313 results about "Switched capacitance" patented technology

A system and method are used to maintain a variance in feedback factors of an amplifier between the first and second phases either below a threshold value or within a specified range. The system includes the amplifier and first through third capacitances. The amplifier is coupled between an input node and an output node that operates during first and second phases of operation. The first capacitance is coupled across the amplifier and between the input node and the output node during the first and second phases of operation. The second capacitance is coupled to the input node during the first phase of operation. The third capacitance is coupled to one of the input and output nodes during one or both of the first and second phases of operation.

The invention discloses an ultra-wideband circulator based on a periodic modulation topology circuit, and belongs to the technical field of microwave and radio frequency nonreciprocal circuits. The working bandwidth range of the circulator is widened, and non-reciprocal transmission is achieved through non-magnetic materials. A time sequence control unit is respectively connected with a Floquet topology circuit layer, a clock signal driving module, a reset signal driving module and a start signal driving module; the Floquet topology circuit layer is respectively connected with a first coupling port, a second coupling port and a third coupling port; the other ends of the first coupling port, the second coupling port, the third coupling port, the clock signal driving module, the reset signal driving module and the starting signal driving module are respectively grounded; the Floquet topology circuit layer adopts a six-layer parallel network structure, and each layer of network structure comprises a coupling capacitor and three N-type MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) switches. The advantages of the switched capacitor structure are utilized, and the signal processing capacity which is high in integration level, small in size and capable of breaking through delay-bandwidth limitation is achieved.

Switched capacitor power converter circuitry configured to receive an input voltage and to output an output voltage, the switched capacitor power converter circuitry comprising: a switch network; a flying capacitor coupled to the switch network; and an output capacitor coupled to an output node of the switch network, wherein the switched capacitor power converter circuitry is operable in: a first mode in which the switch network operates at a fixed duty cycle; and a second mode in which the switch network operates at a variable duty cycle based on a predetermined flying capacitor charging threshold and a predetermined flying capacitor discharging threshold.

The invention relates to the technical field of radio frequency integrated circuits, and discloses a low-noise voltage-controlled oscillator circuit which comprises a source electrode following low-noise bias circuit with digital calibration, a source electrode following low-noise bias circuit with digital calibration, a source electrode following low-noise bias circuit with digital calibration and a source electrode following low-noise bias circuit with digital calibration, the cross-coupled amplifier array is composed of a plurality of units, and the source electrode of the cross-coupled amplifier array suppresses low-frequency noise through a resistance-capacitance feedback network and receives a digital amplitude calibration signal so as to dynamically adjust the number of working units and stabilize the output amplitude; the amplitude self-calibration loop consists of digital logic and a peak detector; the switched capacitor unit array is provided with stable direct-current bias; and a wide linear variable capacitor array driven by the stepped bias voltage. Through deep fusion of digital and analog technologies, the phase noise is remarkably reduced, the linear tuning range is widened, the amplitude stability is ensured, the power consumption is reduced, and the method is particularly suitable for a high-performance radio frequency communication chip of the Internet of Things.

The invention discloses a load transient detection circuit of a COT Buck, a corresponding COT Buck and a switching power supply. The load transient detection circuit comprises an input end, three resistors connected in series, two comparators and a switched capacitor sampling hold circuit, wherein the input end is grounded after passing through the three resistors in sequence. A node between the input end and the first resistor and a node between the second resistor and the third resistor are connected to the input ends of the first comparator and the second comparator through a switched capacitor sampling hold circuit structure. Valley voltage information and peak voltage information of inductive current are obtained through the switched capacitor sampling hold circuit, whether a load is transiently changed or not is judged by comparing inductive current ripples with a valley value and a peak value, and it is guaranteed that the switching power supply has appropriate transient detection trigger threshold voltage under any load. According to an output signal of the load transient detection circuit, the COT Buck can increase the turn-on or turn-off time so as to enhance the transient response speed.

