21results about "One-port active networks" patented technology

The utility model relates to the technical field of switch filters, in particular to a switch filter assembly, which comprises a plurality of filters, a controller, a channel switching module and a monitoring module. The monitoring module monitors the working condition of each channel switching module in real time, and if a certain channel switching module breaks down and all channels are switched on, the monitoring module immediately controls all the channel switching modules to be in a switched-off state; according to the utility model, the filters are divided into the first-stage filter and the second-stage filter, and the channel switching module is arranged between the first-stage filter and the second-stage filter, so that the filter can receive various types of frequency signals, and can output different types of frequency signals. According to the utility model, the problem of the filter channel switching module in the aspect of stable control of channel connection and disconnection is solved.

Two defense mechanisms, a hardware-based and software-based solution, are provided to protect a device during charging. The defenses randomly perturb the current drawn during charging thereby masking the unique patterns of the user's activities. It is shown that the two defenses force each one of the attacks to perform no better than random guessing, thus acting as effective defense mechanisms against all such types of attacks.

A pseudo-resistor control circuit and a pseudo-resistor providing device. The pseudo-resistor control circuit comprises a threshold voltage control module (10) and an adjustment module (20). An input end of the threshold voltage control module (10) is used for inputting a reference voltage (Vref). A control end of the threshold voltage control module (10) is connected to a control voltage (Vctrl). The threshold voltage control module (10) is used for converting the control voltage (Vctrl) into a control current. An input end of the adjustment module (20) is connected to an output end of the threshold voltage control module (10). An output end of the adjustment module (20) is connected to a control end of a pseudo-resistor (30). A control end of the adjustment module (20) and a first end of the pseudo-resistor (30) are connected to a first input voltage (Va). A second end of the pseudo-resistor (30) is connected to a second input voltage (Vb). The adjustment module (20) is used for adjusting a potential of the control end of the pseudo-resistor (30) on the basis of the first input voltage (Va) and the control current, so that the resistance of the pseudo-resistor (30) changes with the first input voltage (Va) and the second input voltage (Vb). The pseudo-resistor control circuit having such design has a simple structure and involves low costs.

The present invention discloses a miniaturized high-suppression LTCC columnar inductor bandpass filter, comprising a ceramic substrate, an external input electrode, an external output electrode, and an external grounding electrode; the ceramic substrate includes four parallel resonators, two grounding plates, five series-connected capacitors, and a source-load coupling capacitor. The present invention has the advantages of miniaturization, high proximal suppression, low cost, high batch consistency, and novel structure.

An impedance circuit includes a first poly-resistor and a second poly-resistor. The first poly-resistor has a first terminal coupled to a first node, and a second terminal coupled to a second node. The second poly-resistor has a first terminal coupled to the first node, and a second terminal coupled to the second node. The resistance between the first terminal and the second terminal of the first poly-resistor is determined according to a first control voltage. The resistance between the first terminal and the second terminal of the second poly-resistor is determined according to a second control voltage. The first control voltage and the second control voltage are determined according to a first voltage at the first node and a second voltage at the second node.

This disclosure relates to a filter circuit for an output stage of electronic circuit, the filter comprising: a capacitor connected between a supply voltage and a first transistor wherein the first transistor is arranged as a diode connected transistor; a second transistor connected to the first transistor such that the first and second transistors are arranged as a current mirror; wherein the capacitor is connected to the first and second transistors and configured and arranged such that during operation the first transistor, the second transistor and the capacitor operate as a high pass filter.

This application provides a signal processing circuit and an electronic device. The signal processing circuit includes: a charge amplifier circuit for receiving a differential charge signal output from a sensor; amplifying and converting the differential charge signal to output a first voltage signal; a non-inverting amplifier circuit connected to the charge amplifier circuit for receiving the first voltage signal; amplifying the first voltage signal to output a second voltage signal; a voltage-controlled filter circuit connected to the non-inverting amplifier circuit for receiving the second voltage signal; amplifying and filtering the second voltage signal to output a third voltage signal; and a hysteresis comparator circuit connected to the voltage-controlled filter circuit for receiving the third voltage signal and comparing it to obtain a stable square wave signal. The solution provided in this application can effectively suppress common-mode noise signals, has a fast response speed, is less affected by circuit impedance, and produces a better square wave signal output.

The present invention discloses a signal processing circuit powered by a single power supply, belonging to the technical field of signal processing circuits. An APD receives a signal as a signal, and converts the current signal output by the APD into a voltage signal through a resistor R10. The signal is passed through a differential amplifier U3A to amplify the received signal accordingly. The power supply voltage in the circuit is +VCC-GND. R21 and R22 are connected in parallel, and have the functions of matching the differential circuit and the high reference value. R22 and R21 raise the reference voltage of the U3A output signal from GND to VCC / 2, and then a part of the useless high-frequency signal is filtered out through a high-pass filter, and the useful signal is amplified again. In this way, the functions of improving signal quality and reducing signal noise can be achieved.

