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WO/2001/054267A1 |
A radio FM receiver is provided with a voltage-controlled oscillator which can be connected via a frequency 2-divider to a quadrature combination circuit for transforming down the frequencies of received radio signals and for supplying q...
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WO/2001/054266A2 |
The invention relates to a mixer circuit and to a method for mixing signals with a MOSFET transistor that has a drain, a gate, a substrate or a body and source connection, wherein the signals to be mixed and the output signal have each t...
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WO/2001/052452A1 |
The present invention provides a high speed wireless link suitable for the transmission of high bit rate digital data over UHF and microwave frequencies, including the PCS band. Digital data is transmitted over an RF carrier wave by modu...
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WO/2001/052431A1 |
A radio-frequency (RF) front-end comprises a low noise amplifier LNA (105), a first mixer (106) and an I/Q quadrature mixer (108). The LNA amplifies a received signal at a carrier frequency, the LNA having inductive loads (112). The firs...
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WO/2001/052420A1 |
A programmable digital divider operates under the control of a division controller to derive a second synthesized frequency based on a first synthesized frequency. The programmable divider divides the first synthesized signal to derive t...
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WO/2001/052427A1 |
A transmitter in which the problem of unwanted spurious signals due to harmonics of the output signal from a frequency synthesizer and due to mixture of harmonics of the output signal from a crystal oscillator into a VCO and which facili...
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WO/2001/050593A1 |
Quadrature signals are produced from received FSK. The quadrature signals are differentiated (550, 552) and combined (570), producing a phase signal having a phase signal velocity. A phase analysis circuit (570) analyzes the phase signal...
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WO/2001/048909A2 |
Radio receivers are known in the art. A conventional receiver requires external components for RF/image selectivity, IF selectivity and demodulation.Other solutions are for example a number of correction algorithms, which is an expensive...
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WO/2001/047202A2 |
Systems and methods for utilizing universal frequency translators for phase detection and/or frequency detection. Phase and/or frequency detection can be utilized for comparing a higher frequency reference signal with a lower frequency l...
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WO/2001/047101A1 |
The invention relates to an oscillator circuit and a mixer circuit that, in part, contain the same components. The mixer circuit comprises at least two switch elements. The outputs of said switch elements are each coupled in a crosswise ...
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WO/2001/047261A1 |
An upconverter unit for a cable television system upconverts multiple channel signals from a common intermediate frequency to a VHF or UHF signal ready for transmission to subscribers. The two-stage upconverter provides a first stage in ...
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WO2000042659A9 |
An integrated circuit ESD protection system comprises: a local power supply bus, a local ground bus, a first local ESD clamp, and ESD ground bus disposed between local power supply and ground busses and coupled to the local power supply ...
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WO/2001/043295A2 |
An image reject circuit comprises a local oscillator (26) for producing a local oscillator signal. A tunable phase shifting network (29) has inputs (1, 3) for receiving the local oscillator signal and producing an output in-phase (I) sig...
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WO/2001/043275A2 |
The invention relates to a circuit configuration for direct modulation that comprises an oscillator (1) whose output signal is split into quadrature components (LOI, LOQ) for modulation with the useful signal. A circuit (10) used for fre...
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WO/2001/039364A1 |
A novel technique for the implementation of a single chip navigation/location receiver is disclosed. For example, the receiver derives GPS and GLONAS signals without requiring any external RF image rejection filtering or IF channel selec...
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WO/2001/039362A2 |
The mixer circuit is a singled ended input to a double balanced high dynamic range mixer with only two base-emitter junctions across the supply. It provides for the use of bondwires to off chip ground as DC block and DC feed elements. Th...
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WO/2001/039372A1 |
The invention is an improved implementation of an active-RC polyphase band-pass filter with transconductor cross-coupling between filter sections. The polyphase filter has first to fourth inputs, first to fourth outputs, two filter secti...
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WO/2001/039385A1 |
A polyphase receiver comprises an RF front end (10 to 28) for receiving a wanted data signal modulated on a carrier signal and for producing quadrature related low IF signals, an image rejection filter formed by a polyphase filter (30) f...
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WO/2001/039363A1 |
A superhet receiver with quadrature IF and improved demodulator is configured to recover a modulated signal from a low IF in a radio receiver. A superhet receiver receives an FM radio-frequency signal, converts the input RF signal to an ...
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WO/2001/039361A2 |
A universal frequency translation module (UFT) frequency translates an electromagnetic (EM) input signal by sampling the EM input signal according to a periodic control signal (also called on aliasing signal). By controlling the relative...
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WO/2001/037430A1 |
The invention relates to a method and an arrangement implementing the method for implementing the transmitter operation of a digital data transmission system. The method comprises the steps of converting an information signal to be trans...
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WO/2001/035538A2 |
A low spurious frequency offset homodyne receiver that includes an SSB modulator (22) that shifts the frequency of the input signal and whose output is input into an IRM. An oscillator drives the LO port of the SSB (4). The use of an Ima...
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WO/2001/033828A2 |
An improved digital phase detector is provided for detecting and compensating for a cycle slip between a reference signal and a frequency source signal, the reference and frequency source signals each comprising pulses, each pulse define...
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WO/2001/031776A2 |
The invention concerns a device for demodulating a modulated signal resulting from an amplitude modulation of a sinusoidal signal of frequency f¿o? by a signal of frequency f¿m? according to an unknown modulation rate, comprising a tra...
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WO/2001/031798A1 |
A communications terminal having a receiver and a method therefor is provided that substantially removes a known interferer from a digitally translated intermediate frequency signal. More specifically, the receiver includes an antenna fo...
