摘要:
A variable-bias power amplifier is provided, comprising: a first variable voltage source generating first bias voltages based on bias control signals; a first amplifier circuit amplifying an output RF signal to generate a first amplified signal based on the first bias voltages; a second variable voltage source generating second bias voltages based on the bias control signals; a second amplifier circuit amplifying the output RF signal to generate a second amplified signal based on the second bias voltages; and a DC isolation circuit between the first amplifier circuit and the second amplifier circuit, electrically isolating DC currents at the first amplifier from DC currents at the second amplifier, wherein the first variable voltage source can be controlled independently from the second variable voltage source, and the first amplifier circuit, the second amplifier circuit, and the DC isolation circuit are all formed on a single die.
摘要:
According to one aspect of the present invention, an electronic assembly is provided. The electronic assembly comprises a substrate with a lead connected thereto and first and second microelectronic components on the substrate. The first microelectronic component has first and second portions. A plurality of conductors interconnects the first microelectronic component and a selected one of the lead and the second microelectronic component. A first of the conductors contacts the first portion of the first microelectronic component and has a first inductance, and a second of the conductors contacts the second portion of the microelectronic component and has a second inductance. The second inductance is greater than the first inductance.
摘要:
A device includes a power splitter configured to couple to an amplifier having a first path and a second path. The device includes a controller coupled to first and second variable attenuators and first and second adjustable phase shifters. The controller is configured to monitor a phase shift and an output power of each of the first path and second path of the amplifier, and adjust at least one of the first and second variable attenuators and the first and second adjustable phase shifters based upon the phase shift and the output power of each of the first path and second path of the amplifier to modify an input signal to the first path or the second path of the amplifier.
摘要:
A system and method of calibrating an amplifier are presented. The amplifier has a first amplification path and a second amplification path. A first state of the amplifier is identified defining a first phase shift of the first path and a second phase shift of the second path resulting in a maximum efficiency of the amplifier when an attenuation of the first path and an attenuation of the second path are set to first attenuation values. The attenuation of the first path and the attenuation of the second path is set to achieve a maximum efficiency of the amplifier when the phase shift of the first path and the phase shift of the second path are set according to the first state.
摘要:
A thermal phase separation simulator and method for testing chemicals is disclosed. The simulator comprises a circular block heater carousel mounted for rotation on a stage. The carousel includes a circular array of test wells for receiving a plurality of test bottles, a plurality of heating elements and thermocouples disposed between the wells. Each well has an illumination port and a vertical slit to the outside to allow visual observation or imaging of a vertical swatch of the bottle. An illumination source aligns with the illumination port of each well in response to rotation of the carousel. The method includes adding a mixed phase fluid to a plurality of bottles, adding a chemical agent to each bottle, and simulating a thermal phase separation. Images of the fluid in each bottle are captured and analyzed to determine the performance of the one or more chemical agents.
摘要:
Disclosed are methods for accelerating the settling of finely divided, oil-and-water-insoluble solids in hydrocarbon fluids using an effective amount of an alkylphenol-formaldehyde resin alkoxylate having a molecular weight of about 500 to about 5,000. Preferably, the hydrocarbon is a fluid catalytic cracker slurry containing spent catalyst fines.
摘要:
A combination of aluminum chlorohydrate and a polyamine, such as polydiallyldimethyl ammonium chloride in an aqueous solution is described which is an effective emulsion breaker for reverse (oil-in-water) emulsions. The combination is effective at elevated temperatures and in a matrix comprising mostly oil as encountered in a crude oil desalter unit.
摘要:
A method for accelerating the settling of finely divided solids in hydrocarbon fluids comprising adding to the hydrocarbon a sufficient settling amount of a hetero-atom punctuated fatty polymer. Preferably, the hydrocarbon is a fluid catalytic cracker slurry containing spent catalyst fines.
摘要:
Methods for removing paraffin wax deposits from the surfaces of oilfield production equipment during oil production by melting and subsequently dispersing the deposits. These methods utilize an acid compound and a neutralizer compound which react exothermally to melt the deposit and form a dispersant to remove the melted fragments of the deposit.
摘要:
Methods of diminishing the benzene content of the effluent wash water in a two stage crude oil desalting system are disclosed. The first stage desalter is operated at "low", near ambient temperatures with decreased mixing of crude oil and wash water and increased addition of demulsifier. The second stage is operated at "hot" temperatures of prior processes with increased mixing of the crude oil and wash water. The effluent wash water has a substantially diminished benzene content compared to prior two-stage desalting systems.