Digital PVT calibration of a Frequency-to-Voltage converter

A digital process, voltage, and temperature (PVT) calibration loop for a Frequency-to-Voltage converter (FVC) is presented. The FVC needs a precisely controlled delay element, but delay in CMOS is highly dependent on the PVT condition making it neccessary to calibrate the delay line. The system is d...

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Hauptverfasser: Michaelsen, Jorgen Andreas, Wisland, Dag T.
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description A digital process, voltage, and temperature (PVT) calibration loop for a Frequency-to-Voltage converter (FVC) is presented. The FVC needs a precisely controlled delay element, but delay in CMOS is highly dependent on the PVT condition making it neccessary to calibrate the delay line. The system is designed to calibrate against an external reference frequency which is already present in the intended application. This is advantageous, as it is not neccesary to generate additional bandgap or other reference on chip. Results from transistor level simulations using a 90 nm CMOS process are presented, showing good regulation accross PVT corners and ability to track changes in the PVT condition. The calibration loop is digital and therefore a good fit for CMOS technology.
doi_str_mv 10.1109/NORCHIP.2010.5669455
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subjects Capacitance
CMOS integrated circuits
CMOS technology
Gain
Impedance
Low power electronics
Semiconductor device measurement
title Digital PVT calibration of a Frequency-to-Voltage converter
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