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WO/2001/026214A2 |
A balanced transmitter up-converts a baseband signal directly from baseband-to-RF. The up-conversion process is sufficiently linear that no IF processing is required, even in communications applications that have stringent requirements o...
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WO/2001/026215A2 |
Methods, systems, and apparatuses for down-converting an electromagnetic (EM) signal by aliasing the EM signal, and applications thereof are described herein. Reducing or eliminating DC offset voltages and re-radiation generated when dow...
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WO/2001/024390A1 |
The DC offset, I/Q level ratio, disorder of I/Q orthogonality, out-of-synchronization, phase rotation due to difference between feed lines which are factors of waveform distortion fixedly added to the received signal are all compensated ...
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WO/2001/024357A1 |
A method is described that involves combining (750) a sigma delta modulator output signal (710) with a second signal (715) to form a third signal that controls the division performed by a divider (706). An apparatus that can execute the ...
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WO/2001/024420A1 |
A method that involves demodulating a received wireless signal with a demodulator (106). Then, tapping a tapped receive signal (311) from the demodulator (106). Then, measuring a frequency of the tapped receive signal (311). An apparatus...
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WO/2001/024358A1 |
A system and method for a single conversion tuner which generally uses phase shifted in-phase and quadrature-phase signal paths as an image rejection circuit. Through the use of broadband input LNA and mixer circuits, substantially the e...
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WO2000054421A9 |
A radio terminal device comprises an antenna (10), a transmitter circuit (11), a direct conversion receiver circuit (12), a circulator (13), and a band-rejection filter (14). A direct conversion receiver circuit (12) is smaller in size t...
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WO/2001/022634A1 |
A coder (101) codes transmission data, and a modulator (102) modulates the output signal from the coder (101). A coder (103) codes a pilot signal, and a modulator (104) subjects the output signal from the coder (103) to primary modulatio...
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WO/2001/022571A1 |
An apparatus and method are provided that compensates for the problematic time-varying DC offset by effectively eliminating a near-channel amplitude modulated interferer from a signal. The apparatus includes a first channel estimator (30...
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WO/2001/020795A2 |
To address problems associated with interference in a received signal of a direct conversion receiver within a transceiver, an error estimator is employed to reduce errors induced on the baseband of the received signal. Knowledge that th...
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WO/2001/020350A1 |
The invention relates to a phase detector, comprising at least two diodes (V1, V2), connected in series, to which a reference signal (U1) is supplied via a transformer (UT). In addition, the diodes (V1, V2) are connected to a decoupling ...
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WO/2001/020791A1 |
A method for producing an output signal (42) with a specific frequency from an input signal (40) received, the frequency of which changes quickly in steps of the size of an input frequency resolution or a multiple of the input frequency ...
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WO/2001/018955A1 |
A method and apparatus for generating microwave signal frequencies. An incident reference signal is provided. A first stimulus signal is also provided, the first stimulus signal having a first polarization and having a first predetermine...
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WO/2001/018953A2 |
A mixing apparatus includes a Gilbert cell connected to a first load and a second load. In one embodiment each load contains transistors that are configured as a diode and a triode, where these circuits are additively combined to achieve...
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WO/2001/019047A1 |
A phase interpolation receiver for receiving angle modulated radio frequency signals. The receiver comprises mixers for down-converting the received angle modulated signal to lower frequency signals, limiters, interpolation filters, and ...
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WO/2001/018954A1 |
A system is provided for down-converting a narrow band signal that includes a polyphase filter having a specified number of filter branches. The polyphase filter is operable to decimate the signal by a decimation factor based on the spec...
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WO/2001/017121A1 |
This patent describes a method and system which overcomes the LO-leakage problem of direct conversion and similar RF transmitters. To solve this problem a virtual LO?TM¿ signal is generated within the baseband which is tuned to the inco...
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WO/2001/017120A2 |
This patent describes a method of removing the LO-leakage and 1/f noise problems associated with direct conversion RF receivers and other demodulators. In order to solve this problem a virtual LO?TM¿ signal is generated within the RF si...
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WO/2001/017122A1 |
This patent describes a method and system which overcomes the LO-leakage problem of direct conversion and similar RF transmitters and receivers. To solve this problem a virtual LO?TM¿ signal is generated which emulates mixing with a loc...
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WO/2001/015315A1 |
The invention aims to provide a method which significantly reduces a frequency offset in the base-station receiver, with the minimum effort possible. To this end, the reference frequency of the demodulator (UCD) in each subscriber statio...
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WO/2001/015317A1 |
A communications device (3) includes a frequency conversion circuit (12) and a control circuit (10). An antenna (2) receives a radio signal at a first frequency and converts it into a radio frequency (RF) signal of the first frequency. T...
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WO/2001/015432A2 |
The signal conversion of an image signal in an intermediate frequency position takes place using oversampling, followed by a digital filtration (2) and conversion into a complex-value digital signal. A two-stage frequency translation (3,...
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WO/2001/013517A2 |
A circuit arrangement of a loading pump with an additional reference stage (6), wherein the end stage (5) of the branches (1, 2) are reproduced, at least as far as the transistors (mn2, mp2) on the output side are concerned, whereby an e...
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WO/2001/011767A1 |
A transmitter (7102) includes a balanced modulator/up-converter (7104), a control signal generator (7142), an optional filter (7106) and an optional amplifier (7108). Transmitter (7102) up-converts a baseband signal (7110) to produce an ...
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WO/2001/011774A1 |
A Radio Frequency (RF) receiver (300) that receives (401) RF signals and mixes (403) signals from a local oscillator with the signals. The signal strength of the desire demodulated signals is maximized by adjusting (417) the phase of the...
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