|Dimensions||1200μm x 800μm|
The goal of this project is the development of a receiver for digital modulation that is working in the ISM band between 174 and 223 MHz and that is suited for biomedical applications with demand for high data rates. Common requirements in such applications are normally low power and small physical size.
The receiver plan was developed in a previous study. The specifications of the IF-amplifier emerged as a part of it.
The amplifier is a three-stage design that works at an intermediate frequency (IF) of 10.7 MHz. Its gain varies between 0 and 42 dB in 6 dB steps, with 0 to 18 dB in the first stage and 0 to 12 dB in the second and third stage. The noise figure is 15 dB at a source impedance of 600 Ohm it has an IP3 of 81 dBuV, a 1 dB compression point of 68 dBuV and a bandwidth of 30 MHz while consuming 126uA.
The design is fully differential with a single-ended to differential conversion at the input of the first stage converting the signal of the external single-ended channel selection filter. The gain is digitally chosen via a three to eight decoder.
The chip is being fabricated in a 0.8um BiCMOS technology and works at a supply voltage down to 2 V. Its size is 1200um x 800um.