A Technique to Reduce Phase/Frequency Modulation Bandwidth in a Polar RF Transmitter

Zhuang, Jingcheng; Waheed, K.; Staszewski, Robert Bogdan

doi:10.1109/tcsi.2009.2037394

Cited by 38 publications

(14 citation statements)

References 19 publications

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“…4(b) represents another headwind for such task, as it underscores the fact that V osc,pk decreases as the oscillator is steered away from the resonant frequency of the LC-tank, which will consequently degrade the DCO phase noise. However, the extent of that degradation is somewhat dependent on the spectral density of the FM signal itself [6]. Typically, a significant population of discrete frequencies of the modulated signal is concentrated around the carrier Therefore, the injection-locked DCO, for the most part, operates close to the resonance frequency of the LC-tank.…”

Section: A Further Experiments In Wideband Modementioning

confidence: 99%

A Digitally Controlled Injection-Locked Oscillator With Fine Frequency Resolution

Bashir

Staszewski

Balsara

2016

IEEE J. Solid-State Circuits

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We propose a digitally controlled injection-locked RF oscillator with an auxiliary loop as an alternative to the conventional capacitive fine-tuning of an LC-tank. The oscillator is injection locked to a time-delayed version of its resonating voltage and its frequency is modulated by manipulating the phase and amplitude of injected current. The injection strength can be programmed for the DCO step size to be as fine as 9 kHz at 4 GHz. Alternatively, with large injection strength, the tuning range can reach up to 200 MHz. The proposed oscillator is experimentally verified in TSMC 40 nm digital CMOS.Index Terms-All-digital PLL (ADPLL), digital phase rotator (DPR), digital-to-frequency converter (DFC), digitally controlled delay (DCD), digitally controlled oscillator (DCO), multi-stage noise ΣΔ (MASH).

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Section: A Further Experiments In Wideband Modementioning

confidence: 99%

A Digitally Controlled Injection-Locked Oscillator With Fine Frequency Resolution

Bashir

Staszewski

Balsara

2016

IEEE J. Solid-State Circuits

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“…This usually translates to higher occupied bandwidth of the output signal compared to the input signal, known as bandwidth expansion. The problem of signal bandwidth expansion has been noticed and studied in the context of polar transmitters [26]. Figure 35 shows the power spectral density (PSD) of a complex base-band QAM signal passed through a raised cosine pulse-shaping filter and PSD of its magnitude and phase components.…”

Section: Bandwidth Expansionmentioning

confidence: 99%

Polar Quantizer for Wireless Receivers: Theory, Analysis, and CMOS Implementation

Nazari

Chun

Tzeng

et al. 2014

IEEE Trans. Circuits Syst. I

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“…In [9] it was shown that reducing the zero crossings of the IQ signal controls the bandwidth expansion in polar technique. The bandwidth expansion issue was addressed in [16] by moving the signal trajectory away from the origin. Here, a trajectory hole was created to avoid the transitions close to origin.…”

Section: Phase Signal Conditioningmentioning

confidence: 99%

Signal conditioning for polar all-digital OFDM wireless transmitters

Veetil

Helaoui

2014

2014 IEEE Dallas Circuits and Systems Conference (DCAS)

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A novel scheme for conditioning OFDM modulated signals is proposed to facilitate the implementation of mixerless all-digital transmitter using polar RF Digital to Analog Converters (RFDACs). The signal conditioning is applied to the OFDM signal to avoid phase discontinuities, thus mitigating the effects of bandwidth expansion in polar decomposition. The absence of mixers and filters offers wide RF bandwidth and takes the design a step closer to reconfigurable transmitter. To validate this concept, the signal conditioning is applied to an LTE signal and sent to a phase modulator circuit. The performance of the phase modulator in terms of signal quality is assessed using Normalized Mean Square Error (NMSE) metric. It is concluded that the signal conditioning results in a signal that may not comply with the existing standards, but is spectrally efficient and thus enables the use of polar architectures for wideband signals.

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A Technique to Reduce Phase/Frequency Modulation Bandwidth in a Polar RF Transmitter

Cited by 38 publications

References 19 publications

A Digitally Controlled Injection-Locked Oscillator With Fine Frequency Resolution

A Digitally Controlled Injection-Locked Oscillator With Fine Frequency Resolution

Polar Quantizer for Wireless Receivers: Theory, Analysis, and CMOS Implementation

Signal conditioning for polar all-digital OFDM wireless transmitters

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