46 results about "Limiting amplifier" patented technology

The invention belongs to the technical field of integrated circuit signal processing, and discloses a temperature compensation circuit for a logarithmic detector and the logarithmic detector thereof, and the temperature compensation circuit for the logarithmic detector comprises a first temperature compensation module, a second temperature compensation module and a third temperature compensation module. The first temperature compensation module is used for performing temperature compensation on the current summation module, the second temperature compensation module is used for performing temperature compensation on bias voltage and current of the limiting amplifier module, and the third temperature compensation module is used for performing temperature compensation on bias voltage and current of the rectifier module. The logarithmic detector temperature compensation circuit is suitable for performing temperature compensation on the current summation module, the limiting amplifier module and the rectifier module of the logarithmic detector, and the output precision and consistency of the logarithmic detector are improved.

In an optical module provided in the present disclosure, a first light-receiving component receives a fourth-wavelength optical signal, a fifth-wavelength optical signal and a sixth-wavelength optical signal which are reflected by a first reflector, and outputs a first voltage signal, a second voltage signal or a third voltage signal; a gold finger, an MCU, a first limiting amplifier, a second limiting amplifier and a filtering circuit are provided on a circuit board; an input end of the first limiting amplifier and an input end of the second limiting amplifier are connected to the first light-receiving component by means of the filtering circuit; the filtering circuit bypasses the second voltage signal to the first limiting amplifier, such that the first limiting amplifier processes the second voltage signal and then transmits the processed second voltage signal to the gold finger; and the MCU controls and is connected to the second limiting amplifier so that, by means of the control signal, the second limiting amplifier processes the first voltage signal or the third voltage signal and then transmits the processed first voltage signal or the processed third voltage signal to the gold finger by means of a corresponding output end.

The invention provides a hundred-time frequency range ultra-wideband frequency conversion circuit, a hundred-time frequency range ultra-wideband frequency conversion structure and a miniaturization design method of the hundred-time frequency range ultra-wideband frequency conversion circuit. The hundred-time frequency range ultra-wideband frequency conversion circuit comprises an amplitude limiting amplification circuit, the frequency division preselection filtering module is used for carrying out segmented filtering on the ultra wide band radio frequency signal so as to reduce the influence of a harmonic signal and an out-of-band spurious signal on the circuit; the multi-stage frequency mixing module is used for mixing frequency; the local oscillation module is used for driving the multi-stage frequency mixing link to perform frequency conversion; the ultra-wideband frequency conversion circuit realizes ultra-wideband frequency conversion. The invention further designs a frequency conversion structure based on the circuit, the structure adopts a ceramic three-dimensional stacked structure design, grooves are formed in corresponding ceramic tube shells, the corresponding circuits are arranged in the corresponding grooves or formed cavities, and the circuits are isolated through a sealing process; the problem of low integration level of a circuit system in the prior art is solved through the frequency conversion structure.

The embodiment of the utility model provides an amplitude limiting amplification circuit and a radio frequency transceiver chip, the amplitude limiting amplification circuit comprises one stage of amplification units or multiple stages of amplification units connected in series, and each stage of amplification unit at least comprises an amplification transistor; the detection unit is connected with the signal input end of the amplitude limiting amplification circuit and used for detecting the input signal received by the amplitude limiting amplification circuit and then outputting a detection signal, and the amplitude of the detection signal is in positive correlation with the power of the input signal; at least one stage of amplification unit is provided with an amplitude limiting unit, the signal input end is connected with the control end of the amplification unit and the signal input end of the amplitude limiting amplification circuit, and the control end is connected with the signal output end of the detection unit; the detection signal is used for controlling on and off of the amplitude limiting unit; at least one end of the diode protection unit is connected with the control end of the amplification transistor, the diode protection unit comprises a forward diode string and / or a backward diode string, and the diode string comprises a diode or a plurality of diodes connected in series.

