The invention provides an AGC (automatic gain control) control circuit for a management type household optical receiving machine. The AGC control circuit is used for the management type household optical receiving machine. The receiving machine comprises a photoelectric conversion circuit and a numerically controlled attenuator, the control circuit comprises an optical power detection circuit, a MCU (micro control unit) and an AGC signal transmission circuit, the input end of the optical power detection circuit is connected with the photoelectric conversion circuit, the output end of the optical power detection circuit is connected with an optical power signal input port of the MCU, the AGC control signal output end of the MCU is connected with the AGC control end of the numerically controlled attenuator through the AGC signal transmission circuit. The AGC control circuit has the advantages that the structure is simple, the manufacturing cost is low, the ripple waves of transmitted MCU signals can be lower, and the output DAC response degree is higher. After the AGC control circuit is used, the input optical power range of the optical receiving machine is wider, and a higher output level is realized.

AGC (automatic gain control) control circuit for management type household optical receiving machine

The invention discloses an information receiving device based on a photosensitive tube. The information receiving device based on the photosensitive tube comprises a shell, a visible light information receiving circuit is arranged inside the shell, and the visible light information receiving circuit comprises a phototriode, an amplification filter circuit and a single chip microcomputer which is connected with a clock circuit. According to the information receiving device based on the photosensitive tube, the phototriode is used for receiving LED lamplight which is generated by the way of driving of lighting equipment with an information transmission function through modulating signals of different frequencies, the signals generated by the phototriode are used for controlling an amplification triode to be connected or disconnected, and signal input is achieved through the high-low level generated by the amplification triode in an input pin of a counter of the single chip microcomputer in the connecting and disconnecting process; then, the single chip microcomputer which is connected with the clock circuit and has the function of the counter is adopted, the signal frequencies received by the input pin of the counter are calculated in a fixed cycle, the different signal frequencies are made to correspond to the encoding code values of '0' and '1' of an ASCII respectively, transmission information is obtained ultimately, and automatic identification and storage can be carried out.

Information receiving device based on photosensitive tube and information receiving method thereof

The invention discloses a light control automatic gain circuit and an algorithm of control voltage, wherein the circuit comprises a photoelectric detection circuit, an operation amplifying circuit, a group of operation amplifying circuits, a group of diodes and a controllable attenuation module; radio frequency automatic gain control (AGC) in a 10 dB optical power variation range is achieved by a group of operation amplifiers, the control accuracy is in +/- 1 dB, so that the design need of an optical receiver is met Compared with a single-chip microcomputer circuit, the circuit has the advantages of low price, stability, reliability and no disturbance to radio frequency circuit; the control voltage algorithm is Vcon=(a-b*m)-20*b*Log(k*V1)

Light control automatic gain circuit and algorithm of control voltage

The invention discloses a signal processing system for pulse navigation radar. The system comprises a first electrically-controlled attenuator, a first amplifying filter unit, a second electrically-controlled attenuator, a second amplifying filter unit, a detector, an A/D converter, an FPGA with a gain controller integrated thereto, and an D/A converter. The first electrically-controlled attenuator, the first amplifying filter unit, the second electrically-controlled attenuator and the second amplifying filter unit are connected in sequence. The input end of the detector is connected with the second amplifying filter unit. The output end of the detector is connected with the A/D converter. The A/D converter is connected with the FPGA which is connected with the D/A converter. The D/A converter is connected with both the first electrically-controlled attenuator and the second electrically-controlled attenuator. The signal processing system is available for real-time precise smooth regulation of radar signals.

Signal processing system for pulse navigation radar

The invention provides a digital television transmitter broadband detection implementation system and method, and relates to a broadcasting transmission field. The digital television transmitter broadband detection implementation system comprises a radio-frequency digital-control attenuator, a radio frequency power detector, an operational amplifier, an analog-to-digital converter, a micro-processor and a micro-controller, wherein the micro-processor is connected with the micro-controller through a parallel data line or 12C bus in an FPGA mode, thereby obtaining calibration data; the micro-controller transmits data in an RS458 multi-computer communication or broadcasting mode. According to the digital television transmitter broadband detection implementation system and method, in a hardware and software combination mode, accuracy of broadband detection can be largely improved, errors of the broadband detection are reduced, and finally an excellent effect of transmitter control stability is implemented.

Digital television transmitter broadband detection implementation system and method

The utility model discloses an automatic gain control circuit with a digital signal compensation function. The automatic gain control circuit comprises one or more controllable attenuation modules, a radio frequency branch and detection circuit, an analog-to-digital (AD) converter, a control algorithm module, a digital-to-analog (DA) converter and a digital signal compensation algorithm module. A radio frequency output signal is sampled through the radio frequency branch and detection circuit, is subjected to AD conversion and is sent into the control algorithm module, a control algorithm is added with a digital signal compensation value and then calculates obtained control output, the obtained control output is subjected to DA conversion, and a controllable attenuator is controlled, so that the automatic gain control with the digital signal compensation function is realized, and the error of the automatic gain control which is caused by a detection difference value of an analog/digital signal is avoided.

Automatic gain control circuit with digital signal compensation function

The utility model discloses a light-operated automatic gain control circuit and an algorithm of control voltage. The circuit comprises a photoelectric detecting circuit, an operational amplifier circuit, a group of operational amplifier circuits, a group of diodes and a controllable attenuation module, wherein the radio frequency automatic gain control (AGC) within a variation range of 10dB light power is achieved through a group of operational amplifiers, the control accuracy is within a range between -1dB and +1dB, and the design requirement of a photoreceiver is met. Compared with a single chip microcomputer circuit, the light-operated automatic gain control circuit has the advantages of being low in price, stable and reliable and can not cause interference for radio frequency loops.

Light-operated automatic gain control circuit

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Light control automatic gain circuit and algorithm of control voltage

Automatic gain control circuit with digital signal compensation function

Light-operated automatic gain control circuit