34results about "Network modifications to reduce temperature" patented technology

Apparatus and methods for regulating gate delays of synchronous and asynchronous digital circuits. Thermally-sensitive circuits include, generally, temperature sensitive voltage sources outputting a voltage signal indicative of the temperature of the digital circuit, where the voltage signal reflects non-linear temperature sensitivity above a predetermined threshold temperature, and delay mechanisms receiving said temperature sensitive voltage signal(s) as input and being configured to automatically continuously modulate the speed of signal propagation through the circuit in response to said voltage signal, thereby causing circuit elements within the circuits to switch less frequently and consequently causing the circuit elements to generate less heat with increasing circuit temperature.

An integrated receiver with channel selection and image rejection substantially implemented on a single CMOS integrated circuit is described. A receiver front end provides programable attenuation and a programable gain low noise amplifier. Frequency conversion circuitry advantageously uses LC filters integrated onto the substrate in conjunction with image reject mixers to provide sufficient image frequency rejection. Filter tuning and inductor Q compensation over temperature are performed on chip. The filters utilize multi track spiral inductors. The filters are tuned using local oscillators to tune a substitute filter, and frequency scaling during filter component values to those of the filter being tuned. In conjunction with filtering, frequency planning provides additional image rejection. The advantageous choice of local oscillator signal generation methods on chip is by PLL out of band local oscillation and by direct synthesis for in band local oscillator. The VCOs in the PLLs are centered using a control circuit to center the tuning capacitance range. A differential crystal oscillator is advantageously used as a frequency reference. Differential signal transmission is advantageously used throughout the receiver.

A timer circuit is disclosed. The timer, having a delay configured to track inversely with temperature of the memory device, includes a reference signal configured to increase in voltage, as the temperature of the memory device increases. The reference signal may be generated from a current that is derived from a bandgap reference circuit. The timer circuit includes a pull-down path made up of a plurality of selectable pull down transistors which are coupled to the reference signal at the gate. Resistance of the pull-down path is reduced as the reference signal is increased and the reduced resistance of the pull-down path decreases the delay of timer. A plurality of selectable delay elements may be preconfigured to adjust the delay and are coupled to the output path of the current starved inverter.

This invention discloses an active load generation circuit and a filter. The active load generation circuit includes a transistor, a voltage control circuit, a voltage offset and tracking circuit, and a temperature sensing circuit. The transistor provides an impedance and includes a control terminal and an input terminal. The control terminal receives a control voltage, the input terminal receives an input signal, and the impedance is associated with the control voltage. The voltage control circuit generates an intermediate voltage according to a power supply voltage and a first reference voltage. The voltage offset and tracking circuit generates the control voltage according to the input signal and the intermediate voltage such that the control voltage varies with the input signal. The temperature sensing circuit senses an ambient temperature of the active load generation circuit and adjusts the first reference voltage according to the ambient temperature.

The invention provides an active filter RC time constant calibration circuit and method. The method is characterized by charging a calibration capacitor array CBANK with a constant current, charging time being T; and measuring an actual capacitance value through the voltage VO of the calibration capacitor array CBANK, and correcting the capacitance value of a capacitor array C in an active filter,wherein the calibration capacitor array CBANK and the capacitor array C form a proportional relation, and the charging time T is related to the expected RC time constant of the active filter.

The invention relates to a defrosting apparatus and methods for operation thereof. The system includes an RF source, two electrodes proximate to a cavity within which a load to be defrosted is positioned, a transmission path between the RF signal source and the electrodes, and an impedance matching network electrically coupled along the transmission path between the output of the RF signal sourceand the electrodes. The system also includes power detection circuitry coupled to the transmission path and configured to detect reflected signal power along the transmission path. A system controlleris configured to modify, based on the reflected signal power, values of variable capacitors of the impedance matching network to reduce the reflected signal power. The impedance matching network maybe a single-ended network or a double-ended network.

The invention discloses a novel double-port input control circuit with a temperature drift suppressing property and a Schmidt property. The circuit consists of a temperature drift suppressing circuit and a window circuit and can be used in the internal or external part of a transformer isolated or photo-isolated solid relay as a control drive of the preceding stage. With the mutual suppression of a triode, the control circuit realizes the temperature drift resisting function through utilizing a current feedback function and ensures connection of the solid relay and relative stable of the closed threshold voltage; meanwhile, the control circuit realizes overturning of the output voltage through utilizing the reversal function of the triode; and the control circuit realizes the window property, namely the Schmidt property of the connected voltage and turnoff voltage of the solid relay through the negative feedback formed by a resistor. Compared with the traditional temperature suppression circuit, the input function of the Schmidt property is increased, so that the problem that the PN junction voltage input in a control apparatus is changed with the change of the environment temperature is solved, and stable input and reliable application of the solid relay in the total temperature operating scope are ensured.

