PURPOSE: To obtain a polar type leapfrog filter in which a semiconductor integrated circuit processing is attained by using two integration devices each comprising a capacitor and a variable conductance amplifier for components and selecting total number of all circuits is an odd number equal to number of degrees of the filter.
CONSTITUTION: Circuits 21, 23 each comprising integration circuits 12,13 correspond to polar circuits. Furthermore, variable conductance amplifiers G1, Gi, Gn are integration circuits in which capacitors c1, ci, cn are connected to output terminals. Only the amplifier G1 is formed to be a self negative feedback type. Furthermore, negative feedback is applied in a leapfrog form to a pre-stage circuit such as from an integration device 24 to a polar circuit network 23, from an integration device 22 to a polar circuit network 22, from an integration device 21 to the input side integration device 20 respectively. Moreover, the sum of number of integration devices and organic circuit networks is an odd number and equal to the number of degrees of the filter, and the combination of the circuit network 21 and the integration device 22 connected in dot lines is added in series to form the high-degree polar leapfrog filter.
KONDO HIROSHI
TOYAMA TSUNEO
FUKAI ISAO
| JP2333136A |