||A Design of 0.7-V 400-MHz Digitally-Controlled Oscillator
Bae, Jungnam ,
Radhapuram, Saichandrateja ,
Jo, Ikkyun ,
Kihara, TakaoMatsuoka, Toshimasa
IEICE TRANSACTIONS on Electronics
1186 , 2015-12-01 , 電子情報通信学会 , デンシ ジョウホウ ツウシン ガッカイ , The Institute of Electronics, Information and Communication Engineers
We present a low-voltage digitally-controlled oscillator (DCO) with the third-order ΔΣ modulator utilized in the medical implant communication service (MICS) frequency band. An optimized DCO core operating in the subthreshold region is designed, based on the gm/ID methodology. Thermometer coder with the dynamic element matching and ΔΣ modulator are implemented for the frequency tuning. High frequency resolution is achieved by using the ΔΣ modulator. The ΔΣ-modulator-based LC-DCO implemented in a 130-nm CMOS technology has achieved the phase noise of -115.3 dBc/Hz at 200 kHz offset frequency with the tuning range of 382 MHz to 412 MHz for the MICS band. It consumes 700 µW from a 0.7-V supply voltage and has a high frequency resolution of 18 kHz.