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WO/2002/060055A1 |
A filter (3) is described, which filter is provided with field effect (FET) capacitors (M1-32; M"1-32) arranged for controlling their respective capacity values, each such FET capacitor (M1-32; M"1-32) having a source (S) and a drain (D)...
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WO/2002/060085A2 |
The invention relates to a filter arrangement for connecting complex terminating impedances to a signal source (1), comprising a standard filter configured for a specific real terminating impedance (4), a first adapting impedance (5, 6) ...
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WO/2002/060059A2 |
A circuit implemented in a MOS device for operation with an internally non-linear topology, the circuit including at least first and second voltage ports, at least one voltage comparator for comparing the voltage at at least one of the v...
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WO/2002/058236A1 |
The invention relates to an electronic filter circuit comprising a controllable transconductance circuit wherein a feedback loop is added to a substantially linear transconductance amplifier G, between two electronic leads having an inpu...
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WO/2002/056470A1 |
A signal processing system (100) comprises an input terminal (102), and a main path having a main filter input gain unit (126) coupled to said input terminal (102), a main filter (132) and an output gain unit (138). An auxiliary path inc...
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WO/2002/056467A1 |
The invention provides a small phase shifter and a small multibit phase shifter, in which a filter including a capacitor formed during pinchoff of a FET is used to shift phases depending on the ON/OFF operation of the FET. The phase shif...
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WO/2002/047296A1 |
An analog filter comprises first and second arithmetic operation sections (2¿-1?, 2¿-2?) connected in series and each composed of processing circuits connetected in series. Each processing circuit includes an S/H circuit of plural stag...
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WO/2002/045264A2 |
An approach for impedance matching a transmission line includes using the actual line impedance. According to one example embodiment, the impedance of a line (10) connecting first and second nodes is calibrated by first driving the line ...
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WO/2002/045283A2 |
A direct conversion satellite tuner is fully integrated on a common substrate. The integrated tuner receives an RF signal having a plurality of channels and down-converts a selected channel directly to baseband for further processing. Th...
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WO/2002/041442A1 |
The present invention relates to a distribution network which is an active power spiltter 1 to 2 (FC1A) or active power combiner 2 to 1 (FC+B) or alternatingly can be such a power splitter and such a poer combiner, said power splitter co...
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WO/2002/035756A2 |
An active filter (100) is disclosed with improved blocker signal rejection characteristics. Linear resistors, such as fixed value resistors (3, 4) are used at the input stage (72) of the filter (100) to suppress any blocker signal. A gai...
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WO/2002/033812A2 |
The present invention is directed to advantages discovered in connection with controlling DC current passing between and adversely affecting cascaded current-mode blocks. According to a particular example application, the present inventi...
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WO/2002/031976A1 |
A filter is constituted by comprising a capacitor (1) connected between the input end IN and the output end OUT of signals and constant current circuits (2, 3) of MOS structure connected between the power source VDD and the ground, and b...
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WO/2002/023723A1 |
A G¿m?C filter (300) that suppresses unwanted signals generated by a G¿m?C compression stage (C1, 302). The G¿m?C filter (300) utilizes the same compression stages (304, 306) for the decompression stages. By using the same compression...
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WO/2002/017485A1 |
A $g(p)/2 phase shifter generates first and second signals (SIGa, SIGb) of equal amplitude and different phases and first and second inverted signals (/SIGa, /SIGb) whose phases are opposite to those of the first and second signals, depe...
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WO/2002/012843A2 |
A transducer circuit, method, and system for conversion of a high-impedance, broad frequency range signal from a sensor into two low-impedance signals, one containing high-frequency components and another containing low-frequency compone...
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WO/2002/009268A1 |
An active power filter includes a feedback resistor (R4) and a shunt capacitor (C4), an operational amplifier equivalent subcircuit (ideal equivalent OA), and a voltage drop source (Vdrop). The shunt capacitor connects the positive termi...
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WO/2002/009288A1 |
A current-controlled FET resistor and a low supply, current-controlled FET Pi attenuator network are provided. The current-controlled FET resistor includes an FET having drain, source, and gate terminals, and a connection between the gat...
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WO/2002/005430A1 |
A dual FET differential voltage controlled attenuator includes a first voltage controlled FET transistor (M1), corresponding to a first control voltage terminal, and a second voltage controlled FET transistor (M2), corresponding to a sec...
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WO/2002/001860A1 |
A tuner section (2, 3) and at least an electronic volume control (4) are formed in the form of a CMOS structure and integrated in one semiconductor chip (10). Since more of audio-related components can be integrated into one chip, the nu...
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WO/2001/097321A1 |
A new type of frequency-tunable active notch filter (Fig. 3) achieves frequency selectivity through interaction among input derived signal components that are passed through parallel signal channels (301, 302, 303) in a forward-only dire...
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WO/2001/095507A2 |
In a first embodiment, the invention relates to an arrangement for operating a plurality of terminal devices (6) on a common antenna (4) with a switching network (2) comprising a first separating element (8) associated with the antenna (...
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WO/2001/095552A2 |
The invention relates to methods and apparatus that allow a comparison of phase between a clock signal (326) and a serial bitstream (320). A phase detector integrates a portion of a transition between adjacent or consecutive bits of the ...
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WO/2001/093429A2 |
A track and attenuate (T/A) circuit (20) for use with switched current source DACs (5) is connected across the DAC's differential current outputs (+I¿DAC?, -I¿DAC?). The T/A circuit includes three attenuate switches: first and second s...
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WO/2001/093491A2 |
A high frequency network transmitter receives a parallel input data stream and serializes the parallel input data stream for high speed transmission in a network. A phase alignment circuit aligns the parallel input data stream to a first...
