Design of a Low Current Leakage Integrator for Non-Coherent Ultra-WideBand Receiver
Abstract: Non-coherent receiver architecture is preferred more than coherent receiver architecture in many applications due to its lower complexity (hence lower cost) and lower energy consumption even though it may have shorter communication range. Even it has a lower complexity, it is still problem to utilize energy without sacrificing performance of the system. Integrator is a key block of non-coherent receiver architecture, needs to be designed for minimum power consumption and minimum distortion. Current leakage is one of the most important distortion type of integrator, needs to be taken under control. In this thesis work, three different Gm-C based integrator has been designed to identify effects of different performance paremeters of OTA on the current leakage. Three different cascode/telescopic based OTA are implemented in circuit level using a 90nm CMOS technology and Cadence tools. Furthermore, both system level and circuit level simulations are given and compared. Improved Telescopic OTA and Regulated Cascode OTA are implemented which have 15.71MHz and 2.23MHz cutoff frequencies respectively, aginst the Conventional Telescopic OTA that has 3.166 MHz cut off frequency. Both Improved and Regulated OTA has lower current leakage %4.38 and %6.93 at 150MHz input signal than Conventional Telescopic OTA that has %7.70 current leakage during discharging.
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