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WO/2004/045064A1 |
A method and apparatus for measuring and controlling the phase difference or time difference between two signals is presented. In some embodiments two sample and hold (S/H) circuits are arranged as a cooperating system that alternately s...
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WO/2004/045076A1 |
A phase comparator, particularly for a PLL circuit, compares the phase angle of input signals by evaluating the edges of the input signals and generates a regulating signal. To make the regulating signal insensitive to disruptions or int...
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WO/2004/043062A1 |
The present invention is related to a device comprising a capacitive feedback transimpedance operational amplifier (11), that comprises a main operational amplifier (107) (with a first input (121), a second input (122) and an output (125...
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WO/2004/042945A1 |
A receiver of double conversion system wherein unwanted components included in received signals can be removed without fail and wherein the number of constituent parts has been reduced. The receiver comprises an antenna tuning circuit (1...
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WO/2004/042927A1 |
A Phase Locked Loop (1) used in a data and clock recovery comprising a frequency detector (10) including a quadricorrelator (2), the quadricorrelator (2) comprising a frequency detector including double edge clocked bi-stable circuits (2...
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WO/2004/042925A1 |
A Phase Locked Loop (1) comprising a frequency detector (10) including a balanced quadricorrelator (2), the loop (1) being characterized in that the quadricorrelator (2) comprises double edge clocked bi-stable circuits (21, 22, 23, 24, 2...
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WO/2004/040749A1 |
The invention relates to a demodulator to demodulate frequency-modulated signals FM including a phase locked loop PLL including at least a phase detector, a loop filter and a voltage controlled oscillator function VCO', characterized in ...
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WO2004021589A9 |
An apparatus for coarse compensation of a direct current (DC) offset in a direct to baseband receiver architecture utilizes a serial analog to digital converter (ADC), such as a Delta-Sigma converter, to convert the received signal to di...
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WO/2004/038939A1 |
Disclosed is a method and apparatus for removing DC offsets in a ZIF radio device, the method including the steps of converting a signal to digital samples, calculating a DC burst by capturing an entire burst and a portion of the adjacen...
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WO/2004/036776A1 |
The present invention relates generally to communications, and more specifically to a method and apparatus for minimizing DC offset and second-order modulation products (IM2 noise) while demodulating RF signals. The principle of the inve...
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WO/2004/034572A1 |
When a sample stream is decimated, frequency components from outside of a desired frequency band are aliased into the desired band, causing interference and loss of information. Different decimating ratios result in different frequencies...
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WO/2004/030300A1 |
The invention relates to a method and a circuit arrangement for demodulating a digital amplitude-modulated radio signal received by a receiver (1), said signal comprising a carrier signal and a digital transmission signal that is impress...
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WO/2004/030205A1 |
A start signal output circuit has a differential RF/DC converting section (100) for converting high-frequency power (RF) into a DC potential (DC). The RG/DC converting section (100) is composed of two transistors (QRD, QDD) acting as dio...
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WO/2004/027980A1 |
An integrated demodulator and decimator circuit (700, 800) including a selective digital sign inverter (703, 803) and a decimator (705, 805). The sign inverter negates selected digital samples based on Weaver demodulation and outputs dem...
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WO/2004/025826A1 |
The invention relates to a receiving method and a direct conversion receiver. The receiver comprises a mixer (308) for mixing a received signal into a base band signal comprising I and Q branches, and an A/D converter (316) for convertin...
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WO/2004/025844A1 |
A first modulation at an arbitrary frequency and a second modulation at an arbitrary frequency. Demodulation (844) uses (838) the same reference oscillator signal as modulation (816, 820). Subsequent re-modulation (858) can be readily ac...
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WO/2004/023642A1 |
A receiver and its adjustment system and method that can reduce the effort and the cost required to give good characteristics. The receiver comprises a quadrature detector whose characteristic value is varied by adjusting the capacitance...
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WO/2004/023643A1 |
The invention relates to a circuit arrangement having a frequency converter, in which a frequency mixer (18, 19) is provided in a first direct current path and, together with a cascode transistor (13), forms a cascode circuit. An input t...
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WO/2004/023644A1 |
A first micro−width rectangular groove having a rectangular cross−section, and a second micro−width rectangular groove having a rectangular cross−section and being substantially orthogonal to the first micro−width rectangular g...
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WO/2004/023751A1 |
A sampling block (40a-1) uses a frequency, which is obtained by multiplying the frequency of an intermediate frequency signal (RIFs) by 1/(m + 0.25) or 1/(m + 0.75) where “m” is zero or a natural number, to sample the intermediate fr...
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WO/2004/023650A1 |
As an output amplifier of a frequency conversion circuit, it is possible to use a push-pull amplifier requiring little consumption current and capable of obtaining a high gain. The push-pull amplifier has a voltage drop circuit for lower...
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WO/2004/021584A2 |
A direct downconversion receiver combines a received RF signal and a local oscillator (LO) signal to form a combined signal. The local oscillator signal is also phase-shifted by approximately 90 degrees to form a quadrature signal. A mix...
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WO/2004/021574A1 |
A phase locked loop comprising a phase detector (100) for determining a phase difference between a reference signal (Ref) and mutually phase shifted signals (I, Q) to generate frequency control signals (U, D), the phase detector (100) co...
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WO/2004/021560A1 |
A circuit for establishing a bias current includes a mixer, an amplifier, a bias resistor, a comparator, and a drive circuit. The mixer receives a drive voltage and at least a portion of a bias current. The amplifier is coupled to the mi...
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WO/2004/021270A1 |
A method for regulating the input signal of a non-contact transponder is disclosed, whereby the signal strength of an amplitude-modulated input signal is regulated to a set value. On recognition of a modulation gap by the demodulation de...
