Intel Corporation

Other

Mitel Semiconductor Limited

David Albert Sawyer

Nicholas Paul Cowley

Alistair Allen Miller

Martin G Baxter

Isaac Ali

Ali Isaac

Albert R Elphick

Richard J Goldman

Nader Rohani

Frederick C Copp

Nick Cowley

Barbara Roth

Brian H Hick

A self-configurable amplifier and method of amplification, including an RF signal level detector having an input connected to an RF signal, and an output configured to produce a control signal responsive to a power level of the RF signal. The control signal is supplied to a parametric adjustment circuit that includes an input connected to the control signal, and an output configured to provide a negative feedback responsive to the control signal. The negative feedback is supplied to an RF amplifier that includes an input forming an input of the self-configurable amplifier, an output forming an output of the self-configurable amplifier, and a control port connected to the output of the parametric adjustment circuit, such that one or more parameters of the RF amplifier is responsive to the negative feedback.

Dynamic signal contamination suppression

Techniques are described that can be used to reduce interference in a desired channel by one or more other channels. A radio includes a level detect logic that is responsive to both the frequency offset and amplitude of undesired signals and sets the gain applied to received signals based on the offset frequency and determined amplitude of undesired signals. For example, detection of a signal amplitude in an interfering signal in a channel adjacent to the desired channel may be made. Detection of a signal amplitude in an interfering signal in a channel other than the adjacent channel and desired channel may also be made. Based on detection of one or more interfering channel, a gain of an input signal may be adjusted. Interference arising from at least spectral re-growth of noise and clipping noise may be reduced.

Techniques to deterministically reduce signal interference

Embodiments of an active bandpass filter are described. Such a filter includes a transistor; a series-tuned inductive-capacitive (LC) network (STLCN) in a common source circuit associated with the transistor to produce a tuned degenerative filtering of at least one interfering signal; and a first, variable resistance associated with the STLCN to provide a first control of a resonance quality factor (Q) associated with the filter. Other embodiments may be described and claimed.

Tunable filter apparatus, systems, and methods

A radio frequency tuner comprises one or more tracking filters ahead of at least one frequency changer. A controller has a filter alignment mode and a reception mode. Each filter has one or more resonant networks comprising an inductance and a switched capacitor network which is digitally controlled for selecting the network resonant frequency. In the alignment mode, the controller determines the difference between the nominal and actual capacitances of the network for achieving a known resonant frequency in order to determine a correction factor for the capacitor network. The correction factor is then used during normal reception by the tuner.

Radio frequency tuner

A variable signal delaying circuit comprising an analog delay line having a control input for controlling the variable delay. A phase detector compares the input and output signals of the delaying circuit and supplies an output signal to a charge pump and integrator. A pulse stream generating arrangement produces pulse streams of different pulse widths and pulse control logic controls a selector for selecting any one of the pulse streams. In a first mode of operation, the control logic monitors the charge pump/filter output and selects the pulse stream which minimizes change in the output. The selection is fixed and the output of the charge pump/filter is then supplied as a correction signal to the control input of the analog delay line. Such an arrangement may be used to maintain minimum phase imbalance in I and Q signal paths of a quadrature frequency converter.

Variable signal delaying circuit, quadrature frequency converter and radio frequency tuner

A pulse generator is provided for generating pulses with a selectable variable width and/or delay. The pulse generator comprises an oscillator and a selecting arrangement for selecting how many of a first group of delay elements are connected in series for delaying the oscillator signal. Identical delay elements are connected in series to form a second group. A measuring circuit repeatedly measures the delay provided by the second group, for example providing output pulses whose width or duration is equal to the delay. A reference pulse generator generates a series of reference pulses, each of which is a predetermined fraction of the oscillator period. A control circuit compares the measurement and reference pulses to generate an error signal that is fed back to timing delay control inputs of all the delay elements such that the widths of the measurement and reference pulses are made substantially equal to each other.