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WO/2001/093422A1 |
An RF circuit configured to inteface a balanced port (1, 2, 11, 12) with an unbalanced port (4, 14) by emulating the function of a balun. Reactive components (20, 30, 120, 130) in both branches of a balanced circuit form two resonant cir...
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WO/2001/086807A1 |
The invention relates to a voltage-controlled capacitor which is configured in such a way that it contains two varactors connected in parallel. Said varactors are connected in such a way that the capacitor is controlled by differential s...
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WO/2001/082467A2 |
Several MEMS-based methods and architectures which utilize vibrating micromechanical resonators in circuits to implement filtering, mixing, frequency reference and amplifying functions are provided. A method and apparatus are shown for g...
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WO/2001/082476A2 |
Several MEMS-based methods and architectures which utilize vibrating micromechanical resonators in circuits to implement filtering, mixing, frequency reference and amplifying functions are provided. For example, a method and apparatus fo...
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WO/2001/082475A2 |
Several MEMS-based architectures which utilize vibrating micromechanical resonators in circuits to implement filtering, mixing, frequency reference and amplifying functions are provided. A method and apparatus are provided for upconverti...
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WO/2001/082477A2 |
Several MEMS-based methods and architectures which utilize vibrating micromechanical resonators in circuits to implement filtering, mixing, frequency reference and amplifying functions are provided. Apparatus is provided for filtering si...
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WO/2001/082479A2 |
Several MEMS-based methods and architectures which utilize vibrating micromechanical resonators in circuits to implement filtering, mixing, frequency reference and amplifying functions are provided. Apparatus is provided for selecting at...
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WO/2001/082478A2 |
Several MEMS-based methods and architectures which utilize vibrating micromechanical resonators in circuits to implement filtering, mixing, frequency reference and amplifying functions are provided. A method and subsystem are provided fo...
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WO/2001/069774A1 |
Resonator comprising first and second balanced integrators (I1, I2) each composed with a balanced amplifier and having a non-inverting (in+) and an inverting (in-) input terminal, as well as a non-inverting (out+) and an inverting (out-)...
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WO/2001/065691A2 |
Dynamic matching of a source impedance (204, 304) to a load impedance (240, 340). An embodiment of the invention is a device for active impedance matching comprising a voltage driver 410 having an output connected to a load (442), means ...
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WO/2001/065790A2 |
The invention concerns a power separating filter for high frequency digital data transmission channel and low frequency telephone analog signal channel, simultaneously transmitted on a subscriber loop comprising a two-wire telephone line...
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WO/2001/065690A1 |
A self-tracking bandpass filter (1) comprises a controllable filter (10) having a signal input (11) for receiving a signal ($g(f)) to be filtered, a bandpass output (13) for providing a bandpass signal (S¿BP?) having a center frequency ...
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WO/2001/063760A1 |
The invention produces an accurate quadrature relationship for a range of frequencies using passive components in the primary quadrature splitting circuits. A reference oscillator (202) generates a reference signal which is fed to a conv...
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WO/2001/061849A2 |
A programmable capacitor array including a plurality of user-selectable, numerically weighted capacitors, each of which includes at least one fixed capacitor and one manufacturer-controlled trim capacitor, advantageously provides a varie...
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WO/2001/059928A1 |
The invention relates to a balanced circuit arrangement for converting an asymmetric analogous input signal (S1) into a symmetrical output signal (S2, S3). A first amplifier (2) is provided, whereby the non-inverting input thereof is con...
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WO/2001/059925A1 |
Wireless communications devices must handle a wide range of useful signal levels and must also cope with large interfering signals of nearby frequencies. They often use transconductance amplifiers/filters as building blocks as such ampli...
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WO/2001/056157A1 |
A band pass filter (80) includes a pair of filters (82, 83) having different center frequencies and a difference amplifier (84) coupled to the outputs of the filters. The filters preferably have response curves that intersect at -3 dB. T...
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WO/2001/056150A1 |
The present invention relates to a filter (45) for filtering signals in a telecommunications system, a method of designing said filter, and a corresponding splitter filter. The inventive filter (45) is characterised in that it is passive...
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WO/2001/056156A1 |
An electrical signal is applied to a band pass filter (42), a first notch filter (43), and a second notch filter (44) in any order. The center frequencies of the notch filters straddle the pass band of the band pass filter. The notch fil...
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WO/2001/056153A1 |
In a circuit arrangement for band-pass filtering of a high frequency signal with a large bandwidth, several band-pass filters (1, 2) are arranged in parallel, with complementary throughput ranges. According to the invention, a circuit ar...
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WO/2001/056152A1 |
The invention discovered a digital technologic attenuate control circuit of current-model step by step. The circuit include a lot of stages of current attenuate circuit; in each of the current attenuate circuit stage, the digital control...
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WO/2001/052414A1 |
The separation of an adjacent band pass filters (11, 12, 13, 14, 15) is improved, without changing the filters, by inverting (21, 22) the output signals from alternate filters (12, 14) and not inverting the remaining output signals. All ...
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WO/2001/050599A2 |
The present invention provides an active low-pass filter system including a low-pass filter circuit (22, 24, 26, 28, 30) and at least one frequency-rejecting network (20) coupled to the low-pass filter circuit. The frequency-rejecting ne...
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WO/2001/048989A1 |
An equaliser circuit comprises at least one tuneable transconductance element (12, 14, 16, 18, 22) having its operating parameters determined by its supply voltage (Vdd). An automatic tuning means can be used to vary the supply voltage o...
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WO/2001/048918A2 |
A polyphase filter (20; 100) is described, having two filter channels (30¿I?, 30¿Q?; 101¿I?, 101¿Q?) for processing an I-input signal ($g(f)¿I?) and a Q-input signal ($g(f)¿Q?) which is shifted over 90° with respect to the I-input...
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