A 2.4-GHz ZigBee Transmitter Using a Function-Reuse Class-F DCO-PA and an ADPLL Achieving 22.6% (14.5%) System Efficiency at 6-dBm (0-dBm) $P_{\mathrm {out}}$

Peng, Xingqiang; Yin, Jun; Mak, Pui-In; Yu, Wei-Han; Martins, Rui P.

doi:10.1109/jssc.2017.2672990

Cited by 22 publications

(9 citation statements)

References 15 publications

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“…Resilience to jammers is validated in the same manner as in [14] by means of connecting the signal generator, DCO-PA output, and spectrum analyzer to a three-port circulator, which allows the signal to travel in the direction of signal generator → DCO-PA output pin → spectrum analyzer. The scenario of applying a −30-dBm interferer at f = 5 MHz offset frequency from the 2.4-GHz carrier is sketched in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The scenario of applying a −30-dBm interferer at f = 5 MHz offset frequency from the 2.4-GHz carrier is sketched in Fig. 16(a) showing a jammer image spur at −41 dBm, which is 28 dB better (lower) than that in [14], which barely provides any isolation between the antenna and oscillator. The single-MOS DCO-PA is so robust that can hardly get injectionlocked by the interferers even as strong as 0 dBm, shown as the blue curve in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…A DCO-PA-LNA-TX/RX-switch co-designed block proposed in [16] delivers TX power by connecting the antenna to the sources of the cross-coupled transistors pair in the DCO, which suffers from limited output power and injection pulling. Analogously, the impediment to the practical application of the class-F DCO-PA in [14] arises from the insufficient isolation between the antenna and the oscillator, which would make the carrier frequency rather sensitive to the interferers, as previously mentioned in Section I. All the abovementioned techniques are at the expense of introducing additional tradeoffs between system complexity, reliability, and efficiency.…”

Section: Single-mos Dco-pa For Ulp Txmentioning

confidence: 99%

“…This can benefit the overall TX efficiency, especially in the low-power regime. To meet Barkhasusen's criteria for oscillation, a third coil L 3 is added to produce another 180 • loop phase shift through the inverting coupling between L 3 and L 1 in [14] enabling the drain-to-gate (D-to-G) transformer feedback oscillation [see Fig. 3(a)].…”

Section: A S-to-g Transformer-feedback Dco-pamentioning

confidence: 99%

“…There is an inherent tradeoff between the oscillator's PN and total PA efficiency in terms of the supply division between these two. Instead of the current-reuse TX topology, the function-reuse DCO-PA first proposed in [14] seems more promising through assimilating the power consumption of the DCO into the DCO-PA with full V DD utilization and breaking the aforementioned PN and efficiency tradeoff with purely passive (transformer) optimization [see Fig. 2(c)].…”

Section: Introductionmentioning

confidence: 99%

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A Single-Pin Antenna Interface RF Front End Using a Single-MOS DCO-PA and a Push–Pull LNA

Yin

Mak

et al. 2020

IEEE J. Solid-State Circuits

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We propose a simple power-efficient sub-1-V fully integrated RF front end (RFE) for 2.4-GHz transceivers. It introduces the following innovations. First, a function-reuse single-MOS digitally controlled oscillator power amplifier (DCO-PA) with full supply utilization improves antenna-to-DCO isolation for better resilience to jammers. Second, a noninverting transmitter (TX) matching transformer with a zero-shifting capacitor suppresses the second-harmonic emission of the DCO-PA and allows a single-pin antenna interface for both TX and receiver (RX) modes eliminating the transmit/receive (T/R) switches in the signal path. Third, a push-pull low-noise amplifier (LNA) reuses the TX matching transformer for passive gain boosting that reduces power consumption. Fabricated in 65-nm CMOS, the RFE occupies merely 0.17 mm 2. Through the functional merge of the oscillator and PA, it can transmit 0 dBm at RF, featuring 10.2% power efficiency when delivering the RF power as low as −10 dBm at a 0.3-V supply. Under a 0.5-V supply, the LNA shows 11-dB gain and 6.8-dB noise figure (NF) while consuming 174 µW.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%