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A low power oscillator based TDC with in-system non-linearity correction

: Voelker, M.; Hauer, J.


IEEE Circuits and Systems Society:
IEEE International Symposium on Circuits and Systems, ISCAS 2012 : Seoul, South Korea, 20 - 23 May 2012
Piscataway: IEEE, 2012
ISBN: 978-1-4673-0219-7 (electronic)
ISBN: 978-1-4673-0218-0
S.1046-1049 (Vol.2)
International Symposium on Circuits and Systems (ISCAS) <2012, Seoul>
Fraunhofer IIS ()

A time to digital converter for positron emission tomography readout circuits is presented. The converter is based on a ring oscillator and is optimized for low power consumption down to 36 W at low event rates. Non-linearities caused by the oscillator startup are corrected in the digital domain. The proposed correction scheme is able to estimate the non-linearities of the converter without additional analog circuitry. A resolution of 15.08 ENOB using a 10 MHz reference clock is achieved. The circuit is implemented in a 180 nm CMOS technology occupying only 0.0077 mm 2.