The invention discloses a wireless optical communication system adopting an amplitude limiting amplification method, which relates to the technical field of wireless optical communication and comprises a transmitting subsystem and a receiving subsystem. The transmitting subsystem is used for generating a serial signal, processing the serial signal, converting the serial signal into an optical signal and transmitting the optical signal; and the receiving subsystem is used for receiving and converting the optical signal into a current signal, converting the current signal into a signal in a voltage form, amplifying the signal, performing waveform shaping and effective bandwidth expansion on the amplified signal through the nonlinear amplitude limiting characteristic of a bandwidth expansion module, and decoding and recovering the signal after bandwidth expansion. According to the invention, the bandwidth of the system is directly expanded by using the nonlinear amplitude limiting characteristic of the amplitude limiting amplifier, so that Gbps-level transmission is realized, and the rate bottleneck of the traditional LED system is overcome. Complex transmitting end equalization is not needed, the design is simplified, the robustness is enhanced, and the stability requirement of a satellite-borne environment high-speed link is met.

A delay circuit comprises a receiver for an incoming signal, a limiting amplifier, configured to receive and process the incoming signal, a fixed delay line configured to introduce a predetermined time delay to the signals down-or-up-stream the power controlling circuit.A radar target simulator system using such delay circuit may provide a simulated radar target response by introducing a controlled time delay and amplitude limitation to said incoming signal.

The invention relates to a high-power dual-coupling detection amplitude limiting circuit, which belongs to the field of microwave amplitude limiters and comprises a pre-stage amplitude limiting circuit, an auxiliary detection network and a post-stage amplitude limiting circuit which are sequentially connected along a main signal path, and the auxiliary detection network is used for reducing the power input to the post-stage amplitude limiting circuit by coupling input power before the detector tube D1 of the pre-stage amplitude limiting circuit is not fully conducted, and assisting the conduction of the PIN tube in the pre-stage amplitude limiting circuit. According to the high-power dual-coupling detection amplitude limiting circuit, the auxiliary detection network is added on the basis of a traditional semi-active circuit structure, and excessive radio-frequency power leaked into the rear-stage amplitude limiting circuit is coupled out from a main signal path through the auxiliary detection network before a detector tube of the front-stage amplitude limiting circuit is not fully conducted; therefore, the input power of the PIN tube in the post-stage amplitude limiting circuit is reduced, and the PIN tube is not burnt down; and meanwhile, the part of power can be used for assisting the conduction of a PIN tube in preceding stage amplitude limiting.

The utility model relates to a laser receiving circuit for a laser communication system. The laser receiving circuit comprises a photodiode PD, a current mirror circuit, an operational amplifier module U1, a limiting amplifier module U2 and a voltage follower circuit, the photodiode PD, the current mirror circuit, the operational amplifier module U1 and the limiting amplifier module U2 are sequentially connected in series, and the voltage follower circuit is arranged at a third interface of the limiting amplifier module U2. The current mirror circuit provided by the utility model has the characteristics of high input impedance and low output impedance, and enhances the stability and consistency of current signals, thereby reducing the introduction of noise. And subsequent amplitude limiting amplification is carried out to ensure the high-frequency transmission quality of the signal. The utility model has the characteristics of high sensitivity, low noise, high signal amplification precision and the like, and is suitable for a high-speed optical communication system.

A delay circuit (10) comprises a receiver for an incoming signal (11), a limiting amplifier (12) configured to receive and process the incoming signal, a fixed delay line (14) configured to introduce a predetermined time delay into the signals upstream or downstream of the power control circuit. A radar target simulator system (10) using such a delay circuit can provide a simulated radar target response by introducing a controlled time delay and amplitude limit for the incoming signal.

The application relates to a trans-impedance amplifier integrated with automatic reset and fast burst response, which comprises a trans-impedance amplifier front-end circuit, a reset signal automatic generation circuit in communication with the trans-impedance amplifier front-end circuit and an adjustable low-pass filter circuit; the adjustable low-pass filter circuit is in communication with an output signal of the trans-impedance amplifier front-end circuit and in communication with reset signals RST and inverse reset signals RSTB generated by the reset signal automatic generation circuit; the adjustable low-pass filter circuit is used for controlling MOS variable resistors and MOS switches arranged in the adjustable low-pass filter circuit according to the reset signals RST and the inverse reset signals RSTB and forming a low-pass filter with adjustable cut-off frequency, and a signal output by the low-pass filter with adjustable cut-off frequency conforms to a mean interval of a voltage signal output by the trans-impedance amplifier front-end circuit. An external RESET signal provided by an MCU is no longer needed to complete fast burst response of chips such as a trans-impedance amplifier, a limiting amplifier and a CDR.

