BROADBAND MULTICHANNEL PIEZOELECTRIC FILTERING DEVICE Russian patent published in 2007 - IPC H03H7/01 H03H11/12 

FIELD: radio electronics; signal processing radio receivers and instrumentation engineering.

SUBSTANCE: proposed filtering device of "1 input-N + 1 outputs" multichannel design has algebraic adder built around operational amplifier 1 provided with resistive negative feedback 2 and resistors 3. 4 connected to its inverting and noninverting inputs, resistor 5 connected between input of operational amplifier 1 and common line, piezoelectric resonators 6, 7 whose first leads are connected to input potential terminal of device and second ones, to inverting inputs of operational amplifiers 10, 11 through resistors 8, 9 with resistive negative feedbacks 12, 13 applied to each of them; outputs of operational amplifiers 10, 11 are connected to second leads of resistors 3, 4, respectively. Newly introduced is oscillatory circuit 14 set up of series-connected LC elements 15, 16 which is connected to output of operational amplifier 1, second lead of LC circuit being connected to output potential terminal of device and through resistor 17, to common bus.

EFFECT: extended passband of proposed multichannel filtering device.

2 cl, 2 dwg