Quadrature integral noise shaping for generation of modulated RF signals

Midya, P.; Wagh, P.; Rakers, P.

doi:10.1109/mwscas.2002.1186917

Cited by 16 publications

(13 citation statements)

References 2 publications

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“…Little deviation of the symbol vectors from the eight homocentric points is observed in the constellations, which results from limited quantization resolutions, unit-delay Figure 12 shows transmitter normalized output spectrums centered at 50 MHz for CF PWM and at 200 MHz for IF PWM. The noise floor less than 60 dB is observed below the carrier, and 20 dB spectrum optimization is achieved when compared to the existing designs [3][4][5] with the noise floor at 40 dB below the carrier. For ''CF PWM'' mode, not any other frequency components exist, except for the carrier.…”

Section: Simulated Resultsmentioning

confidence: 88%

“…The existing transmitters based on polar intermediate-frequency (IF) pulse-width modulation (PWM) [3,4], are not apt for low CF applications, under which the band-pass filter (BPF) fails to suppress IF components or harmonics close to the carrier. The existing quadrature IF PWM architecture [5] with high modulation resolution, is not apt for low CF cases due to IF interferences and faces intractable 3-level up-conversion implementation under single-supply process. The existing radiofrequency (RF) PWM [6] or direct digital frequency synthesizer (DDFS) [7] based transmitters aiming at low CF conditions, are not considered as fully-digital designs, since analogue feedback or mixed-signal configurations are used.…”

Section: Introductionmentioning

confidence: 99%

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Pulse-width modulation based fully-digital transmitter with wide CF and high resolution

Zhang

Zhou

2015

Analog Integr Circ Sig Process

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The overview and design of fully-digital transmitters based on pulse-width modulation (PWM) are clarified. By employing the parallel architecture with quadrature intermediate-frequency (IF) PWM and precorrected polar carrier-frequency (CF) PWM, a fullydigital transmitter is proposed and designed in 180 nm CMOS, with wide CF and high modulation resolution. The presented PWMs are based on delay lines and multiplexers with the unit delay automatically calibrated. Inductive differential power combination with 2-level quadrature operation is proposed to accomplish the equivalent 3-level up-conversion for IF PWM. Piecewise-linearization correction technique is presented to ensure the envelopemodulation fidelity for CF PWM. For 8PSK based EDGE baseband signals, the proposed transmitter achieves a wide CF range of 2 M-1.5 GHz and a low error vector magnitude less than 3 %, with 20 dB spectrum optimized and higher modulation resolution in comparison to the existing designs. Excluding the power amplifiers, the presented implementation dissipates 120 lW from a 1.8 V power supply under the data rate of 270.833 kS/s or 812.5 kb/s, thus achieves the figure of merit of 0.44 nJ/S or 0.15 nJ/bit.

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Section: Simulated Resultsmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Pulse-width modulation based fully-digital transmitter with wide CF and high resolution

Zhang

Zhou

2015

Analog Integr Circ Sig Process

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“…However, only simulation results or non real-time test results have been presented in literature [8,10,16]. In these works, the digital RF signals were computed offline and stored in pattern generator for the purpose of measurement.…”

Section: Figure 2 All-digital Transmitter Architecturementioning

confidence: 99%

“…Almost all the transmitter's functionalities can be incorporated in the digital signal processing engine using FPGAs except the RF power amplification and simple filtering. The advantages of all-digital transmitters are: potential high efficiency power amplification ( [8,10]), the capabilities of digitally combining signals from multiple channels, and software programmability. …”

Section: Introductionmentioning

confidence: 99%

An FPGA Based All-Digital Transmitter with Radio Frequency Output for Software Defined Radio

Ye¹,

Grosspietsch²,

Memik

2007

2007 Design, Automation &Amp; Test in Europe Conference &Amp; Exhibition

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“…The existing intermediate-frequency (IF) pulse-width modulation (PWM) based fully digital transmitters, with quadrature [1,2] or delay-line [3] architectures, are prone to spectrum aliasing between the IF and the CF. Especially under low CF conditions, the bandpass filter (BPF) fails to suppress the IF component and harmonics closer to the CF signal.…”

mentioning

confidence: 99%

Reconfigurable fully digital transmitter with carrier‐frequency pulse‐width modulation

et al. 2013

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A reconfigurable fully digital transmitter with carrier-frequency (CF) pulse-width modulation (PWM) is implemented in 180 nm CMOS for low CF applications. Through delay lines, baseband phases are mapped to position delays of 1/4 period of a carrier clock. With delay lines based CF PWM, pre-corrected baseband envelopes are converted to pulse-widths of the position-modulated carrier clock. Both the pulse-widths and the positions of the modulated carrier clock are amplified and reshaped to the sine-wave carrier with baseband components by the sequent switched-mode power amplifier and a bandpass filter. The circuit-level simulation results verify that the proposed implementation achieves reconfigurable CF and 20 dB spectrum optimisation, when compared with the existing intermediate-frequency PWM based designs.

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Quadrature integral noise shaping for generation of modulated RF signals

Cited by 16 publications

References 2 publications

Pulse-width modulation based fully-digital transmitter with wide CF and high resolution

Pulse-width modulation based fully-digital transmitter with wide CF and high resolution

An FPGA Based All-Digital Transmitter with Radio Frequency Output for Software Defined Radio

Reconfigurable fully digital transmitter with carrier‐frequency pulse‐width modulation

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