A 2.4GHz low power wireless transceiver analog front-end for endoscopy capsule system

This work presents the design and implementation of a 2.4GHz low power wireless transceiver analog front-end for the endoscopy capsule system in 0.25um CMOS process. The prototype integrates a low-IF receiver analog front-end (low noise amplifier, double balanced down-converter, band-pass filtered AGC loop and ASK detector) and a direct up-conversion transmitter analog front-end (20MHz IF PLL with well defined amplitude control circuit, ASK modulator, up-converter and output buffer) on a single chip together with an internal RF local oscillator and LO buffers. Design trade-offs have been made over the boundaries of the different building blocks to optimize the overall system performance. All building blocks feature circuit topologies that enable comfortable operation at low power consumption. As a result, the IC operates from a power supply of 2.5 V, while only consuming 15mW in receiver (RX) mode and 14mW in transmitter (TX) mode.