A three-phase wireless electric energy transmission device disclosed by the present invention comprises a three-phase inverter, a three-phase switch capacitor, a coil magnetic field coupling structure and a rectifier, the coil magnetic field coupling structure comprises a primary coil and a secondary coil which are arranged in mirror symmetry, the primary coil is provided with two layers, each layer comprises a three-phase coil, each phase coil occupies a 120-degree angle range of the circumference, and the rectifier is connected with the primary coil and the secondary coil. The two layers of coils form a staggered angle, each phase of switched capacitor of the three-phase switched capacitor comprises a first capacitor branch and a second capacitor branch which are arranged in parallel, the first capacitor branch is provided with a first capacitor, and the second capacitor branch comprises a second capacitor and a switch module which are arranged in series; the switch module adjusts the equivalent capacitance value of the second capacitor branch through the duty ratio and adjusts the transmission power of the three-phase wireless power transmission device. The invention further discloses a load power adjusting method of the three-phase wireless power transmission device, the transmission efficiency can be kept unchanged within the adjusting range, and soft switching can be achieved within the adjusting range.

The invention provides a spark discharge device and a spark discharge accurate control method, and relates to the technical field of spark discharge. The device comprises a pair of spark electrodes, a rotary switch, a capacitor and a power supply, wherein a gap exists between working ends of the spark electrodes; the spark electrode, the rotary switch and the capacitor are connected in series to form a discharging loop, and the capacitor and the power supply are connected in series to form a charging loop; the rotary switch comprises a rotatable rotor and a toothed bar connected with the rotor; a contact is arranged in the discharge loop, and when the contact is in contact with the toothed bar, the discharge loop is conducted. According to the invention, the discharge loop is rapidly switched on and switched off through the rotary switch, various parameters of spark discharge can be accurately and stably controlled, so that the spark discharge is not influenced by the environment, such as spark breakdown voltage, discharge frequency and the like, and the spark discharge can be prevented from being converted into corona, glow or arc discharge, for example, the spark discharge can be normally generated under low air pressure.

The present invention discloses a hybrid switching converter with a single inductor and multiple outputs and a control method thereof, configured to convert an input voltage to a first and a second output voltages. The hybrid switching converter includes: a sub-switching converter, which converts the input voltage to an intermediate voltage; a first and a second output switches, which conduct the intermediate voltage during a first and a second inductance periods, respectively, to generate the first and second output voltages. The sub-switching converter comprises: a switched capacitor voltage divider circuit, which controls multiple switches through pulse-width modulation (PWM) signals to generate two divided voltage levels in each inductance cycle for supplying an inductor therein; and a control circuit, which generates PWM signals to control the multiple switches and the output switches in a time-division manner, and regulates the output voltages to target values according to output voltage feedback signals.

The invention discloses a pixel unit circuit for a dynamic vision sensor. The pixel unit circuit comprises a photodiode, an IV conversion circuit, a switched capacitor amplifier, a comparison circuit and a pixel readout logic circuit, the switched capacitor amplifier comprises a first capacitor, a second capacitor, an operational amplifier and a reset switch tube, the first capacitor is connected between the output end of the IV conversion circuit and the inverted input end of the operational amplifier, the in-phase input end of the operational amplifier is connected with a reference power supply, and the output end of the operational amplifier serves as the output end of the switched capacitor amplifier; the operational amplifier is connected with the comparison circuit, the second capacitor is connected between the inverted input end and the output end of the operational amplifier, the drain electrode and the source electrode of the reset switch tube are connected with the inverted input end and the output end of the operational amplifier respectively, and the substrate of the reset switch tube is connected with the output end of the switched capacitor amplifier; the comparison circuit is used for outputting event signals; and the pixel read-out logic circuit is used for reading out the event signal and is connected with the grid electrode of the reset switch tube.