To obtain desired voltage-capacity characteristics by adding a peripheral circuit even in a case where a variable capacitance element with a small capacity variable ratio is used.SOLUTION: An electronic circuit comprises: a DC voltage source; a first variable capacitance element whose cathode is connected with the DC voltage source via a first resistor and whose anode is grounded; a second variable capacitance element whose cathode is connected with the DC voltage source via the first resistor and a second resistor and whose anode is grounded; and a transistor whose gate is applied with a predetermined voltage, whose drain is connected with a connection point between the first resistor and the second resistor, and whose source is connected with a connection point between the second resistor and the second variable capacitance element.SELECTED DRAWING: Figure 5

The present disclosure relates to a filter circuit for an output stage of an electronic circuit, the filter comprising: a capacitor connected between a supply voltage and a first transistor, wherein the first transistor is arranged as a diode-connected transistor; a second transistor connected to the first transistor such that the first transistor and the second transistor are arranged as a current mirror; wherein the capacitor is connected to the first transistor and the second transistor and is configured and arranged such that during operation the first transistor, the second transistor and the capacitor operate as a high-pass filter.

The utility model discloses a numerical control frequency modulation filter and a voltage converter. Wherein the voltage converter comprises field effect transistors Q1 and Q2, diodes D1 and D2, resistors R1, R2 and R3 and an inductor L23; one end of the resistor R3 is connected with the grid electrode of the field effect transistor Q2, and the source electrode of the field effect transistor Q2 is connected with a power supply; the diode D2 is connected with the inductor L23 in parallel, one end of the parallel connection is connected with the drain electrode of the field effect transistor Q2 and the grid electrode of the field effect transistor Q1, and the other end of the parallel connection is connected with the cathode of the diode D1; after the resistor R2 and the resistor R1 are connected in series, the resistor R2 is connected with the drain electrode of the field effect transistor Q2, and the resistor R1 is connected with the drain electrode of the field effect transistor Q1; the source electrode of the field effect transistor Q1 is connected with the anode of the diode D1; and a power supply is connected between the connecting lines of the resistor R2 and the resistor R1. According to the ultra-high-speed switching circuit of the utility model, the principle that the inductor can hinder sudden change of current is utilized, the gate-source voltage of the field-effect transistor is rapidly increased, and the field-effect transistor is rapidly conducted, so that the frequency hopping speed of the high-power frequency hopping filter reaches within 10us.

Embodiments of the present disclosure provide a filter, an integrated passive device, an electronic device, and a display apparatus. The filter is applied in the field of radio frequency and includes: a first port, a second port, a first band-stop filter circuit, a low-pass filter circuit, a band-pass filter circuit, and a high-pass filter circuit. The first band-stop filter circuit is coupled to the first port, and is configured to perform out-of-band suppression on a signal input from the first port and input a signal subjected to the out-of-band suppression to the low-pass filter circuit. The low-pass filter circuit is configured to input a first signal, a frequency of which is between a first frequency and a second frequency, of the signal input by the first band-stop filter circuit to the band-pass filter circuit.

A digital variable reactance element with variable width is provided. A digital variable reactance element (1) is provided with a plurality of digital capacitors (2) and a plurality of digital inductors (4), the plurality of digital capacitors (2) and the plurality of digital inductors (4) are connected in series or in parallel, and each of the plurality of digital capacitors (2) has a capacitor (C1) and a first digital switch (Q) connected in series or in parallel. The first digital switch (Q) can be switched between an on state and an off state, each of the plurality of digital inductors (4) has an inductor (L1) and a second digital switch (Q) which are connected in series or in parallel, and the second digital switch (Q) can be switched between an on state and an off state.

The utility model discloses a low-power-consumption traveling wave low-pass filter based on a single power supply. The low-power-consumption traveling wave low-pass filter comprises an operational amplifier and the single power supply, an in-phase input end of the operational amplifier is connected with a signal input end after passing through a resistor R9, a resistor R8 and a resistor R6, the in-phase input end and the resistor R9 are grounded through a capacitor C19, the resistors R9 and R8 are connected with an output end of the operational amplifier through a capacitor C18, the resistors R8 and R6 are connected with a power supply after passing through a resistor R7 and a resistor bridge circuit, and the resistor bridge circuit is connected with the power supply. A grounding capacitor C20 and a grounding resistor R10 are respectively connected between the resistor R7 and the resistance bridge circuit; the resistance bridge circuit is further connected with the inverting input end and the output end OUT of the operational amplifier, and the output end OUT is connected with the signal output end. According to the utility model, by using the specially designed single power supply type low-pass filter, the low power consumption characteristic is realized while the filtering performance is ensured, and the low-power consumption low-pass filter can be adapted to products with high requirements on low power consumption, such as a cable monitoring device and a distributed fault monitoring device, and is wide and flexible in application range.

