A 0.5V 0.5mW switching current source oscillator

Babaie, Masoud; Shahmohammadi, Mina; Staszewski, Robert Bogdan

doi:10.1109/rfic.2015.7337735

Cited by 12 publications

(8 citation statements)

References 6 publications

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“…The transformer-based tank's input equivalent resistance, R in , and voltage gain, A 0 , should be maximized for the best system efficiency. They are a strong function of ζ=L 2 C 2 /L 1 C 1 [18], [41], as shown in Fig. 12.…”

Section: E Optimizing Transformer-based Tankmentioning

confidence: 82%

“…This ratio gets even lower as the TX output power reduces. By considering both scenarios, the energy consumption of the frequency synthesizer could even be larger than that of the PA. Consequently, RF oscillators, as one of the BLE transceiver's most power-hungry circuitry, must be very power efficient and preferably operate directly at the energy harvester output [18].…”

Section: Switching Current-source Dcomentioning

confidence: 99%

“…As a result, the global optimum load capacitance, C L(opt) , may be estimated by Q s /Q p /(k m R L ω 0 ). Note that both (16) and (18) are more general and accurate than in [42]. Using the optimum ξ and Q L , the maximum η p will be given by…”

Section: A Efficiency and Selectivity Tradeoff In Transformer-based mentioning

confidence: 99%

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A Fully Integrated Bluetooth Low-Energy Transmitter in 28 nm CMOS With 36% System Efficiency at 3 dBm

Babaie

Kuo

Chen

et al. 2016

IEEE J. Solid-State Circuits

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We propose a new transmitter architecture for ultra-low power radios in which the most energy-hungry RF circuits operate at a supply just above a threshold voltage of CMOS transistors. An all-digital PLL employs a digitally controlled oscillator with switching current sources to reduce supply voltage and power without sacrificing its startup margin. It also reduces 1/f noise and supply pushing, thus allowing the ADPLL, after settling, to reduce its sampling rate or shut it off entirely during a direct DCO data modulation. The switching power amplifier integrates its matching network while operating in class-E/F2 to maximally enhance its efficiency at low voltage. The transmitter is realized in 28 nm digital CMOS and satisfies all metal density and other manufacturing rules. It consumes 3.6 mW/5.5 mW while delivering 0 dBm/3 dBm RF power in Bluetooth Low-Energy mode.

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Section: E Optimizing Transformer-based Tankmentioning

confidence: 82%

Section: Switching Current-source Dcomentioning

confidence: 99%

See 1 more Smart Citation

A Fully Integrated Bluetooth Low-Energy Transmitter in 28 nm CMOS With 36% System Efficiency at 3 dBm

Babaie

Kuo

Chen

et al. 2016

IEEE J. Solid-State Circuits

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“…Consequently, reducing DCO's power consumption (P DCO ) is the ultimate goal of IoT applications. The P DCO can be calculated by [1] …”

Section: Switching Current Source Oscillatormentioning

confidence: 99%

“…Lower P DCO is typically addressed by scaling up R p =L p ω 0 Q t simply via a large multi-turn inductor [2]. However, (1) indicates that topology parameters such as oscillator's α I and minimum supply voltage (V DDmin ) can also play an important role in the minimum achievable P DC . Fig.…”

Section: Switching Current Source Oscillatormentioning

confidence: 99%