A hybrid switching converter with a single inductor and multiple outputs is disclosed for converting an input voltage to a first output voltage and a second output voltage. The hybrid switching converter includes a sub-switching converter configured to convert the input voltage to an intermediate voltage, and first and second output switches configured to respectively convert the intermediate voltage to the first and second output voltages. An inductor has one terminal coupled to a switched-capacitor voltage dividing circuit and another terminal coupled to a second voltage. Under different configurations, the inductor is coupled to either a negative terminal or a positive terminal of a first capacitor, thereby converting the first voltage to either half the first voltage and a reference potential, or the first voltage and half the first voltage. The first voltage and the second voltage respectively correspond to one of the input voltage and the intermediate voltage.

The invention provides a multi-resonant switched capacitor efficient cooperative operation method suitable for battery active equalization, and the method comprises the steps: building a zero-voltage soft switching realization condition model of a single-module resonant unit, and determining the amplitude constraint and direction constraint of a soft switching current needed by a switching tube for realizing zero-voltage switching; based on topology, identifying current paths of the half bridges located at the top layer, the middle layer and the bottom layer in the soft switching transient process, and determining a mathematical relationship between the soft switching current of each layer of half bridge and the current of each resonant cavity; respectively establishing equivalent circuit models at switching moments for the top-layer half-bridge, the middle-layer half-bridge and the bottom-layer half-bridge, and solving to obtain each initial current value of the corresponding junction capacitor voltage at the switching moments; and substituting each initial current value obtained by solving into the established constraint condition, and drawing an operation parameter boundary of the topology capable of realizing soft switching in all working modes. According to the invention, by determining the operation boundaries of all half-bridge soft switches of the multi-resonant switched capacitor structure, the switching loss is reduced, and the operation efficiency is improved.

The invention relates to a W-band low-noise voltage-controlled oscillator based on a transformer resonant cavity and harmonic extraction. The W-band low-noise voltage-controlled oscillator comprises a dual-core in-phase coupled oscillator core, a two-bit switched capacitor bank, a linear variable capacitor bank and an output buffer, the dual-core in-phase coupled oscillator core comprises a transformer resonant cavity and a harmonic extraction network, a fundamental wave oscillation signal is generated in the transformer resonant cavity and is coupled and output to the output buffer, and a high-power second harmonic oscillation signal is generated in the harmonic extraction network and is output as a target oscillation signal; the two-bit switched capacitor bank adopts an HBT switch with excellent high-frequency performance, the tuning range of the oscillator is divided into four sub-bands, and the tuning gain is reduced; the capacitance value of the linearized variable capacitor bank is linearly changed along with the tuning voltage height, and a conversion mechanism of flicker noise is inhibited; and the output buffer realizes load isolation and buffering of the fundamental wave oscillation signal. The voltage-controlled oscillator has low tuning gain and high output power in the W wave band, and excellent phase noise is achieved.

A tail regulated switched capacitor converter can include a plurality of switched capacitor stages each having a flying capacitor and a plurality of switching devices. The plurality of switching devices can include a first group of one or more switches that selectively couple the flying capacitor to one of an input or output voltage rail via a first current path and a second group of one or more switches that selectively couple the flying capacitor to a tail voltage rail via a second current path. The first and second groups of one or more switches can be switched complementarily to one another with a 50% duty cycle. The tail regulated switched capacitor converter can further include a regulated converter coupled to the tail voltage rail that provides voltage regulation of the output voltage rail while carrying half of a full output current of the tail regulated switched capacitor converter.

The invention discloses an adjustable self-bias closed-loop ring amplifier which comprises a first-stage MOS tube, a second-stage MOS tube, a third-stage MOS tube and a bias resistor unit, each stage of MOS tube comprises two MOS tubes, grid electrodes of the two MOS tubes of the first-stage MOS tube are connected and then connected with an input node, an output of the first-stage MOS tube is connected with grid electrodes of the two MOS tubes of the second-stage MOS tube, and the bias resistor unit is connected with the first-stage MOS tube and the second-stage MOS tube. The bias resistor unit is connected between drain electrodes of two MOS tubes in the second-stage MOS tube, partial voltage of the bias resistor unit is used for generating a first bias voltage and a second bias voltage, the first bias voltage and the second bias voltage are respectively connected with grid electrodes of two MOS tubes of the third-stage MOS tube, and an output end of the third-stage MOS tube is used for outputting voltage to a rear-end circuit. The adjustable self-biased closed-loop ring amplifier can quickly amplify residual voltage, is suitable for high-speed occasions, can also realize higher gain, and can work in a sub-threshold value by biasing the MOS tube, so that the stability of the adjustable self-biased closed-loop ring amplifier is improved. The invention further discloses a switched capacitor circuit comprising the adjustable self-biased closed-loop ring amplifier.

