摘要:
This application relates to a circuit for determining whether a first transistor device is in a predetermined operation mode. The circuit comprises comprising: a second transistor device, wherein control terminals of the first and second transistor devices are connected, and one of input and output terminals of the first transistor device is connected to the other one of input and output terminals of the second transistor device, a buffer amplifier connected between the one of input and output terminals of the first transistor device and the other one of input and output terminals of the second transistor device, and circuitry for determining whether the first transistor device is in the predetermined operation mode based on an indication of a current flowing through the second transistor device. The application further relates to a method of determining whether a first transistor device is in a predetermined operation mode.
摘要:
A transistor arrangement is disclosed. The transistor arrangement includes at least first and second sets of sense cells and at least one set of main cells. Each set of sense cells shares drain and gate connections with an associated set of main cells, with a different ratio of number of sense cells to associated main cells for the first set as for the second set.
摘要:
A common mode noise sensor with a single amplification path is disclosed. The common mode noise sensor includes first and second terminals for receiving respective first and second signals from a power supply, an amplifier stage connected to the first and second terminals and having an output and a resistor network connected to the amplifier stage. The resistor network is arranged such that the output of the amplifier stage is configured to provide an output signal in which a differential mode noise in the first and second signals is suppressed in preference to a common mode noise in the first and second signals.
摘要:
A safe powerline communications instrumentation front end device including a voltage input for receiving a line voltage from a powerline, a voltage reducer for reducing the voltage of the line voltage, a filtering system for extracting a Power Line Communications (PLC) signal from the line voltage, and an analog output for outputting the PLC signal as an analog signal for communications test equipment.
摘要:
An output stage module for a power amplifier device (e.g., for a power amplifier device of a transmit unit of a magnetic resonance device) includes a housing and a carrier that is arranged within the housing. The carrier is made of a non-electrically-conducting, thermally-conducting material with low electrical losses (e.g., a ceramic carrier). At least two transistor dies are arranged on the carrier. At least one transistor, in each case, is assigned to a phase of a symmetrical input signal. In and/or on the carrier, a first conductor structure connecting (e.g., inductively) a drain output of the at least two transistor dies to an output signal and to second conductor structures each conducting an input signal to at least one gate input of the at least two transistor dies are provided. At least one cooling channel routed adjacent to at least one transistor die of the at least two transistor dies is provided.
摘要:
In one possible implementation, a method is provided for determining contactor health including measuring a differential voltage between a first utility line voltage and a second utility line voltage on a primary side of a contactor and on a secondary side of the contactor. The measuring is performed with both an unloaded current and with a load current. The unloaded and loaded measurements are performed at the primary side and the secondary side, and are made with the contactor closed. It includes determining a difference between a secondary unloaded voltage and a secondary loaded voltage and subtracting a difference between a primary unloaded voltage and a primary loaded voltage to provide a contactor voltage drop. The contactor resistance is determined by dividing the contactor voltage drop by the loaded current.
摘要:
A continuously manually or remotely adjustable microwave attenuator and linear phase shifter is made using a two section slabline structure in which a “U” formed center conductor forms a line-stretcher to adjust the transmission phase and slivers of ferromagnetic material are inserted into the magnetic field of the slabline, or thin layers of dielectric material are inserted into the electric field serving either way to reducing the amplitude of the transmission factor, or increase the attenuation. The unit is manually or remotely controlled, in which case its transmission behavior can be calibrated on a VNA and used in test software for automated differential load pull operations.
摘要:
A circuit for sensing current in a capacitive network. A first capacitor carries a first current. A second capacitor is connected to the first capacitor thereby forming a current divider. The second capacitor carries a second current which is proportional to the first current. A transimpedance amplifier is connected to the second capacitor and has a voltage output that is proportional to the second current. Using a current feedback amplifier as the transimpedance amplifier significantly improves bandwidth and stability.
摘要:
A current sensing system constituted of: an impedance element; a switching network arranged to alternately couple a first end of the impedance element between a supply voltage and return, the impedance element arranged to develop a voltage there across reflecting a current flow to a load coupled to the second end of the impedance element; a first stage amplifier, a first and second input thereof respectively coupled to the first and second end of the impedance element, a power supply input thereof coupled to a voltage greater than the supply voltage and a return thereof coupled to the first end of the impedance element, the amplifier having a first and second output, the potential difference reflecting the impedance element voltage times a first stage gain; and a second stage amplifier, a first and second input thereof respectively coupled to a first and second output of the first stage amplifier.
摘要:
A continuously manually or remotely adjustable microwave attenuator and linear phase shifter is made using a two section slabline structure in which a “U” formed center conductor forms a line—stretcher to adjust the transmission phase and slivers of ferromagnetic material are inserted into the magnetic field of the slabline, or thin layers of dielectric material are inserted into the electric field serving either way to reducing the amplitude of the transmission factor, or increase the attenuation. The unit is manually or remotely controlled, in which case its transmission behavior can be calibrated on a VNA and used in test software for automated differential load pull operations.