A 400-mV 2.4-GHz frequency-shift keying transmitter using a capacitor switch across a transformer for a wide tuning range voltage-controlled oscillator

Yasunori Miyahara, Keisuke Ishikawa, Tadahiro Kuroda

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We use a simple directly modulated closed loop to develop a 2.1-mW, 2.4-GHz frequency-shift keying (FSK) transmitter that operates on 400-mV DC supply. Connecting a capacitor bank switch via a transformer in the voltage control oscillator (VCO) to the frequency-divider circuit expands the frequency tuning range without reducing VCO performance. A prototype was fabricated using the 65-nm standard CMOS process with a chip size of 1.65 × 1.85mm2. A modulation output signal spectrum of %42 dBc at 1.5MHz with %6dBm at the PA buffer output terminal; moreover, a VCO phase noise of %101 dBc/Hz at 1MHz is achieved. The FSK transmitter can readily use voltages supplied by harvested energy because of the low power consumption of the sensor network.

Original languageEnglish
Article number04CF04
JournalJapanese Journal of Applied Physics
Volume56
Issue number4
DOIs
Publication statusPublished - 2017 Apr 1

Fingerprint

frequency shift keying
voltage controlled oscillators
Frequency shift keying
Variable frequency oscillators
transformers
Voltage control
transmitters
Transmitters
capacitors
Capacitors
switches
Tuning
tuning
Switches
oscillators
electric potential
Phase noise
frequency dividers
Sensor networks
output

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

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abstract = "We use a simple directly modulated closed loop to develop a 2.1-mW, 2.4-GHz frequency-shift keying (FSK) transmitter that operates on 400-mV DC supply. Connecting a capacitor bank switch via a transformer in the voltage control oscillator (VCO) to the frequency-divider circuit expands the frequency tuning range without reducing VCO performance. A prototype was fabricated using the 65-nm standard CMOS process with a chip size of 1.65 × 1.85mm2. A modulation output signal spectrum of {\%}42 dBc at 1.5MHz with {\%}6dBm at the PA buffer output terminal; moreover, a VCO phase noise of {\%}101 dBc/Hz at 1MHz is achieved. The FSK transmitter can readily use voltages supplied by harvested energy because of the low power consumption of the sensor network.",
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