This invention discloses a load transient detection circuit for a COT Buck converter, along with a corresponding COT Buck and a switching power supply. The load transient detection circuit includes an input terminal, three resistors connected in series, two comparators, and a switched-capacitor sample-and-hold circuit. The input terminal is grounded after passing through the three resistors. The nodes between the input terminal and the first resistor, and between the second and third resistors, are connected to the input terminals of the first and second comparators via the switched-capacitor sample-and-hold circuit. The valley and peak voltage information of the inductor current is obtained through the switched-capacitor sample-and-hold circuit. By comparing the inductor current ripple with the valley and peak values, a transient change in the load is determined, ensuring that the switching power supply has a suitable transient detection trigger threshold voltage under any load. The COT Buck of this invention increases the on or off time based on the output signal of the load transient detection circuit to enhance the transient response speed.

The application discloses a high-side power tube driving circuit and method applied to a 4:1 switched capacitor voltage converter. The internal node voltage of the switched capacitor voltage converter with an input-output voltage conversion ratio of 4:1 is utilized to change in the switching action process, three bootstrap capacitors and two power sources VIN and REGN are used to drive four high-side power tubes in the voltage converter by controlling the switching sequence, and the source following structure is avoided, so that the chip cost area can be saved, the power consumption is reduced, and the chip conversion efficiency is improved on the basis of ensuring high reliability.

Provided are a switched-capacitor voltage converter, a chip, and an electronic device. The switched-capacitor voltage converter performs a buck or boost operation on the input voltage based on the different charging and discharging states of the capacitors and the different states of the first and second branches in different stages. The current of the transistors in the switched-capacitor voltage converter may be instantaneously zero, thereby significantly reducing the switching loss of the transistors. Moreover, the capacitors are not subject to conduction loss, such that the power loss of the switched-capacitor voltage converter is further reduced.

The invention relates to a linearity detection system for an input buffer, and the system comprises a main buffer, a terminating resistor unit, an auxiliary buffer, a switched capacitor unit, an observation comparator, and a judgment unit. The input end of the main buffer and the first input end of the terminating resistor unit receive input signals respectively; the second input end of the terminating resistor unit is connected to a first common-mode voltage, the output end of the terminating resistor unit is connected to the input end of the auxiliary buffer, and the output end of the auxiliary buffer and the output end of the main buffer are connected to the input end of the observation comparator through the switched capacitor unit. The output end of the observation comparator is connected to the input end of the judgment unit, and the output end of the judgment unit is connected to the output end of the main buffer; the determination unit is used for determining a determination result for the main buffer and determining a compensation mode. The current linearity state of the main buffer can be rapidly detected in real time and a corresponding compensation mode can be obtained on the premise that a main signal chain is not interfered.

The utility model relates to chip calibration technical field, especially, a kind of beamformer and ultrasonic chip, including the calibration circuit being coupled with sampling circuit, the relationship between the sampling capacitor C s And parasitic capacitance C p Between by the calibration circuit is indeed, to realize the calibration of the relationship between the input signal and output signal of the sampling circuit, avoid the influence of parasitic capacitance and ultrasonic chip output signal bandwidth, realize the decoupling of the limiting relationship of parasitic capacitance and ultrasonic chip output signal bandwidth, so that the switch capacitor circuit of ultrasonic chip can adopt smaller sampling capacitor, more simple layout layout reaches sufficient bandwidth simultaneously;Smaller sampling capacitor greatly reduces chip area, while reducing the load of front-stage circuit, thereby reducing the power consumption of chip.