The utility model discloses a filter suitable for a high-altitude low-pressure environment, which comprises a resonant cavity, a radio frequency resonant circuit is arranged in the resonant cavity, pouring sealant is filled in the resonant cavity, and the pouring sealant at least completely submerges the radio frequency resonant circuit in the resonant cavity; wherein the radio frequency resonant circuit comprises a resonant inductor, a diode and a resonant capacitor; one end of the resonant inductor is welded on the wall of the resonant cavity and is a short-circuit end, and the other end of the resonant inductor is connected with the cathode of the diode and the resonant capacitor; and the anode of the diode is welded on the structural wall of the resonant cavity. According to the utility model, the internal gap of the frequency hopping filter is filled with the pouring sealant, and the pouring sealant replaces air to serve as an insulating medium in a high-altitude low-pressure environment, so that the possibility of sparking of the high-power frequency hopping filter in a full-power state is avoided.

The invention discloses a filtering shaping circuit applied to a front-end reading system of a radiation detector, which solves the problem of low quality of an output waveform of an existing filtering shaping circuit, and specifically comprises a resistor R3, a capacitor C3, a capacitor C4 and the like, one end of the resistor R3 is an input port Vin of the filtering shaping circuit, and the other end of the resistor R3 is connected with one end of the capacitor C3; the other end of the capacitor C3 is connected with the inverted input end of the differential operational amplifier A2; the capacitor C4 is bridged between the inverted input end and the output end of the differential operational amplifier A2; the output end of the differential operational amplifier A2 is the output port Vout of the filtering shaping circuit, and the in-phase input end of the differential operational amplifier A2 is grounded or connected with an external power supply VREF; the input port IN of the active high-resistance sub-circuit R4 is connected with the output end of the differential operational amplifier A2, the output port OUT of the active high-resistance sub-circuit R4 is connected with one end of the polar zero cancellation capacitor Cpz, and the voltage bias port VB of the active high-resistance sub-circuit R4 is grounded or connected with an external power supply; and the other end of the polar zero cancellation capacitor Cpz is connected with the inverted input end of the differential operational amplifier A2.

The utility model belongs to the technical field of flow meters, and provides a flow meter filter circuit which comprises a charge amplifier, a program control second-order low-pass filter and a first-order high-pass filter which are sequentially connected, the input end of the charge amplifier is connected with a sensor, and the output end of the charge amplifier is connected with the program control second-order low-pass filter. The first-order high-pass filter and the program-controlled second-order low-pass filter both comprise digital potentiometers, and the filtering frequency band is adjusted by adjusting the digital potentiometers. According to the utility model, the flexible adjustment of the filtering band is realized by adjusting the digital potentiometer, and the flexible multi-point setting of the signal filtering band of the flowmeter is realized; meanwhile, by adjusting capacitors with different capacitance values connected with the charge amplifier, the signal amplification factor of the sensor can be dynamically adjusted.

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.

Provided is a digital variable reactance element that has a wide variable width. A digital variable reactance element 1 comprises a plurality of digital capacitors 2 and a plurality of digital inductors 4. The plurality of digital capacitors 2 and the plurality of digital inductors 4 are connected in series or in parallel. Each of the plurality of digital capacitors 2 has a capacitor C1 and a first digital switch Q that are connected in series or in parallel, and the first digital switch Q can be switched between two states, which are an on-state and an off-state. Each of the plurality of digital inductors 4 has an inductor L1 and a second digital switch Q that are connected in series or in parallel, and the second digital switch Q can be switched between two states, which are an on-state and an off-state.

Provided is a digital variable reactance element that has a wide variable width. A digital variable reactance element 1 comprises a plurality of digital capacitors 2 and a plurality of digital inductors 4. The plurality of digital capacitors 2 and the plurality of digital inductors 4 are connected in series or in parallel. Each of the plurality of digital capacitors 2 has a capacitor C1 and a first digital switch Q that are connected in series or in parallel, and the first digital switch Q can be switched between two states, which are an on-state and an off-state. Each of the plurality of digital inductors 4 has an inductor L1 and a second digital switch Q that are connected in series or in parallel, and the second digital switch Q can be switched between two states, which are an on-state and an off-state.