A 5.5mA 2.4-GHz two-point modulation Zigbee transmitter with modulation gain calibration

Yu, Rui; Yeo, Theng-Tee; Tan, Kwang-Hung; Mou, Shouxian; Yike, Cui; Wang, Haifeng; Yap, Hwa-Seng; Ting, Eugene; Itoh, M.

doi:10.1109/cicc.2009.5280802

Cited by 15 publications

(3 citation statements)

References 7 publications

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“…In practice, the mismatch between the two transfer functions, arising from component spreads, requires some sort of calibration, which can be achieved by multiplying the modulation signal by a digital gain g 0 [2], [17], as shown in Fig. 5.…”

Section: Pll With Two-point-injection Schemementioning

confidence: 99%

A 23-GHz Low-Phase-Noise Digital Bang–Bang PLL for Fast Triangular and Sawtooth Chirp Modulation

Cherniak

Grimaldi

Bertulessi

et al. 2018

IEEE J. Solid-State Circuits

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This paper describes a 23-GHz digital bang-bang phase-locked loop (PLL) fabricated in 65-nm CMOS for millimeter-wave frequency-modulated continuous-wave radars. The presented circuit aims to generate a fast sawtooth chirp signal that grants significant advantages with respect to the more conventional triangular waveform. Such a signal, however, features a very large bandwidth that requires the adoption of a two-point injection scheme. This paper, after intuitively discussing how the nonlinearity of the digitally controlled oscillator affects the accuracy of frequency modulation, presents a novel automatic pre-distortion engine, operating fully in background, which linearizes the tuning characteristic. The 19.7-mA fractional-N PLL having an rms jitter of 213 fs and an in-band fractional spur of −58 dBc is capable of synthesizing fast chirps with 173-MHz/µs maximum slope and an idle time of less than 200 ns after an abrupt frequency step with no over or undershoot.

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Section: Pll With Two-point-injection Schemementioning

confidence: 99%

A 23-GHz Low-Phase-Noise Digital Bang–Bang PLL for Fast Triangular and Sawtooth Chirp Modulation

Cherniak

Grimaldi

Bertulessi

et al. 2018

IEEE J. Solid-State Circuits

View full text Add to dashboard Cite

show abstract

“…Several CMOS ZigBee transceivers have been reported in recent years [3][4][5][6][7][8][9][10][11][12]. The super heterodyne receiver which consumes much more power is not favorable for low power applications [3].…”

Section: Introductionmentioning

confidence: 99%

“…Unfortunately, it has some serious drawbacks, such as frequency drift, instability and high in-band phase noise. The VCO-based two-point modulation transmitter has an inherent mismatch of gain and phase in two modulation loops which will seriously degrade error vector magnitude (EVM) performance in practical applications [6,12]. These methods are still inadequate for achieving low power and cost transceivers.…”

Section: Introductionmentioning

confidence: 99%