Super-regenerative receiver at 433 MHz

This paper presents a receiver for operation in the 433 MHz ISM band. The selected architecture explores the super-regeneration phenomena to achieve a high sensitivity for applying in wireless implantable microsystems. This radio-frequency (RF) chip can be supplied with a voltage of only 3 V for demodulating signals with powers in the range (−100, −40) dB. The codulation (modulation and coding) scheme of the binary data is a variation of the Manchester code combined with on/off keying (OOK) modulation. The AMIS 0.7 μm CMOS process was selected for targeting the requirement to fabricate a low-cost receiver, whose prototype was integrated in a die with an area of 5×5 mm2. Also, this receiver is fully compatible with commercial transmitters for the same frequency.