A Design of TRX dual mode Baseband Analog with Dynamic Range and DC offset controller for applying NB-IoT

This paper presents a design of a TRX dual mode and high dynamic range Baseband Analog for applying NB-IoT (Narrow Band Internet of Things). The primary focus of this design is achieving a large dynamic range of 70dB, which is important for maintaining signal integrity and accuracy in NB-IoT systems. The BBA architecture includes TRX mode filters, Variable Gain Amplifiers (VGA), and DC Offset Cancellers (DCOC). These components work together to provide the necessary signal conditioning and processing for the baseband signals in the NB-IoT system. The TRX dual-mode filters are designed to operate as Complex Band Pass Filters (BPF) in RX path and Low Pass Filters (LPF) in TX path. The Variable Gain Amplifiers (VGA) provide tunable gain control, allowing the system to adapt to different signal levels. This flexibility is crucial for maintaining the dynamic range and ensuring accurate signal processing. Additionally, the DC Offset Cancellers (DCOC) help to remove any DC offset present in the baseband signals, improving the overall performance and signal integrity. Also, special technique was added to remove offset by adjusting DC level of signal.