulated output signal carrying an amplitude-modulated signal, the amplifying circuit including: a first modulator for accepting a first I/Q component signal Il,Q1 and a carrier sig...
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WO/2003/032493A2 |
A PLL circuit (1) is tuned to a first frequency (F¿1?) by using a first digital modulation signal (6) and is subsequently tuned to a second frequency (F¿2?) by using a second digital modulation signal (6'). A differential signal (9'), ...
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WO/2003/032597A1 |
Digital transmission using existing amplitude modulation transmitters (AM) results in transmissions in undesired boundary zones. This results from the fact that the two signals, the A signal and the RF-P signal, formed from the digital m...
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WO/2003/028218A1 |
In a fractional-N frequency synthesizer (710,720,730), a circuit (730) for generating at least one off-axis zero (725) in an equation representative of the circuit.
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WO/2003/023948A2 |
Disclosed is a transmitter arrangement, especially for mobile radio, comprising a quadrature modulator (1) with an upstream digital signal processing unit (2). In order to curb sideband and carrier frequency which can occur as a result o...
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WO/2003/021787A1 |
The present invention is a frequency synthesis technique using in combination within a frequency synthesis loop a Sigma-Delta Modular (SDM) based synthesizer and an SDM-based frequency digitizer. Since both blocks are SDM-based, the resu...
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WO/2003/019769A2 |
The invention relates to a transmitter system, especially for cellular telephony, which modulates a modulation signal (cos $g(v)¿m?t, sin $g(v)¿m?t) onto a low-frequency carrier signal (cos 1/3$g(v)t, sin 1/3$g(v)t) using two intermedi...
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WO/2003/017516A1 |
The present invention relates in general to a method, apparatus, and article of manufacture for providing high-speed digital communications (901, 902) through a communications channel (100). In one aspect, the present invention employs a...
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WO/2003/017507A2 |
An oscillator signal having a first frequency is generated. A frequency-doubled modulated output signal is produced from the oscillator signal, the frequency-doubled modulated output signal modulated according to a modulation signal and ...
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WO/2003/015258A2 |
Frequency modulation switching apparatus for rapidly increasing and decreasing the frequency within radio-frequency pulses of radio wave pulse trains transmitted by an antenna having series inductance and capacitance, the apparatus havin...
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WO/2003/013093A2 |
This application relates to the processing of modulated signals, which do not have constant envelopes (e.g. QAM or multicarrier signals). In particular, the dynamic range of such signals is addressed, so as to allow the use of S−class ...
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WO/2003/012979A1 |
A signal-balancing method an apparatus (fig. 6) including analyzing imbalance conditions of an I-Q network (604), deriving a set of coefficients from the analyzed imbalanced conditions (604), and decomposing time domain samples of an inp...
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WO/2003/013191A2 |
The invention relates to a method for compensating a phase error in a receiver and/or transmitter system with I and Q processing branches. The phase corrected I and Q signal components are calculated in a calculating stage (PC) in a digi...
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WO/2003/012977A2 |
A circuit arrangement for the regulation of a direct component of a signal is disclosed, connected to an input of a frequency mixer (1). The regulation comprises a common-mode signal component detector (5), which supplies the direct comp...
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WO/2003/006103A2 |
Methods of identifying activators and inhibitors of voltage-gated ion channels are provided in which the methods employ electrical field stimulation of the cells in order to manipulate the open/close state transition of the voltage-gated...
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WO/2003/007478A2 |
The invention relates to a method for producing mobile radio signals using a DDS (12) (direct digital frequency synthesis) and a modulator (14), comprising the following steps: A) an intermediate frequency (f¿out-DDS?) is produced by co...
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WO/2003/001759A2 |
Cycle-by-cycle synchronous waveform shaping is provided for by filtering and combining of square and/or impulse shaped signals. Specifically, a plurality of first square shaped signals is generated and filtered using at least one first f...
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WO/2002/101916A2 |
The invention provides a method and a device for amplitude modulation of a radio frequency signal using a variable-gain radio frequency power amplifier (PA), for automatic control of the amplifier (PA) output signal (G) by generating an ...
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WO/2002/099961A2 |
The invention relates to a two-point modulator (1) comprising a PLL circuit (2). Said two-point modulator (1) comprises a first circuit branch for injecting an analog modulation signal (17) into a first point of the PLL circuit (2), and ...
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