4 results about "Simple circuit" patented technology

The invention provides a radio frequency digitized modulation method based on DDS and DSP. The method comprises a step of transmitting digital singals obtained by an A/D converter to the DSP. The DSP calculates instantaneous frequency offset of the DDS according to the maximum sampling value and digital signal instantaneous value which are output by the A/D converter and calculates instantaneous frequency control word of the DDS according to bits, clock frequency and radio frequency carrier frequency of the DDS. The DDS carries out frequency modulation on the radio-frequency signals according to the instantaneous frequency control word, and generates frequency-modulated signals. The method realizes complete digitized radio frequency modulation. Compared with an analogue modulation method, the radio frequency digitized modulation method has simple circuits, good consistency and high reliability, and is particularly suitable for high speed frequency-hopping sending channels such as high speed frequency-hopping broadcasting station, short frequency conversion time and high data transmission rate.

The invention relates to a server CMC redundancy test circuit and a method thereof. The server CMC redundancy test circuit comprises: a testing circuit for obtaining case management controller state information; a control circuit for controlling power supply state of chassis management controller; a processor that issues control commands to a control circuit through state information, and the control circuit and the detection circuit are both connected to the processor. The invention realizes a test environment in which a chassis management controller in a simulation server fails, and carriesout redundancy test on the chassis management controller in the server to simulate the failure. The invention needs no manual operation, has a simple circuit, low cost of electric components, saves manpower and cost, and improves the accuracy of testing.