| Autor: |
Aaron Partridge, Vinod Menon, Jim Salvia, Kofi A. A. Makinwa, Samira Zaliasl, Terri S. Fiez |
| Rok vydání: |
2016 |
| Předmět: |
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| Zdroj: |
Efficient Sensor Interfaces, Advanced Amplifiers and Low Power RF Systems ISBN: 9783319211848 |
| DOI: |
10.1007/978-3-319-21185-5_4 |
| Popis: |
This paper describes the design of a low-power energy-efficient temperature-to-digital converter (TDC) intended for the temperature compensation of a 32 kHz MEMS-based oscillator (TCXO). The compensation scheme enables a frequency stability of ±3 ppm over temperatures ranging from −40 to 85 °C. The TDC consists of an NPN-based temperature sensing element and a 15-bit second order ΔΣ modulator. A novel dynamic element matching (DEM) scheme ensures that DEM tones do not inter-modulate with the modulator’s bit-stream, thus improving the TDC’s accuracy without impacting its resolution. The TDC occupies 0.085 mm2 in a 180 nm CMOS process, draws less than 4.5 μA from a 1.5 to 3.3 V supply, and achieves a resolution of 25 mK in a conversion time of 6 ms. This corresponds to a figure of merit of 24 pJ°C2. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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