The invention discloses a temperature compensation attenuator, which is applied to a radio frequency system along with temperature rise and attenuation drop under the condition of keeping matching, and can realize the effect of compensating high and low temperature gain changes of other radio frequency modules, so that the high and low temperature gain of a transceiving link is flat, and the design difficulty of high and low temperature application of the radio frequency system is reduced.

The invention relates to a transduction type active low-pass filter. The filter comprises a case, a heat absorbing layer, a filtering main body and four pins. The heat absorbing layer is arranged at the inner side of the case; the filtering main body is arranged at the central position in the case; the four pins are arranged around the filtering main body, and the filtering main body is electrically connected with the four pins via leads. Heat-dissipating graphite flakes fill the gap in the case; the two ends of the case are connected with a thermal energy conversion storage; one end of the thermal energy conversion storage is fixedly connected with an output port. The transduction type active low-pass filter is simple in structure. The heat-dissipating graphite flakes are three-dimensional in structure and not only has excellent heat conductivity in the vertical direction, but also could conduct heat in the longitudinal direction, so that the heat could be fast conducted to the heat absorbing layer via the characteristic of the longitudinal heat conduction when local thermal energy is too high. The thermal energy conversion storage could be used for converting the thermal energy into electric energy, and storing the electric energy to be used as power for the filter. The transduction type active low-pass filter is economical and environmental-friendly, and prolongs the service life of equipment, reduces the production cost, and is easy for popularization.

The invention relates to the technical field of attenuators, in particular to a novel high-linearity temperature compensation attenuator. The attenuator comprises a voltage division circuit part and an attenuation circuit part, the voltage division circuit part comprises a group of diodes D0 with temperature characteristics and a group of resistors RO, R0 and DO which are connected in series to obtain voltage capable of changing along with temperature, and the voltage is connected to the grid end of a transistor in the attenuation circuit part through a connecting microstrip line; according tothe attenuation circuit part, resistors R1, R2, R3 and R4 and two sets of transistors K1 and K2 form an attenuation circuit of a pi-like structure, one end of the transistor set is connected with theresistor, the other end of the transistor set is grounded, and the grid end of the transistor set is connected with voltage led out by the voltage division circuit part. The attenuator is suitable for the design of various different technologies, the design of the whole circuit can be correspondingly completed for various types of transistors, and the same design index is finally achieved.

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 impedancecalibration 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 invention relates to ZQ calibration using a current source. A memory device includes a terminal calibration circuit having at least one of a pull-down circuit or a pull-up circuit used in calibrating an impedance of a data bus termination. The memory device also includes a reference calibration circuit configured to generate a calibration current. The terminal calibration circuit can be configured to program an impedance of the least one of a pull-down circuit or a pull-up circuit based on the calibration current.

A filter and an operating method thereof are provided. The filter includes a logic circuit, a power circuit and a filter circuit. The logic circuit provides a switching control signal. The power circuit is coupled to the logic circuit. The filter circuit is coupled to the power circuit and the logic circuit. The filter circuit includes an amplifier, a first capacitor and a first transistor. An output end of the amplifier is coupled to the logic circuit, and provides an output signal. The first capacitor is coupled between an input end and output end of the amplifier. The first transistor is connected in parallel with the first capacitor. A control end of the first transistor is coupled to the power circuit. The logic circuit provides a switching control signal to the power circuit according to the output signal. The power circuit supplies a control voltage to the first transistor according to the switching control signal. Therefore, the filter of the present invention and its method of operation can provide an accurate filtered signal output function.

The invention concerns an antenna system of a radio microphone, containing an antenna path starting at an In port (2), and ending at an Out port (6), with an amplifier (3) and a RF cable (5). In order to compensate for various cable attenuations, an attenuator (4) is provided in series with a variable slope compensator (7) between the amplifier (3) and the RF cable (5). In order to avoid the negative effect on large signal behavior of variable slope compensators according to the prior art, FETs or pin diodes or similar "micro-switches" are used for switching of the resistances, but only as pure switches without an effect on the signal, so that an excellent large signal behavior is achieved.

The invention relates to the technical field of filters, in particular to a signal fuzzy control filter for a wafer detection device. The signal fuzzy control filter comprises a wafer machine table, a detection module, a filter terminal and a controller. Due to the conditions of fragments and the like of the wafer in the circulation process, the operation of a machine table needs to be suspended for cleaning, and the application effect of the wafer detection device in production is influenced, so phase angle analysis is carried out on electric signal waveforms of wafer position information of the wafer detection device in different stations of a wafer machine table through the arranged phase circuit and clock circuit, and the position error of each wafer in the wafer machine table is converted into the relative position difference between the circulating wafers in each station; the signal fuzzy control filter for the wafer detection device has a fuzzy screening effect on the electric signal data transmitted by the wafer detection device, and reduces the processing capacity of a controller after the filter terminal processes the peak-valley value of the electric signal waveform through the analysis of the waveform phase angle, thereby improving the application effect of the signal fuzzy control filter for the wafer detection device.