35results about How to "Bandwidth unchanged" patented technology

The invention discloses a high-voltage amplifier based on wireless data transmission isolation, and a control method thereof. The high-voltage amplifier comprises a main control processing unit and a plurality of auxiliary amplifier units; the main control processing unit comprises a main single-chip microcomputer, a main radio-frequency data transceiving module and a main power supply module; the main radio-frequency data transceiving module and the main power supply module are connected to the main single-chip microcomputer; the auxiliary amplifier units each comprise a slave radio-frequency data transceiving module, a signal conditioning and acquiring module, a slave single-chip microcomputer, a DDS waveform synthesis module, a filter module, a relay module, a same-phase / reverse-phase amplifier module and a slave power supply module; the slave radio-frequency data transceiving module, the signal conditioning and acquiring module, the relay module and the slave power supply module are connected with the slave single-chip microcomputer; and the slave single-chip microcomputer, the DDS waveform synthesis module, the filter module, the relay module and the same-phase / reverse-phase amplifier module are sequentially connected. By means of the high-voltage amplifier based on wireless data transmission isolation, and the control method thereof disclosed by the invention, the problem that the isolation voltage of an isolation amplifier is too low can be solved; and simultaneously, the amplifier waveform distortion problem based on the isolation amplifier or an optical coupler can be solved.

The invention belongs to the technical field of radar, and discloses a quadrature wide main lobe phase coded signal and mismatched filter joint optimization method, which can reduce autocorrelation peak side lobe level and peak cross-correlation level after quadrature wide main lobe phase coded signals are subjected to pulse compression through the mismatched filters. The method comprises steps: the number of sub phase coded signals in the quadrature wide main lobe phase coded signals and the symbol length of each sub phase coded signal are determined; the length of each sub mismatched filter in the mismatched filter group is determined, and the main lobe width control quantity after each sub phase coded signal passes through the corresponding sub mismatched filter is determined; according to the quadrature wide main lobe phase coded signals, the mismatched filters and the main lobe width control quantity, an objective function for the quadrature wide main lobe phase coded signals and the mismatched filters is built; and the objective function is solved, and the quadrature wide main lobe phase coded signals after optimization and the mismatched filters after optimization are obtained.

The invention discloses a TIA overload current correction method and circuit used in an optical receiver in the technical field of optical communication. The steps of the method include: obtaining two AC voltage signals output by the pseudo-differential transimpedance amplifier circuit; obtaining the current overload signal value through the output two AC voltage signals; comparing the current overload signal value with a preset reference voltage value, and when When the value of the current overload signal is greater than the preset reference voltage value, the current part of one input terminal of the pseudo-differential transimpedance amplifier circuit is shunted to the other input terminal. The beneficial effect of the present invention is that in high-speed circuits and systems, the pseudo-differential TIA AC current is shunted to the virtual GND point instead of the physical GND point, reducing the components in the circuit and reducing the difficulty of circuit component layout; The stability of the TIA is maintained, and the bandwidth of the TIA remains unchanged; from the perspective of virtual GND, the parallel capacitance of the MOS device is halved, thereby reducing the parasitic capacitance.

The invention discloses a radio frequency optical comb instrument with independently adjustable bandwidth and frequency, which is suitable for the field of radio frequency photons. The radio frequencyoptical comb instrument includes: a light intensity modulator (2), a radio frequency signal generator (3), first and second 2*2 optical couplers (31) and (32), an erbium-doped fiber amplifier (4), first and second distributed feedback Bragg lasers (51) and (52), first and second optical isolators (61) and (62), first and second semiconductor optical amplifiers (71) and (72), first and second optical circulators (81) and (82), first and second fiber gratings (91) and (92), a single-mode fiber (11), a third optical isolator (63) and a photoelectric detector (13).