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WO2001089092A9 |
An appparatus for radio frequency processing includes a local oscillator synthesizer circuit having a voltage controlled oscillator that generates an oscillator signal f1. A divide-by-N circuit receives the oscillator circuit f1 and divd...
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WO/2004/019653A2 |
A system using the nonlinearity of a propagation medium to demodulate an ultrasonic wave having audio modulated onto the ultrasonic frequency, audio signal processing circuitry providing a delayed audio signal and an envelope signal whic...
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WO/2004/019482A1 |
A mixer circuit for converting the frequency of an object signal by mixing the object signal and a local oscillation signal. The mixer circuit can stably operate even if the amplitude of the local oscillation signal varies because a pseu...
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WO/2004/015439A2 |
Apparatus (40) for processing an input signal (SRF (t)) with a carrier frequency (&ohgr RF) defining a desired band and at least a sideband being defined by a sideband frequency (n&ohgr LO) that is higher than the carrier frequency (&ohg...
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WO/2004/015853A1 |
The present invention concerns a digital imbalance correction device, comprising input means adapted to receive first input signals I-in, Q-in containing a plurality of channels from an I/Q converter stage at respective input terminals, ...
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WO/2004/013955A1 |
The invention relates to a receiver for receiving an analog signal having a spectrum situated in a given frequency band higher than the baseband. It comprises reception means which manage at least one narrow-band noise signal located aro...
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WO/2004/013956A1 |
Known phase detectors have feedbackloops and do not function properly under severe conditions. By providing said phase detectors with difference establishers (1) for establishing differences between input signals and with selectors (2) f...
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WO/2004/010574A1 |
The invention relates to VHF adapters for cable networks of the ODU type. It consists in using two conversion chains, up and down, in which a very stable single reference oscillator (403) drives means (404, 405, 410, 423) of generating t...
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WO/2004/010572A1 |
A digital receiver (10) automatically detects and non-coherently demodulates a multiplicity of interfering digitally modulated signals transmitted simultaneously at approximately the same carrier frequency. The receiver (10) includes one...
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WO/2004/008650A1 |
This invention is about the direct conversion receiver. It is excellent the receiving sensitivity that DC off-set, matching characteristics of the relationship of I/Q circuits and noise characteristics are improved. In order to achieve t...
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WO/2004/008629A1 |
Briefly, a method and apparatus to compensate for an imbalance of a demodulator by providing calibration parameters to a calibration network is provided. The apparatus may include a calibration network that may output an in-phase signal ...
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WO/2004/006433A1 |
A tuning arrangement with a polyphase low IF mixer, a polyphase low IF filter and a polyphase group delay equalizer. The polyphase group delay equalizer has only one or more pole-zero pairs in the upper half of the complex frequency plan...
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WO/2004/004147A1 |
A duplexerless homodyne receiver, suitable for use in a base station of a mobile communications system, is described. Received signals are supplied to a wideband filter, and the filtered signals are supplied to a first low noise amplifie...
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WO/2004/004266A2 |
The invention relates to a receiver device, especially for mobile radio, which enables the use of slow transient phase control circuits during a two-point connection of a two transmitter-receiver, also in a heterodyne receiver structure....
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WO/2004/004146A1 |
A direct conversion receiver comprises a low noise amplifier, a bandpass filter, a mixer circuit and a baseband processing assembly. The low noise amplifier is capable of receiving communication signals from an antenna and, in turn, the ...
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WO/2003/107615A1 |
A method and an arrangement for compensating for amplitude imbalance of a quadrature modulator comprising: means for determining a first correlation on the basis of a first modulation signal and an output signal of the quadrature modulat...
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WO/2003/105464A2 |
A television tuner is fully implemented on a monolithic integrated circuit. The television tuner includes a baseband SAWF function fully integrated in silicon. The SAWF function includes trap and bandpass filters. A video demodulation ci...
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WO2003041313B1 |
A cost effective digital stereo decoder (216) for Digitized Intermediate Frequency (DIF) FM radio receiver (100). After FM demodulation (212), a multiplex signal (MPX) at a high sampling rate is mixed with free-running local quadrature m...
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WO/2003/103131A2 |
An image rejection quadratic filter is tunable to filter image frequencies over a wide band. In one embodiment, the image rejection filter includes in-phase and quadrature phase mixers. The image rejection has a fractional transfer funct...
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WO/2003/103132A1 |
A television demodulator circuit, for use in a television receiver, generates baseband video and audio outputs from a television signal, such as an intermediate frequency television signal. The I, Q demodulator circuit mixes the televisi...
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WO/2003/101064A1 |
A method for determining IQ imbalance introduced on an RF multicarrier signal received via a channel on a direct conversion analog receiver, comprising the steps of: receiving a training signal on said receiver; demodulating the training...
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WO/2003/100962A2 |
A mixer suitable for implementation in low voltage, low power CMOS employs a class AB transconductor to achieve analogue multiplication through simultaneous modulation of both the transconductor input and its internal voltage rail.
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WO/2003/100963A1 |
Methods and devices relating to radio applications. An input signal with an input frequency is fed into a double quadrature mixer circuit along with a local oscillator signal with a local oscillator frequency. These two signals are multi...
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WO/2003/098821A1 |
A multi-channel RF receiver uses an image rejection mixer (e.g. double quadrature mixer) in the IF down conversion stage for image side band rejection (whereby use of an IF narrow band filter for image rejection may be omitted if desired...
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WO/2003/098794A1 |
Disclosed is a substrate of a step-up frequency converter comprising a first and a second input for two input signals (IF, LO1) that are to be mixed, the first input signal (IF) having a lower frequency than the second input signal (LO),...
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