OTA topologies for active RC filters with GHz band

The modern communication systems are required to provide high data rate. in order to achieve this goal, the modern standards are modified by enlarging the channel bandwidths, or by exploiting multiple operating band, or by transmitting and receive through different antennas placed on the same device (MIMO). These changes complicate the design of the transceiver and pose very stringent requirements on them, in particular on the receiver. In traditional receiver chain were used RF filter to attenuate the undesired out-of-band signals. These filters are bulky, increase the cost of the chip and increase the complexity of the system. For these reasons during last years it becomes highly desirable to design a single wide-band receiver capable of working on several bands. From the Receiver (RX) point of view, this imposes strong linearity requirements, posing important design challenges in the base-band (BB) portion of the RX. In particular, base band filters are required to handle strong un-filtered out-of-band signals without degrading SNR. The purpose of this work is the design of TIA, which preform a channel select filtering in the base band section for 5G-oriented transceiver. The design of TIA is based on Operational Amplifier with parallel R-C feedback. The design is optimized to get stability and achieve high loop gain over an extended bandwidth, in order to guarantee the linearity.

Topologie OTA per filtri attivi RC con banda fino a un GHz