10results about How to "High sampling rate" patented technology

The invention discloses a bootstrapped switching circuit for SAR ADC, which comprises a voltage control unit and a switching tube unit, the voltage control unit comprises a first capacitor and a second capacitor which are connected in parallel, one end of the first capacitor and one end of the second capacitor are both connected with an external power supply, and the other end of the first capacitor and the other end of the second capacitor are both connected with the switching tube unit; the switch tube unit comprises a switch MOS tube, a first MOS tube and a second MOS tube, the grid electrode of the switch MOS tube is connected with the other end of the first capacitor and the other end of the second capacitor, when the capacitors discharge, the voltage of the grid electrode of the switch MOS tube is increased to two times of the voltage of the power supply, the substrate of the switch MOS tube is connected with the drain electrode of the first MOS tube and the source electrode of the second MOS tube, the drain electrode of the second MOS tube is connected with the source electrode of the switch MOS tube, and the grid electrode of the switch MOS tube is connected with the source electrode of the second MOS tube. And the grid electrode is connected with the grid electrode of the switch MOS tube. According to the bootstrapped switching circuit, the electric leakage behavior of the switching MOS tube is prevented, the on resistance of the switching MOS tube is reduced, and the sampling rate of the SAR ADC is increased.

The invention discloses a handheld digital oscilloscope which comprises a main control chip. The attenuation circuit is provided with four input resistors, and each parallel compensation capacitor and the adjustable capacitor form a resistor-capacitor pair; the in-phase input end of a first operational amplifier is connected with the attenuation circuit, and a feedback resistor is arranged between the anti-phase input end and the output end of the first operational amplifier; the first adder circuit and the second operational amplifier eliminate direct current bias of the alternating current signal; the second adder circuit and the third operational amplifier perform direct current lifting on the signal and then input the signal into the main control chip; the fourth operational amplifier is connected with the second adder circuit, and the inverted input end of the fourth operational amplifier is connected with three feedback resistors in parallel; the high-speed comparator circuit outputs TTL level signals; the key circuit and the keyboard management chip are connected with the main control chip; the power circuit supplies power. Therefore, the device has the advantages of high measurement precision, good sampling performance, rich and practical functions, convenient man-machine interaction and the like.

The invention discloses a noise reduction frequency multiplication sampling circuit and sampling method for a phase discrimination type sensor, and belongs to the technical field of electronic circuit phase measurement. The noise reduction frequency multiplication sampling circuit comprises an amplification circuit, a clamping circuit, a resonance circuit and a comparison circuit which are connected in sequence. The clamping circuit is used for carrying out clamping processing on the amplified sine alternating-current signal so as to shape the sine alternating-current signal into a trapezoidal signal, and the resonance circuit oscillates the trapezoidal signal to generate a high-frequency signal; the comparison circuit converts the high-frequency signal into a square wave signal. The signal frequency is effectively improved under the condition that the original signal frequency is not changed from the hardware level, the input signal is subjected to high-frequency change only by adjusting the values of the inductance and the capacitance of the resonance circuit, the frequency multiplication times are not influenced by the operational amplifier, and the purpose of high-frequency sampling of the low-frequency signal is achieved. And the signal is converted into a square wave signal through frequency multiplication, and data acquisition is carried out at a rising edge and a falling edge of the square wave signal, so that high-resolution sampling can be realized.

This invention belongs to the field of analog integrated circuit technology, specifically relating to an 8-bit ADC circuit with step-by-step multi-bit quantization; it includes: a SIG-DAC capacitor array receiving differential input signals VIP and VIN, connected to a first enable signal module and 5 comparators, used for successive approximation of the main signal; a REF-DAC capacitor array receiving differential input signals VREFP and VREFN, connected to a second enable signal module and 5 comparators, used to generate a threshold voltage; an asynchronous clock module connected to the second enable signal module, a latch array, and 5 comparators; the latch array consists of 17 latch circuits, and is also connected to the first enable signal module, 5 comparators, and 2 decoder modules connected in series; this invention increases the overall performance of the ADC without adding an extra clock phase, increases the ADC's tolerance to comparison errors, requires fewer total clock cycles, and simplifies the asynchronous clock module.

