NOISE REJECTION DEVICE FOR BROAD-BAND SIGNAL RECEIVER Russian patent published in 1998 - IPC

FIELD: radio engineering; broad-band signal communication systems. SUBSTANCE: device has series-connected first subtractor 1, decoupling unit 14, third subtractor 13, first multiplier 2, first band filter 3, phase shifter 4, second multiplier 5, second subtractor 6, attenuator 7 whose output is connected to other input of first subtractor 1. Inputs of subtractors 1 and 6 are combined and function as input of device as a whole. Common point of output of second subtractor 6 and of input of attenuator 7 is connected through series-connected variable- gain unit 12 and switch 16 to other input of third subtractor 13. Common point of output of first multiplier 2 and of input of first band filter 3 is connected through series-connected second band filter 8, amplifier 9, AGC detector 10 to other input of variable-gain unit 12. Common point of output of first band filter 3 and of input of phase shifter 4 is connected through computing circuit 15 to other input of switch 16. Output of signal copy generator 11 is connected to other inputs of multipliers 2 and 5. Common point of output of third subtractor 13 and of input of first multiplier 2 functions as device output. EFFECT: improved design. 1 dwg