Radiation hardened by design CMOS crystal oscillator for readout telemetry
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United States of America Patent
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Oct 18, 2022
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N/A
app pub date -
Nov 22, 2021
filing date -
Nov 22, 2021
priority date (Note) -
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Abstract
A clock source includes a comparator having a positive comparator input, a negative comparator input, a proportional to absolute temperature (PTAT) PMOS bias input, a PTAT NMOS bias input, and a comparator output, a resonator element, series and feedback resistors and other passive components coupled between the comparator output and the negative comparator input to generate a signal with approximately constant gain and frequency at the comparator output, and a PTAT bias circuit coupled to the comparator's PTAT PMOS and NMOS bias inputs, and configured to drive the PTAT PMOS bias input and the PTAT NMOS bias input to maintain approximately constant gain and frequency over the operating temperature range of the clock source.
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