The present invention discloses a signal transmission circuit and electronic device based on multi-layer stripline. The signal transmission circuit includes: a multi-channel limiting amplifier circuit, a signal routing structure, and multiple combining switches. The signal routing structure includes multiple layers of stripline, each layer of stripline including multiple stripline transmission lines. The output end of the multi-channel limiting amplifier circuit is connected to the stripline transmission line, and signals transmitted simultaneously are transmitted through stripline transmission lines on different layers, while signals transmitted at different times are transmitted through stripline transmission lines on the same layer. Stripline transmission lines on the same layer are connected to one combining switch, while stripline transmission lines on different layers are connected to different combining switches. The present invention utilizes a multi-channel limiting amplifier circuit and multi-layer, multi-channel stripline transmission to achieve arbitrary routing between radio frequency channels. The invention also has high isolation and high integration, achieving planarization, dielectricization, and miniaturization of the radio frequency transmission network.

The invention discloses a 20 GHz large dynamic range logarithmic detector, and belongs to the field of broadband detectors. The 20GHz large dynamic range logarithmic detector comprises a limiting amplifier module, a rectifier module and an adder module. Wherein the limiting amplifier module is used for carrying out limiting amplification on an input signal; the rectifier module is used for converting an input signal of the limiting amplifier module into a detection current; and the adder module is used for gathering the detection current of the plurality of rectifier modules to a resistor and converting the detection current into voltage output. According to the invention, the wide-frequency-range input and large-dynamic-range output functions are realized, the wider signal transmission rate can be covered, the larger signal power range can be covered, and the strict requirements of high-integration-level, high-precision, high-sensitivity and large-dynamic-range receivers and other systems on the performance of the detector can be met.

The invention discloses a multimode optical fiber PON (Passive Optical Network) system and a multimode PON optical module. The multimode optical fiber PON system consists of a multimode OLT (Optical Line Terminal) optical module, a multimode main optical fiber, a multimode optical splitter, a multimode branch optical fiber and a multimode ONU (Optical Network Unit) optical module, according to the multimode OLT optical module and the multimode ONU optical module, a laser, a laser driver, a detector, a transimpedance amplifier, a limiting amplifier and the like are directly mounted on a printed circuit board by adopting a planar optical waveguide assembly and a COB (Chip On Board) mode, so that photoelectric hybrid integrated packaging is realized, and the miniaturization design of the optical module is realized; the planar optical waveguide assembly realizes multiplexing transmission of two wavelength multimode laser beams through a 45-degree reflecting surface and a 45-degree placed multimode light splitting sheet structure; the welding type pin row connector ensures reliable fixation of the optical mode electrical interface, and the clamping jaw structure and the optical fiber contact pin of the multimode optical fiber assembly realize the anti-vibration pluggable optical interface design. The multimode optical fiber PON system provided by the invention meets the requirement of the system for point-to-multipoint optical fiber transmission in a short-distance range with low power consumption, low cost and high reliability.

The invention provides an optical module and a forming method of the optical module. The optical module comprises a housing which is internally provided with an accommodating cavity; the circuit board is positioned in the accommodating cavity; the chip assembly is located in the containing cavity and coupled with the circuit board, the chip assembly comprises multiple sets of optical chip assemblies and multiple sets of electric chip assemblies, each set of optical chip assembly comprises at least one optical receiving chip and at least one optical transmitting chip, and each set of electric chip assembly comprises at least one driving chip and at least one limiting amplifier. Based on the technical scheme, the manufacturing cost of the optical module can be effectively reduced, the number of channels of the optical receiving chip, the optical transmitting chip, the driving chip and the limiting amplifier can be respectively set, and the use is more flexible.