The utility model relates to a kind of ladder form switch capacitor conversion circuit, conversion circuit includes ladder determination module, switch control module, output capacitor at least one flying capacitor;Current input end is connected with voltage output end in turn through at least two switch tubes, voltage output end is also grounded through output capacitor;One end of flying capacitor is connected between voltage input end and the common point of adjacent two switch tubes of voltage output end, its other end is grounded through a switch tube, and also be connected to the common point of output capacitor and voltage output end through another switch;When the ratio of input voltage and output voltage is non-integer, switch control module controls the charge-discharge process of flying capacitor, so that the voltage of last flying capacitor is equal to output voltage or input voltage.The present application realizes the efficient conversion of fixed integer ratio and / or non-integer ratio of input and output voltage by the switch capacitor control mode of multiple ladder, using the ladder voltage variation of flying capacitor.

The present application relates to the field of integrated circuits and photoelectric detection technology, in particular to a low-noise hybrid domain CMOS detector readout circuit.The circuit includes a capacitance feedback transimpedance amplification unit, a switched capacitor reference unit, an analog domain readout unit, a time domain quantization unit and an output selection unit.The transimpedance amplification unit converts the pixel current into voltage.The switched capacitor reference unit filters out the reference voltage noise in the reset stage and maintains the reference potential in the integration stage.The analog domain readout unit outputs analog voltage, and the time domain quantization unit outputs digital time code through saturation time detection.The output selection unit defaults to output analog signal, and switches to digital output when the transimpedance amplifier output voltage reaches the preset threshold.The present application also provides a corresponding readout method.The present application can effectively filter out the reference voltage source noise and power supply ripple, significantly improve the signal-to-noise ratio of micro-light detection, realize high dynamic range in a single frame, significantly expand the linear response range of the detector, and can be integrated on chip.

The application belongs to the technical field of switching power supply, and an auxiliary circuit is added between two branches of a traditional two-phase Dickson converter; in a dead time when all main power tubes are closed, the auxiliary circuit can transfer the charge of one branch to another branch, realizes zero-voltage turn-on of all main power tubes, and reduces switching loss.

The invention relates to a hybrid oversampling analog-to-digital converter. A circuit (100) includes a switched capacitor amplifier circuit (102), a multi-bit quantizer circuit (104), an accumulator circuit (106), a loop result register (110), and a result combining circuit (112). The switched capacitor amplifier circuit (102) has an output. The multi-bit quantizer circuit (104) has an input and an output, the input coupled to the output of the switched capacitor amplifier circuit (102). The accumulator circuit (106) has an input and an output, the input coupled to the output of the multi-bit quantizer circuit (104). The loop result register (110) has an input and an output, the input coupled to the output of the multi-bit quantizer (104). The result combining circuit (112) has a first input coupled to the output of the accumulator circuit (106) and a second input coupled to the output of the loop result register (110).

The application discloses an inverter which is composed of a switched capacitor circuit and a bridge switching circuit; the switched capacitor circuit and the bridge switching circuit are connected with each other; the bridge switching circuit is composed of a left half bridge switching circuit and a right half bridge switching circuit; the left half bridge switching circuit and the right half bridge switching circuit are connected with the switched capacitor circuit respectively. The inverter contains a single direct current input source, six switching tubes, one capacitor and one inductor; the process of charging and discharging of the capacitor in a capacitor period realizes self-balancing of the capacitor voltage, each capacitor keeps the same working state, and stable output of the inverter is realized.

This invention discloses a high-gain, low-device voltage stress, common-ground non-isolated DC-DC boost converter, comprising: a Stage I hybrid active boost module for front-end boosting, consisting of two inductors, two capacitors, two switching transistors, two diodes, and an input source; a Stage II switched-capacitor boost module for secondary boosting and output filtering, consisting of three capacitors and three diodes; and an output module consisting of a load. This DC-DC boost converter constructs a non-isolated, input-output common-ground converter, achieving extremely high voltage gain without duty cycle limitations, extremely low device voltage stress, and continuously low-ripple input current. The device size is small, compact, lightweight, and easy to control. Furthermore, through specific parameter design, the converter eliminates instantaneous current spikes during mode switching of the switched-capacitor units. Therefore, the converter possesses advantages such as high gain, low stress, low ripple, high reliability, and high power density.