Pulse generator, optical disk writer and tuner

In a multi-channel electrical communication system , a method of estimating the interference level in a test channel due to the intermodulation of two or more other channels, where each channel is centred upon a carrier frequency. The method comprises, for a given m-th order mode, an initial step of identifying the set(s) of carrier frequencies, the m-th order linear combination of which gives rise substantially to the carrier frequency of said test channel. This process is carried out by a computer . For the or each of the identified set of carrier frequencies, signal generators are tuned to respective ones of the carrier frequencies. The generated signals are applied to an input of the communication system , and the intermodulation interference at the carrier frequency of the test channel is measured at an output of the system

Cross-channel interference

3,5-Diamino-6-(2,3-dichlorophenyl)-1,2,4-triazine isethionate is provided. This salt has high water solubility and thus advantageously allows parenteral administration in the form of a sterile aqueous solution suitable for injection.

Triazine salt

The present invention provides compounds of the formula (III): ##STR1## or an acid addition salt thereof, wherein R.sup.6 is chlorine, bromine, iodine, C.sub.1-4 alkyl or trifluoromethyl, or R.sup.6 and R.sup.7 from a --CH.dbd.CH--CH.dbd.CH-- group optionally substituted by a halogen atom or a C.sub.1-4 alkyl or trifluoromethyl group, R.sup.8 is hydrogen, bromine, iodine, C.sub.1-4 alkyl or trifluoromethyl, R.sup.9 is hydrogen, halogen, C.sub.1-4 alkyl or trifluoromethyl, R.sup.10 is hydrogen, methyl or fluorine and R.sup.11 is amino, C.sub.1-10 acylamino or di-substituted aminomethyleneamino provided that, at most, only two of R.sup.7 -R.sup.10 are other than hydrogen and that R.sup.7 -R.sup.10 are not all hydrogen when R.sup.6 is chlorine. Also provided are pharmaceutical compositions containing compounds of the formula (III), the first medical use of compounds of the formula (III), a process for preparing such compounds and intermediates through which this process proceeds.

Substituted aromatic compounds

The present invention provides compounds of the formula (III): ##STR1## or an acid addition salt thereof, wherein R.sup.6, R.sup.7, R.sup.9 and R.sup.10 are each hydrogen, halogen, C.sub.1-4 alkyl or trifluoromethyl and R.sup.8 is chlorine or R.sup.7 and R.sup.8 are linked to form a --CH.dbd.CH--CH.dbd.CH-- group when one of R.sup.6 and R.sup.10 is other than hydrogen provided that when R.sup.8 is chlorine R.sup.6, R.sup.7, R.sup.9 and R.sup.10 are not all hydrogen atoms and that any one of R.sup.6, R.sup.7, R.sup.9 and R.sup.10 is not chlorine when the other three groups are hydrogen. Also provided are pharmaceutical compositions containing compounds of the formula (III), the first medical use of compounds of the formula (III), a process for preparing such compounds and intermediates through which this process proceeds.

The present invention provides compounds of the formula (III): ##STR1## or an acid addition salt thereof, wherein R.sup.6 is chlorine, bromine, iodine, C.sub.1-4 alkyl or trifluoromethyl, or R.sup.6 and R.sup.7 form a --CH.dbd.CH--CH.dbd.CH--group optionally substituted by a halogen atom or a C.sub.1-4 alkyl or trifluoromethyl group, R.sup.8 is hydrogen, bromine, iodine, C.sub.1-4 alkyl or trifluoromethyl, R.sup.9 is hydrogen, halogen, C.sub.1-4 alkyl or trifluoromethyl, R.sup.10 is hydrogen, methyl or fluorine and R.sup.11 is amino, C.sub.1-10 acylamino or di-substituted aminomethyleneamino provided that, at most, only two of R.sup.7 -R.sup.10 are other than hydrogen and that R.sup.7 -R.sup.10 are not all hydrogen when R.sup.6 is chlorine. Also provided are pharmaceutical compositions containing compounds of the formula (III), the first medical use of compounds of the formula (III), a process for preparing such compounds and intermediates through which this process proceeds.

The medical use of compounds of the formula (III): ##STR1## or pharmaceutically acceptable and addition salts thereof, wherein R.sup.6 is a hydrogen atom, R.sup.5 is a chlorine atom and R.sup.7 is a hydrogen or chlorine atom or R.sup.7 is a chlorine atom, R.sup.5 is a hydrogen atom and R.sup.6 is a chlorine atom, particularly for the treatment of CNS disorders, is disclosed. Solid pharmaceutical compositions are also described.

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Wiltshire, United Kingdom

David Albert Sawyer