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WO/2003/065574A2 |
A variable impedance load (104) is provided at the output of a radio frequency (RF) driver amplifier (102) having a variable gain. In an exemplary embodiment, the variable load (104) comprises a resistor (R) in series with a semiconducto...
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WO/2003/065578A1 |
An active filter comprising a first operational amplifier (10) disposed in an inverting integral configuration through a feedback capacitor (14) and a main resistor (15), and a divider (20) connected through a first connecting terminal (...
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WO/2003/063349A1 |
An N-shaped nonlinear resistor circuit using floating gate MOSFETs to realize a variety of N-shaped characteristics that can be approximated by piecewise linear functions of third to seventh orders and further to realize N-shaped V-I cha...
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WO/2003/061120A1 |
A small-sized, wideband phase shifting circuit and phase shifter comprising a capacitor; a switching element exhibiting a capacitance during OFF state; and a series circuit constituted by an inductor series connected to the switching ele...
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WO/2003/061121A1 |
The invention concerns a low-pass filtering device (600) used on a telephone line (L) consisting of a first transmission line (601) and a second transmission line (602), capable of circulating simultaneously, between a telephone exchange...
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WO/2003/058791A2 |
An active EMI filter for reducing common mode current in a circuit comprising: a transistor switching stage (Q1, Q2) coupled across a DC bus, a current sensor (CT) coupled to the DC bus for sensing the common mode current flowing in the ...
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WO/2003/056700A1 |
A balanced gyrator comprises interconnected pairs of single-ended inverting class AB transconductors (TC1 to TC4) fabricated from MOSFETs together with common mode feedback circuits (26) connected between balanced inputs (18,19) and outp...
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WO/2003/056711A1 |
A noise filter circuit that is integrally molded on a semiconductor substrate and improves the precision of filtering out noise components. The noise filter circuit comprises a high−pass filter for detecting noise components included i...
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WO/2003/055064A1 |
The invention relates to an analogue system of generating quadrature signals. The inventive system comprises: a) a first analogue frequency divider; and b) a second analogue frequency divider. Each of said dividers is supplied respective...
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WO/2003/052861A1 |
An apparatus comprising a quadrature network (152), an RF combining circuit (154) and a weighting network (156). The quadrature network (152) may be configured to generate a first and a second signal in response to an input signal. The R...
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WO/2003/038994A1 |
A balanced transconductor having a pair of voltage inputs and a pair of current outputs comprises a pair of single-ended transconductors, one in each signal path and a cancellation network. The cancellation network cancels at the inputs ...
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WO/2003/038998A1 |
A compact shifter is provided adapted to change the phase of signal fed to the input port of such phase shifter 180 degrees as such signal passes through the phase shifter in response to a logic state change in a binary control signal fe...
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WO/2003/032515A1 |
In a line driver/receiver circuit where the line driver (3) is connected with its output terminals to a load (ZL) for supplying a transmit signal thereto and where the receiver (2) is connected with its input terminals to the load (ZL) f...
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WO/2003/025512A2 |
Various components of the present invention are collectively designated as Analysis of Variables Through Analog Representation (AVATAR). It is a method, processes, and apparatus for measurement and analysis of variables of different type...
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WO/2003/023958A1 |
An active tunable filter circuit for use as an integratable active filter in a mobile radio apparatus, comprises an active amplifier circuit (A) including a reactive feedback network including a first tunable element (L1) set to pass wit...
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WO/2003/021777A1 |
The invention discloses a new and original voltage variable resistor VVR with input and output ports and a first input and second input for control signals to set the impedance between the input and output ports as desired over a certain...
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WO/2003/019778A1 |
The present invention provides a circuit arrangement to convert fixed, or grounded resistors, to floating resistors. In particular, the circuit arrangement provides for the coupling of active electrical resistance devices to provide a re...
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WO/2003/017483A1 |
The present invention relates to a tunable quadrature phase shifter comprising an input (IN) for inputting an input signal (vin), splitting means (10) for splitting the input signal into two essentially orthogonal first and second signal...
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WO/2003/015267A1 |
Integrated RC filter comprising a first resistor being coupled to a first capacitor through a first node, a signal input of said integrated RC filter being coupled through one of the first resistor and the first capacitor to the first no...
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WO/2003/015268A2 |
Analog FIR-filter comprising an asynchronous $g(S)Δ modulator (AM) generating amplitude-discrete time-continuous pulses, a sequence of delay cells (C¿1? ... C¿n?) for delaying said amplitude-discrete time-continuous pulses and means (...
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WO2002073798B1 |
A phase shifter comprises a coarse phase tuning arrangement and a fine phase tuningarrangement. The coarse phase tuning arrangement provides a discrete number of phase shifts. The fine phase tuning arrangement includes a RLC network, hav...
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WO/2003/012997A1 |
An output stage 300 includes a first output switch 201 having a current path for driving an output from a first voltage rail and a second output switch 202 having a current path for selectively driving the output from a second voltage ra...
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WO2002017477B1 |
With the rising popularity in wireless personal communication systems (PCS), there is a need for low-power, low-cost radio receivers. Low cost can be achieved by integrating the required functions as much as possible, thus minimizing the...
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WO2002087462A9 |
There is described a low-corner frequency high pass filter circuit comprising: an operational amplifier (12) having an inverting input (14), a non-inverting input (24) and an ouput (22), a series capacitor (26) having a first end connect...
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WO/2003/010889A1 |
An active inductor circuit having a high Q value and an LC oscillating circuit are disclosed. An inductor transistor circuit composed of a combination of two phase−shifting circuits including resistors (11, 13) and capacitors (12, 14)....