A voltage measurement circuit (23) is provided with: a first switched capacitor filter (9) connected to a first cell (C2) constituting a battery pack (50); a second switched capacitor filter (10) connected to a second cell (C3) constituting the battery pack (50); and a first amplifier (19) shared by the first switched capacitor filter (9) and the second switched capacitor filter (10), the first switched capacitor filter (9) comprising a first switch group (3), a first capacitor (5) and a third switch group (4), and the second switched capacitor filter (10) comprising a second switch group (6), a second capacitor (8) and a fourth switch group (7), the first switching group (3) and the second switching group (6) are electrically insulated from the third switching group (4) and the fourth switching group (7) by the first capacitor (5) and the second capacitor (8), respectively.

Device for operating a passive infrared (PIR) detector with a first connection (IN) and a second connection (IP), the device comprising: - an electrical circuit arrangement (R G ), wherein the electrical circuit arrangement (R G ) forms a leakage resistance between the first terminal (IN) and the second terminal (IP) of the passive infrared detector (PIR) to discharge the first terminal (IN) and the second terminal (IP) of the passive infrared detector (PIR); wherein the electrical circuit arrangement (R G ) includes a switch-capacitor circuit with transfer gates and storage capacities; and the device is set up for this purpose: - the transfer gates of the electrical circuit arrangement (R G) to switch alternately with a first clock (φ1) and a second clock (Φ2), and to advance a charge quantity by one node with each half-clock using the storage capacities, whereby the first clock (φ1) and the second clock (Φ2) do not overlap and, apart from the non-overlap, the first clock (φ1) is the inverse of the second clock (Φ2); and - to switch off the first clock (φ1) and the second clock (Φ2) during a measurement phase, so that the device is in a measurement state and the charge flow through the electrical circuit arrangement (R G ) is prevented.

This invention relates to an active dual-switched capacitor coupled DC / DC converter with a reverse magnetic winding, belonging to the field of optics. It solves the problem that existing DC converters cannot simultaneously achieve low turns ratios and high voltage gain. The invention combines inductors, capacitors, diodes, and coupled inductors (N1, N2) in a specific series-cross connection to form an integrated high-gain unit. Through a reverse-coupled inductor voltage multiplier circuit (composed of multi-winding coupled inductors N1 and N2 connected in reverse, diode D1, and capacitor C1) and an active dual-switched capacitor structure (composed of power switches S1 and S2, capacitor C2, and diodes D2 and D3), the proposed converter can generate high voltage gain at low turns ratios. This invention is primarily applied in high boost ratio DC power conversion applications.

A system and method for measuring mutual inductance between adjacent first communication transmission line and second communication transmission line is disclosed. The system includes a mutual inductance measurement circuit that includes a coupling generator which biases the first communication transmission line with a current ramp signal; a sample and hold circuit which captures an induced voltage on the second communication transmission line using a switched capacitor storage element; a switched capacitor integrator configured to integrate the induced voltage onto an output voltage node; and a comparator configured to switch states once the switched capacitor integration has surpassed a reference trippoint.

Devices, systems, and methods providing for improved detection of a high frequency component in an input signal are described. A detector includes a detector stage configured to receive an input signal and generate a detection signal that represents the input signal. The detector also includes an amplifier stage that configured to receive the detection signal from the detector stage and amplify the detection signal to generate an output signal that indicates whether the input signal includes a high frequency component. In some examples, the detector stage includes a switched cap detector and the amplifier stage includes a first switched cap amplifier and a second switched cap amplifier. In some examples, the switched cap detector and the first switched cap amplifier are operated responsive to a first clock signal, and the second switched cap amplifier is operated responsive to a second clock signal different than the first clock signal.