The angle demodulator ( ADM) is a key component for the path matched differential interferometry (PMDI) sensors. Conventional ADMs require tens of operational amplifiers (OPAMPs) and bulky capacitors and resistors, making them difficult to be realized as integrated circuits (ICs). This paper presents the first ADM IC design that requires only one OPAMP and thus saves significant area and power. In addition, this novel ADM design tolerates a wide range of modulation depth of the optical interferometer of the PMDI sensors. As a result, the yield of the PMDI sensor significantly increases. A test chip has been designed and successfully verified in O.18-μm CMOS. The active area of the proposed circuits is only 476 by 368 μm2 and it consumes only 6.26 mW.
|Number of pages||4|
|Journal||Proceedings of IEEE Sensors|
|State||Published - 12 Dec 2014|
|Event||13th IEEE SENSORS Conference, SENSORS 2014 - Valencia, Spain|
Duration: 2 Nov 2014 → 5 Nov 2014