An amplifier includes a gain stage having a gain stage input and a gain stage output and an impedance matching circuit connected to the gain stage output, the impedance matching circuit including an input and an output. The amplifier also includes a coupling circuit connected to the input of the impedance matching circuit and a shorting circuit connected to the output of the impedance matching circuit. The coupling circuit provides a voltage to the shorting circuit that causes the shorting circuit create a short to ground through a reflecting capacitor which causes a reflection to be provided to the output of the impedance matching circuit and that is transmitted to the coupling circuit to increase the voltage provided to the shorting circuit by the coupling circuit.

In the optical module provided by the invention, a first optical receiving part receives a fourth wavelength optical signal, a fifth wavelength optical signal and a sixth wavelength optical signal reflected by a first reflector, and outputs a first voltage signal, a second voltage signal or a third voltage signal; a golden finger, an MCU, a first limiting amplifier, a second limiting amplifier and a filter circuit are arranged on the circuit board; the input end of the first limiting amplifier and the input end of the second limiting amplifier are connected with a first light receiving part through a filter circuit; the filter circuit transmits a second voltage signal to the first limiting amplifier, so that the first limiting amplifier processes the second voltage signal and transmits the second voltage signal to the golden finger; and the MCU is in control connection with the second limiting amplifier, so that the second limiting amplifier processes the first voltage signal or the third voltage signal through the control signal and then transmits the first voltage signal or the third voltage signal to the golden finger through the corresponding output end.

The invention provides a pulse generation method and system, electronic equipment and a storage medium, and relates to the technical field of pulse generation, through a mode of combining a digital phase-locked loop and analog delay control, the pulse generation system realizes fine pulse width regulation and control while maintaining high frequency stability, and the pulse generation efficiency is improved. And the accuracy of digital logic and the flexibility of analog regulation and control are both considered. Moreover, a high-quality differential square wave signal is generated through an amplitude limiting amplifier, and then fine phase difference regulation and control are realized in combination with a time delay module, so that a target pulse signal with narrow pulse width, fast edge and accurate pulse width is generated. The digital phase-locked loop and the delay module are controlled by the controller, so that the pulse width can be flexibly adjusted, the pulse period can be controlled, and diversified requirements of different application scenes on pulse parameters can be met. The introduction of the feedback processing module can provide real-time monitoring and correction functions for the controller, and effectively counteracts the influence caused by environment change and drift of each component in the pulse generation system.

The present application provides a terahertz high-speed transceiver component and electronic equipment, which transmits and receives terahertz signals through an antenna, realizes modulation and demodulation of terahertz signals through a terahertz transceiver circuit, and improves the quality of the baseband signal through a continuous-time linear equalization circuit, a clock data recovery circuit, a driving circuit, and a limiting amplifier, so that the terahertz high-speed transceiver component can realize high-quality high-speed signal transmission at a low cost and meet the transmission distance requirements.

The training control method and optical module provided in this application include: querying whether the training status control command flag is a first preset command value; if it is the first preset command value, then causing the laser driver to transmit a second electrical signal sent by the host computer to a limiting amplifier, so that the limiting amplifier transmits the electrical signal back to the host computer via a gold finger, wherein the host computer is the host computer to which the optical module is connected. When the training status control command flag in the optical module is the first preset command value, the training control method and optical module provided in this application control the optical module to enter training mode, causing the laser driver to transmit an electrical signal to a limiting amplifier, and then transmitting the electrical signal back to the host computer via a gold finger. This effectively reduces jitter accumulation during electro-optical conversion and transmission, and assists in accurately assessing the degradation of electrical signals from each port on the system board to the MAC chip.

The application provides a low-cost design scheme suitable for common-mode recovery of burst-mode limiting amplifier. The method of variable time constant can shorten the common-mode recovery time to 14 ns, meeting the requirements of passive optical network. The design is simple and feasible, which not only retains the advantages of simple design of alternating current coupling of front and rear stages, but also avoids the long common-mode recovery time caused by alternating current coupling in the burst-mode limiting amplifier, which is difficult to meet the index requirements of the loop working speed better than 25.6 ns in the burst-mode limiting amplifier.