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WO/2003/005583A2 |
The reconfigurable analog cell according to the invention comprises admittances yab having first terminals (a) which are coupled to first terminals SW1 of a first plurality of switches, and having second terminals which are coupled to th...
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WO/2003/005578A1 |
The present invention relates to an active common-mode EMI filter which is capable of using low-voltage amplifier devices by using a separate amplifier dc source unrelated to the system operating voltage and also is capable of circulatin...
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WO/2003/003575A1 |
A low−noise active RC signal processing circuit having a transfer function the loop gain of which is varied so that the transmission gain of the negative feedback over the entire frequency band is below the forward gain, a low−Q−el...
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WO/2003/001678A1 |
A delta filter for use in a protective relay which includes an input circuit (50) for receiving phasor signals (V) representative of electrical signal quantities on the power line. A difference value, if any, is determined between the ph...
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WO/2003/001660A1 |
The invention provides an amplifier circuit made by digital CMOS processes, the amplifier circuit comprising a main operational amplifier with at least one input and at least one output and a feedback loop including a non-linear gateoxid...
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WO/2002/103901A1 |
The present invention relates to an active filter for suppressing noise and inter-modulation. The filter has at least one impedance circuitry (Z: 10; 34; 50; 69; 78), such as at least one resonator and/or at least one reactive component....
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WO/2002/097938A2 |
The present invention is an electronic isolator (210) that provides low input to output insertion loss, high output to input insertion loss, and substantial asymmetric isolation between a source circuit (200) and a load circuit (220). Th...
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WO2002056558A9 |
Techniques are provided for the implementation of a signal processing circuit (100) which expands the dynamic range of the signal processing circuit (100) without interrupting the output of the circuit. The techniques can receive an inpu...
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WO/2002/097985A1 |
The invention relates to a circuit arrangement, the use of such a circuit arrangement, and a method for control of a deviation of a time constant of analog filters, in particular high pass filters, low pass filters, and band pass filters...
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WO/2002/093743A1 |
A phase shifter comprising an FET (2a) having a drain electrode connected with an I&sol O terminal (1a), an FET (2b) having a drain electrode connected with the source electrode of the FET (2a) and a source electrode connected with an I&...
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WO/2002/093742A1 |
A filter for processing frequency signals, preferably received, particularly digital television signals is described, which filter comprises a Chebyshev filter (11, 12), a subsequent all-pass filter (13) and a control device (14 to 20) f...
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WO/2002/091573A1 |
The invention relates to an adjustable filter (1), in particular for use as an anti-aliasing filter in digital telecommunications networks. For precise tuning to a specific cut-off frequency, said filter comprises adjustable capacitances...
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WO/2002/087462A2 |
There is described a low-corner frequency high pass filter circuit comprising: an operational amplifier (12) having an inverting input (14), a non-inverting input (24) and an ouput (22), a series capacitor (26) having a first end connect...
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WO/2002/087071A2 |
Tuneable resonance amplifier comprising a cascade circuit of first and second sections each having a controllable gain and comprising first and second transconductance amplifiers, respectively, outputs of which are coupled via first and ...
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WO/2002/084868A1 |
A tunable low noise amplifier matching circuit is provided. The matching circuit includes a fero-electric tunable component. A control signal is applied to the tunable component, changing the component's impedance. This changes the imped...
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WO/2002/084869A1 |
A power amplifier matching circuit is provided. The matching circuit includes a ferro-electric tunable component. A control signal is applied to the tunable component, changing the component's impedance. This changes the impedance of the...
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WO2001054273A9 |
An active termination for a transmission line comprising a reference impedance, a terminating impedance and a control circuit. The reference and terminating impedances are identical circuits made on the same integrated circuit in close p...
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WO/2002/082649A1 |
A delay circuit is provided for use in a ring oscillator of a phase locked loop (PLLC). The delay circuit includes a differential pair of NMOS transistors 102 and 103 with an NMOS transistor 101 providing the tail current for the differe...
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WO/2002/075922A2 |
A circuit (71) and method for input side (84) impedance matching of a power amplifier (76) in an electronic device. Specifically, the present invention provides an impedance transformer network (50) that includes a negative resistor (52)...
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WO/2002/073801A1 |
The invention relates to a trimming of analogue filters (201) in integrated circuits by means of an automatic adjusting circuit. A local osciallator (202) in the automatic adjusting circuit provides a periodic reference signal (R) to an ...
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WO/2002/071621A2 |
A hybrid loop filter includes an integrator having an input and an output wherein the output forms an output of the hybrid loop filter, a plurality of transconductance amplifiers having an input and an output wherein each output of the p...
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WO/2002/065639A1 |
A LC controllable oscillator (LCCO) according to the invention comprises a voltage-controlled oscillator VCO (102) and a first voltage controlled current source VCCS (101) of a first type for supplying a current to the VCO. The VCO is re...
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WO/2002/065638A1 |
The present invention relates to a tunable quadrature phase shifter comprising an input (IN) for inputting an input signal (vin), splitting means (10) for splitting the input signal into two essentially orthogonal first and second signal...
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WO/2002/063768A1 |
Techniques are provided for the implementation of dynamically biased circuits. In these circuits, bias currents are varied according to signal amplitude. Benefits include reduced power dissipation, reduced noise, and increased dynamic ra...
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WO2001028310A9 |
In one embodiment. a transceiver described and disclosed in the specification and drawings, and a local oscillator (LO) generator, a controller, and a self-test unit. All of these components are packaged for integration into a single IC,...
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