5results about "Network modifications to reduce temperature" patented technology

Apparatuses and methods for calibrating adjustable impedances of a semiconductor device are disclosed in the present application. An example apparatus includes a register configured to store impedance calibration information and further includes programmable termination resistances having a programmable impedance. The example apparatus further includes an impedance calibration circuit configured to perform a calibration operation to determine calibration parameters for setting the programmable impedance of the programmable termination resistances. The impedance calibration circuit is further configured to program the impedance calibration information in the register related to the calibration operation.

The application discloses a temperature compensation attenuator and a design method thereof, relates to an attenuator device, and belongs to the field of radio frequency and microwave, wherein the temperature compensation attenuator comprises a temperature compensation driving module and an attenuation structure. The temperature compensation driving module adjusts the attenuation of the attenuation structure circuit according to a temperature compensation circuit and a differential network control voltage. The attenuation structure circuit is connected between an input port and an output port, and realizes the circuit attenuation compensation function. The temperature compensation attenuator can compensate the gain variation of active devices caused by temperature change in the microwave / radio frequency channel, has a wide working frequency range, and is suitable for a large attenuation compensation range.

The utility model discloses a low-temperature filtering module and a quantum computer using the same. The low-temperature filtering module comprises a grounded shell, the filter main body is integrated in the shell, and the filter main body comprises a plurality of coaxially arranged metal cylinders to form an impedance conversion structure; the infrared wave-absorbing structure is integrated in the housing, and the infrared wave-absorbing structure wraps the filter main body. According to the utility model, the low-pass filter and the infrared wave-absorbing structure are integrally designed through a coaxial discontinuous metal cylinder structure, and impedance conversion filtering and infrared quasi-particle absorption functions are realized in parallel in an integrated module, so that the high-frequency filtering performance of an original separation device is maintained, the number of devices is reduced through function integration, and the cost is reduced. The material cost and the occupied space of the mK temperature zone are remarkably reduced, the cooling capacity pressure of a refrigerator is relieved, meanwhile, the loss of a cascade connector is eliminated, the consistency of devices is improved, and a key solution is provided for space expansion and reliability optimization of a high-density superconducting bit system.

The invention discloses a controllable resistor module linearly changing along with current and application of the controllable resistor module. A controllable resistor comprises an operational transconductance amplifier, a PMOS (P-channel Metal Oxide Semiconductor) tube PM1 and a PMOS tube PM2, the controllable resistor module can generate an equivalent resistor in direct proportion to a sampling current, so that the equivalent controllable resistor Rds and the Isense can be linearly correlated, the influence of process errors and temperature is small, the generated error is small, and the controllable resistor module can be applied to current-controlled oscillators, automatic gain control and other scenes needing controllable resistors.

The invention discloses a self-calibration low-frequency compensation circuit system for a resistance-capacitance attenuator and a dynamic calibration method. In order to solve the problem of frequency response distortion caused by parasitic parameters and component tolerance, through cooperative work of the stepping digital potentiometer and the resistance-capacitance attenuator, gain deviation of a transition section from low frequency to high frequency is accurately compensated, and gain fluctuation and waveform distortion are effectively inhibited. According to the invention, the amplitude-frequency flatness and phase consistency in the frequency band from DC to 1MHz are obviously improved, the environment adaptability to temperature, load and parasitic parameter drift is enhanced, and the method is suitable for a high-precision AC voltage and power measurement front end. In order to solve the problem that a traditional fixed compensation element is easily influenced by environment temperature drift and long-term operation aging and the like, the adjustability of the digital potentiometer is utilized, attenuation proportion drift generated by leakage current or environment change can be corrected in real time, and it is ensured that a circuit system can maintain extremely high measurement accuracy under different working conditions.