The invention relates to a broadband logarithmic detector. The amplitude limiting amplifier comprises an amplitude limiting amplifier link used for carrying out amplitude limiting amplification on a signal to be detected, amplitude limiting amplification gains comprise a first amplitude limiting amplification gain or a second amplitude limiting amplification gain, and the numerical value of the first amplitude limiting amplification gain is larger than that of the second amplitude limiting amplification gain, when the amplitude limiting amplification gain of the amplitude limiting amplifier link is the first amplitude limiting amplification gain, the amplitude limiting amplifiers of the first stage are connected, and each amplitude limiting amplifier provides a single-stage first amplification gain; when the amplitude-limiting amplification gain of the amplitude-limiting amplifier link is a second amplitude-limiting amplification gain, accessing a second-stage amplitude-limiting amplifier, and providing a single-stage second amplification gain by each amplitude-limiting amplifier; the first stage number is smaller than the second stage number, and the single-stage first amplification gain is larger than the single-stage second amplification gain. According to the method, translation of the RSSI output characteristic curve of the logarithmic detector can be effectively stabilized, and the output characteristic and the process robustness of the logarithmic detector are improved.

This application discloses a dual-polarization radio frequency transceiver system and its package structure, including: a power amplifier chip, a limiting amplifier chip, a circulator, a switching chip, a first microstrip filter stub, and a second microstrip filter stub. In the transmit state, the circulator is used to unidirectionally transmit the radio frequency signal input to the power amplifier chip to the switching chip. The switching chip can switch the transmission path of the radio frequency signal so that the radio frequency signal is processed by the first microstrip filter stub or the second microstrip filter stub before being output. In the receive state, the circulator is used to unidirectionally transmit the radio frequency signal input to the first microstrip filter stub or the second microstrip filter stub after passing through the switching chip to the limiting amplifier chip before being output. This invention realizes the switching between horizontal and vertical polarization channels through the switching chip, and improves the second harmonic suppression ratio by utilizing the first and second microstrip filter stubs. The system is integrated into a miniaturized package structure and has good heat dissipation.

The optical module provided by the utility model comprises a circuit board which is provided with a limiting amplifier and a reset signal generation circuit; the light receiving component comprises a photoelectric detector and a trans-impedance amplifier, the photoelectric detector is used for receiving burst light receiving signals, the input end of the trans-impedance amplifier is electrically connected with the photoelectric detector, and the output end of the trans-impedance amplifier is electrically connected with the limiting amplifier; the reset signal generation circuit comprises: a time delay sub-circuit, the input end of which is used for inputting a detection signal and performing time delay processing on the detection signal; the exclusive-OR gate comprises a first input end and a second input end; the first input end is used for inputting a detection signal, and the second input end is connected with the output end of the delay sub-circuit; the output end of the exclusive-OR gate is connected with the reset input end of the transimpedance amplifier, and the exclusive-OR gate outputs a first reset signal based on a detection signal and a delayed detection signal, so that the transimpedance amplifier is reset based on the first reset signal. And rapid resetting of the transimpedance amplifier is facilitated.

The utility model belongs to the technical field of microphones, and particularly relates to a Bluetooth microphone improvement circuit and a Bluetooth microphone, the Bluetooth microphone improvement circuit comprises a Bluetooth audio processing chip and an amplitude limiting circuit, the Bluetooth audio processing chip is connected with the amplitude limiting circuit, the amplitude limiting circuit is also connected with an electret MIC, and the Bluetooth audio processing chip is also connected with a Bluetooth antenna. By adding the amplitude limiting circuit, the signal amplitude of the Bluetooth audio processing chip is limited, signal overload is avoided, and tone quality distortion and noise are prevented.

Systems and techniques for improved error correction for high-speed optical networks are described herein. An optical signal is received and the optical signal is converted into an electrical signal. The electrical signal is amplified through a trans-impedance amplifier to produce an amplified signal. The amplified signal is normalized using a limit amplifier to generate a normalized signal. Bit values are determined from the normalized signal and a corresponding probability bit is generated for each bit value using a threshold detector. The bit values and the corresponding probability bit are encoded into a four-level pulse-amplitude modulation (PAM-4) signal. The PAM-4 signal is transmitted to an application-specific integrated circuit (ASIC) for data recovery and error correction processing.

