Low-Power Ultra-Wideband Low Noise Amplifier Employing Forward Body Bias and Current-Reuse for Wireless Sensor Networks Applications

Chandrasekhar Kandagatla , Dr. Prabhu G. Benakop

Wireless, sensor nodes, Receiver

Wireless communication is a critical necessity for biomedical applications, and it has recently sparked a lot of research attention. Low-power receivers are required for such applications, while nevertheless allowing for acceptable communication range and coexistence with other receivers operating in the same frequency band. In wireless sensor network nodes, RF modules account for the majority of power usage. The basis of an RF module is a transceiver. Several methods for lowering the receiver's power consumption have lately been published. The RF local oscillator and RF low noise amplifiers, for example, are the most power-hungry blocks in the whole circuit. The RX power can be greatly decreased to the nanowatt level by using an all-passive RF front-end. We propose to use two stage CS amplifier with a Forward Body Bias (FBB) technique in order to reduce the threshold voltage of MOSFET, and hence, lowering the DC power. We use this method along with the CS–CD current reuse approach. The circuit has two stages: a common-source topology to compensate for the gain of the first stage (M2), and a source-follower (common-drain) topology as a buffer stage to avoid adding a third stage (M3) and improve output return loss. Using this proposed combination approach, we were able to achieve a considerable improvement in the frequency range of 2–11 GHz, according to our experimental results. In a wide frequency range, from 4 to 10 GHz, this improvement includes a lowest noise figure of 2.5 dB, a maximum noise figure of 4.2 dB, and an average noise figure of less than 3 db.

Volume 6 Issue 9, September-2021

Pages : 137 - 150