The invention belongs to the technical field of ambient air monitoring, and provides a semi-passive air sampler which comprises a main shell, a sampling pipe is detachably connected in the main shell, the sampling pipe is filled with a gaseous pollutant adsorbent, an air entraining head is arranged above the main shell, the air entraining head is communicated with the air inlet end of the sampling pipe, and the air entraining head is communicated with the air inlet end of the sampling pipe. A lifting assembly is arranged between the air entraining head part and the main shell; the auxiliary shell is detachably connected to the main shell through a buckling piece, an air outlet channel is formed in the auxiliary shell, one end of the air outlet channel is communicated with the air outlet end of the sampling pipe, the other end of the air outlet channel is vertically communicated with an air cylinder, a solar heating mechanism is arranged in the air cylinder, and the solar heating mechanism is used for heating air at the bottom of the air cylinder; and air in the air outlet duct is driven to flow into the air duct. Passive driving can be achieved through solar energy, semi-passive air collection is achieved, and meanwhile the sampling height can be flexibly adjusted.

The invention discloses a miniaturized Beidou III dual-frequency down-conversion board, comprising a dual-frequency down-conversion module, wherein the dual-frequency down-conversion module is arranged between a low-noise amplifier and a whole mainboard of a receiver, and comprises a feeding circuit, an amplifying circuit, a power dividing circuit, a B3 filtering circuit, a B1c filtering circuit, a frequency conversion processing circuit, and a power conversion circuit. The invention completes the superheterodyne receiving function of Beidou III satellite navigation signals, and provides corresponding intermediate frequency digital signal output, thereby providing intermediate frequency information for Beidou III satellite positioning and navigation solution.

The application relates to the technical field of chip circuits, in particular to a special chip ADC circuit for a retinal prosthesis, which comprises a sampling switch module, a capacitor array module, a dynamic comparator, a digital control logic module and a digital correction module; the capacitor array module comprises a P-end capacitor array and an N-end capacitor array, the P-end capacitor array comprises a plurality of first capacitors connected in parallel, and each first capacitor is connected with a first control switch; the N-end capacitor array comprises a plurality of second capacitors connected in parallel, and each second capacitor is connected with a second control switch; the same direction end of the dynamic comparator is connected with the end capacitor of the P-end capacitor array, and the reverse end of the dynamic comparator is connected with the end capacitor of the N-end capacitor array; the digital control logic module is connected with the output end of the dynamic comparator; and the digital correction module is connected with the output end of the digital control logic module. The ADC circuit provided by the application is used for converting a sensor analog signal into a digital signal and realizes low power consumption and high resolution.

The present invention discloses a gate voltage bootstrap switch circuit for a SAR ADC, which includes a voltage control unit and a switch transistor unit. The voltage control unit includes a first capacitor and a second capacitor connected in parallel. One end of each of the first capacitor and the second capacitor is connected to an external power supply, and the other end of each is connected to the switch transistor unit. The switch transistor unit includes a switch MOS transistor, a first MOS transistor, and a second MOS transistor. The gate of the switch MOS transistor is connected to the other ends of the first capacitor and the second capacitor. When the capacitors discharge, the gate voltage of the switch MOS transistor rises to twice the power supply voltage. The substrate of the switch MOS transistor is commonly connected to the drain of the first MOS transistor and the source of the second MOS transistor. The drain of the second MOS transistor is connected to the source of the switch MOS transistor, and its gate is connected to the gate of the switch MOS transistor. The gate voltage bootstrap switch circuit of the present invention prevents the leakage behavior of the switch MOS transistor, reduces the on-resistance of the switch MOS transistor, and accelerates the sampling rate of the SAR ADC.

The application relates to the technical field of in-pipe detection, in particular to a high-density special-shaped probe circuit board structure. The circuit board structure comprises a circuit board top plate and a magnetic field sensor; the circuit board top plate comprises a first mounting part and a second mounting part, a plurality of magnetic field sensors are horizontally arranged on the first mounting part and the second mounting part respectively, and the first mounting part and the second mounting part are arranged in a staggered mode on a horizontal projection plane and form a first gap and a second gap for connecting other circuit board top plates in a diagonal direction. The application can effectively improve the arrangement density of the magnetic field sensors, and further improve the sampling rate, accuracy and integrity of the magnetic field sensors in picking up a leakage magnetic field.

The present invention proposes a device and method for measuring high-frequency harmonics of direct current transmission, which belongs to the technical field of high-frequency harmonic measurement. The measuring device comprises: a digital-to-analog conversion module, a photoelectric conversion module and a main control module; the main control module comprises a first processor and a second processor, the first processor is used to obtain an initial direct current voltage signal and a rated voltage signal, and the second processor is used to perform data calculation on the initial direct current voltage signal and the rated voltage signal obtained by the first processor and obtain a high-frequency harmonic signal. The present invention provides a miniaturized and portable measuring device that can solve sampling errors and realize accurate measurement of high-frequency harmonics.