The utility model provides a 10-gigabit optical receiving circuit, which comprises a photodiode, a trans-impedance amplifier, a differential amplifier and a limiting amplifier, the photodiode is connected in series between the two input ends of the transimpedance amplifier; the resistor R1 is connected in series between the first input end of the differential amplifier and the first output end of the trans-impedance amplifier, and the capacitor C3 is connected in parallel with the resistor R1; the resistor R2 is connected in series between the second input end of the differential amplifier and the second output end of the trans-impedance amplifier, and the capacitor C4 is connected in parallel with the resistor R2; the resistor R3 is connected in series between the first input end of the differential amplifier and the first output end of the differential amplifier, and the resistor R4 is connected in series between the second input end of the differential amplifier and the second output end of the differential amplifier; the output end of the differential amplifier is sequentially connected with the limiting amplifier and the input end of the signal processing module. Therefore, according to the utility model, the high-frequency response is enhanced, and the influence of noise is reduced.

The present application relates to a kind of wideband log detector.It includes the limiting amplifier link for the limiting amplification of signal to be detected, the limiting amplification gain includes first limiting amplification gain or second limiting amplification gain, the value of first limiting amplification gain is greater than the value of second limiting amplification gain, wherein, when the limiting amplification gain of limiting amplifier link is first limiting amplification gain, access the limiting amplifier of first stage number, and each limiting amplifier provides single-stage first amplification gain;When the limiting amplification gain of limiting amplifier link is second limiting amplification gain, access the limiting amplifier of second stage number, and each limiting amplifier provides single-stage second amplification gain;First stage number is less than second stage number, and single-stage first amplification gain is greater than single-stage second amplification gain.The present application can effectively stabilize the translation of the RSSI output characteristic curve of log detector, improve the output characteristic and process robustness of log detector.

The utility model discloses an OLT equipment based on optical module standard package adopts standard SFP+ / XFP package shell, contain: SC / LC optical interface connection TO package's 1577nm electric absorption modulation laser, 1490nm distributed feedback laser and integrated TIA's 10G / 1.25G APD detector, laser drive unit contains input buffer and pre -drive circuit, burst receiving unit contains burst across resistance amplifier and limiting amplifier circuit, contain the XGSPON / XGPON / GPON MAC processing and management chip of meeting ITU-T G.9807.1, ITU-T G.987.1 and ITU-T G.984.x protocol specification through high -speed SerDes link connection support XGMII / HSGMII / SGMII interface's ethernet switch chip, and the equipment control unit integrates SFP+ / XFP management interface, and the golden finger interface circuit is directly connected switch chip through circuit board transmission line, and each unit is connected through optical fiber channel, circuit wiring and control bus, realizes OLT function modularization integration, reduces the deployment cost and power consumption.

The invention discloses a dual-channel and miniaturized optical module driving circuit and a dual-channel optical module, and relates to the technical field of optical modules.The dual-channel optical module comprises a first channel and a second channel; each of the first channel and the second channel comprises a laser diode, a limiting amplifier, an electro-absorption modulated laser and an avalanche photodiode; the optical module driving circuit comprises an interface unit, a control unit and a driving unit. The interface unit is connected with the control unit, and the control unit is connected with the driving unit; and the driving unit is respectively connected with the laser diodes, the limiting amplifiers, the electro-absorption modulated lasers and the avalanche photodiodes of the first channel and the second channel. According to the dual-channel parallel processing mechanism, synchronous receiving and transmitting of bidirectional data are achieved through an independent signal path, and the bandwidth limitation of a traditional single-channel architecture is broken through. Meanwhile, due to the centralized control of the two channels, the integration level is remarkably improved, and the overall size of the equipment is reduced.

Systems and techniques for are described herein. An optical signal is received and the optical signal is converted into an electrical signal. The electrical signal is amplified through a trans-impedance amplifier to produce an amplified signal. The amplified signal is normalized using a limit amplifier to generate a normalized signal. Bit values are determined from the normalized signal and a corresponding probability bit is generated for each bit value using a threshold detector. The bit values and the corresponding probability bit are encoded into a four-level pulse-amplitude modulation (PAM-4) signal. The PAM-4 signal is transmitted to an application-specific integrated circuit (ASIC) for data recovery and error correction processing.