A Temperature-to-Digital Converter for a MEMS-Based Programmable Oscillator With $< \pm \hbox{0.5-ppm}$ Frequency Stability and $< \hbox{1-ps}$
| Autor: | Sassan Tabatabaei, Pavan Gupta, Michael H. Perrott, Carl Arft, Jintae Kim, Sudhakar Pamarti, Aaron Partridge, Hae-Chang Lee, Fred Lee, Shouvik Mukherjee, Fari Assaderaghi, Niveditha Arumugam, James Christian Salvia |
|---|---|
| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | IEEE Journal of Solid-State Circuits. 48:276-291 |
| ISSN: | 1558-173X 0018-9200 |
| Popis: | MEMS-based oscillators offer a silicon-based alternative to quartz-based frequency references. Here, a MEMS-based programmable oscillator is presented which achieves better than ±0.5-ppm frequency stability from -40°C to 85°C and less than 1-ps (rms) integrated phase noise (12 kHz to 20 MHz). A key component of this system is a thermistor-based temperature-to-digital converter (TDC) which enables accurate and low noise compensation of temperature-induced variation of the MEMS resonant frequency. The TDC utilizes several circuit techniques including a high-resolution tunable reference resistor based on a switched-capacitor network and fractional-N frequency division, a switched resistor measurement approach which allows a pulsed bias technique for reduced noise, and a VCO-based quantizer for digitization of the temperature signal. The TDC achieves 0.1-mK (rms) resolution within a 5-Hz bandwidth while consuming only 3.97 mA for all analog and digital circuits at 3.3-V supply in 180-nm CMOS. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|