7results 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 present invention discloses an active phase shifter with temperature compensation, comprising an input transformer balun, a polyphase filter, a vector modulation module based on a Gilbert cell, an output transformer balun, and a positive temperature coefficient current source. The input transformer balun is used to convert a single-ended input signal into a differential signal; the polyphase filter is used to convert the differential signal into a quadrature signal; the vector modulation module based on the Gilbert cell is used to select polarity and perform vector synthesis on the quadrature signal; the output transformer balun is used to convert the differential signal at the output into a single-ended signal; and the positive temperature coefficient current source is used to control the gain of the Gilbert cell. By designing a temperature-dependent positive temperature coefficient current source, the present invention mitigates the temperature-dependent gain change of the vector modulation module, thereby improving the stability of the key performance of the active phase shifter within a temperature range of 55 to 85°C.

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 present invention discloses a charge pump and phase-locked loop with temperature compensation. The charge pump includes a constant current source, a temperature-controlled current source, a proportional module, and a control module. The proportional module is used to combine the constant current source and the temperature-controlled current source in a certain ratio and output the combined current to a control unit. When the charge pump injects current into the subsequent circuit in the forward direction, the control module injects a current obtained by combining the constant current source and the temperature-controlled current source in a certain ratio into the subsequent circuit. When the charge pump draws current from the subsequent circuit in the reverse direction, the control module draws a current obtained by combining the constant current source and the temperature-controlled current source in a certain ratio from the subsequent circuit. In this solution, compensation is achieved by combining the PTAT current and the constant current in a certain ratio to generate a KVCO power supply voltage, thereby achieving temperature compensation while avoiding overcompensation.

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.