A low-area switched-resistor loop-filter technique for fractional-N synthesizers applied to a MEMS-based programmable oscillator

A low-area switched-resistor loop-filter technique for fractional-N synthesizers applied to a MEMS-based programmable oscillator

A fractional-N synthesizer is used in a programmable 1 to 115 MHz MEMS oscillator. A high gain phase detector lowers the impact of loop filter noise, and a switched-resistor loop filter avoids a charge pump and boosts effective resistance to save area. The entire synthesizer with LC-VCO occupies 0.3...

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Bibliographische Detailangaben
Hauptverfasser: Perrott, M.H., Pamarti, S., Hoffman, E., Lee, F.S., Mukherjee, S., Lee, C., Tsinker, V., Perumal, S., Soto, B., Arumugam, N., Garlepp, B.W.
Format: Tagungsbericht
Sprache:eng
Schlagworte:
Filters
Frequency conversion
Frequency synthesizers
Micromechanical devices
Phase locked loops
Phase noise
Resistors
Switches
Temperature sensors
Voltage-controlled oscillators
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Beschreibung
Zusammenfassung:A fractional-N synthesizer is used in a programmable 1 to 115 MHz MEMS oscillator. A high gain phase detector lowers the impact of loop filter noise, and a switched-resistor loop filter avoids a charge pump and boosts effective resistance to save area. The entire synthesizer with LC-VCO occupies 0.31 mm 2 in 0.18 ¿m CMOS. Chip consumption is 3.7 mA drawn from a 3.3 V supply for a 20 MHz output with no load.
ISSN:0193-6530
2376-8606
DOI:10.1109/ISSCC.2010.5433937