Abstruct-Generation of two integer loop filter structures using operational Transconductance Amplifiers (OTA's) and Capicitors (TAC) is presented. A direct block diagram approach is employed to generate the TAC filter structures. The basic filter building blocks consist of a lossless integrator, lossy integrators and three types of summers. They are implemented using OTA's as the active components. The resulting TAC second-order filter structures, some previously reported and other new structures, are orderly generated. It is shown that the selection of the best structure depends upon the particular application or design specifications. The generated TAC biquadratic structures are very suitable for monolithic filters since typically only OTA's and two capacitors are needed. A TAC filter structure homologous to the conventional KHN op amp filter structure is presented. Programmability of op,Qp and voltage gain is considered. B m r This implies that a unity weight factor' is obtained be-'For the injection of signal V, it is assumed an ideal voltage source.

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