摘要:
Embodiments of the present invention provide a pipeline ADC front-end sampling structure that provides a continuous time input signal to a flash comparator for sampling. By providing a continuous time input signal to the flash comparator, no delay is introduced from the need to transfer a DC charge representing the sampled input to the flash comparator. Matching sampling networks in the residual generator and the flash comparator are avoided due to the high bandwidth response requirements of the residual generator and the flash comparator when operating on high frequency input signals.
摘要:
Digitally-controlled, variable-gain mixers and amplifiers are provided which couple transconductance cells to receive respective tap signals from a fixed attenuator that receives a first input signal. A gain interpolator provides first and second control currents with amplitudes that correspond to a segment of a control word and a multiplexer responds to another control-word segment by routing the control currents to a selected pair of adjacent transconductance cells. In response, the transconductance cells provide amplifier current signals which can also be routed to a transistor switch that mixes them with a second input signal to generate a mixer output signal whose amplitude corresponds to the control word.
摘要:
Methods and apparatus are described by which media assets may be prioritized and published in accordance with current topics of interest derived from a dynamic data set representing the online activity of a relevant population of users.
摘要:
A method of quality control to diagnose the cause of a malfunction of an instrument. The method uses measurements of the physical property of a sample to diagnose the cause of a malfunction of an instrument. The spatial position of a control product sample is analyzed. Alternatively, the spatial position of a statistically significant number of patient blood samples can be used. The method enables the monitoring of an instrument for problems associated with debris and noise caused by red cell lysis inefficiency; instrument reagents pump volume settings; instrument laser alignments; instrument gain settings; and flow noise caused by partial plugs, residual plugs or other flow problems. The method provides a more specific indication of the type and cause of an instrument malfunctioning than non specific flagging provided by prior art methods.
摘要:
A method for producing an antenna, by introducing a moldable material into a mold and molding the material in the mold into an antenna having a desired shape, preferably a helical shape. The method is used to produce an antenna including a generally rigid, conductive coil, which is mechanically self-supporting.
摘要:
A retractable antenna module including a first, generally stationary plate and a second plate, movable relative to the first plate. The second plate moves between a retracted configuration of the module, in which the plates together function substantially as a feedthrough-fed antenna, and an extended configuration of the module, in which the second plate functions substantially as a monopole antenna.
摘要:
A process for the production of a boronic acid of formula III, ##STR1## in which an organometallic of formula IV, ##STR2## in which formula IV, M represents a metallic moiety such as --MgX, X being a halogen or an alkali metal is treated with a trialkoxy borane of formula B(OR).sub.3, R representing an alkyl group and the product is hydrolysed.
摘要:
A process for the production of a boronic acid of formula III, ##STR1## in which an organometallic of formula IV, ##STR2## in which formula IV, M represents a metallic moiety such as --MgX, X being a halogen or an alkali metal is treated with a trialkoxy borane of formula B(OR).sub.3, R representing an alkyl group and the product is hydrolyzed.
摘要:
A compound of the formula: ##STR1## wherein Y represents OH or a halogeno group;D represents hydrogen or a cyano group;B represents hydrogen or a methyl, ethyl or vinyl group;A represents methyl;n is 0, 1 or 2;with the proviso that(1) when the CH.sub.2 CH.dbd.CHB group is in the 4-position with respect to the CHDY group, then D must be hydrogen and B must be methyl, ethyl or vinyl and the configuration about the double bond in the CH.dbd.CHB group must be Z and(2) when the group CH.dbd.CHB is in the 3-position with respect to the CHDY group and D is CN then n must be 0 and(3) when the group CH.sub.2 CH.dbd.CHB is in the 2 or 3-position with respect to the CHDY group, then D is CN, are useful in the production of pesticidal esters of chrysanthemic and related acids.
摘要:
New insecticides are of formula: ##STR1## wherein R.sup.1 represents hydrogen or a methyl group; R.sup.2 represents hydrogen or a halogeno or lower alkyl group; R.sup.3 represents hydrogen or a halogeno or carbo(lower alkoxy) group which contains at least 2 carbon atoms in the lower alkoxy residue when R.sup.2 represents methyl; with the proviso that (a) R.sup.2 and R.sup.3 each represent hydrogen only when R.sup.1 represents methyl, (b) when R.sup.1 and R.sup.3 each represent hydrogen and R.sup.2 represents alkyl, that alkyl group contains at least 2 carbon atoms and (c) when R.sup.3 represents halogeno, R.sup.2 represents hydrogen or halogeno; and R represents a group which forms insecticidal esters with chrysanthemic acid e.g. 5-benzyl-3-furylmethyl, 3-phenoxybenzyl, .alpha.-cyano-3-phenoxybenzyl. The esters are prepared by forming the ester linkage conventionally or by a Wittig reaction using a 3-formyl- or 3-acetyl-2,2-dimethyl cyclopropane carboxylic acid esterified with the desired residue or by an alkyl group which is subsequently converted to the desired residue.