A 2.4 GHz Wideband Open-Loop GFSK Transmitter With Phase Quantization Noise Cancellation

Su, Pin-En; Pamarti, Sudhakar

doi:10.1109/jssc.2010.2099450

Cited by 22 publications

(10 citation statements)

References 38 publications

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“…When the control signal is high, an effective "on" capacitance may be designated as , and when the control signal is low, the total capacitance of each element will be . Thus, given a digital control code word , and the maximal available code , where is the number of code word bits, the total bank capacitance will be (17) An effective least significant bit (LSB) capacitance can be identified as (18) as well as a constant offset capacitance (19) Any parasitic capacitance, or variation in the intentional MIM capacitor, results in both a constant capacitance offset and a change of the desired LSB value. The change in the LSB and resulting capacitance range may be mitigated by the resistor value as explained earlier.…”

Section: A Switched Capacitor Bankmentioning

confidence: 99%

“…It should be noted that the power quoted for this work includes only the PM and not the circuitry required for the source generation such as a phase-locked loop (PLL), whereas the other systems do include it, therefore the overall power will eventually be higher for the proposed system. The PM described in [17] also achieves a high percentage bandwidth, however it is limited to a relatively low resolution due to the use of phase switching (selection between pre-generated phase offset carriers) to achieve the modulation. All of the compared architectures utilize foreground calibration schemes to deal with nonlinearities and mismatch due to PVT variations apart from the work described in [18], which employs background calibration.…”

Section: G Comparisonmentioning

confidence: 99%

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A Fast Settling Phase Modulator for Outphasing Transmitters in 65-nm CMOS

Yahalom

Dawson

2014

IEEE Trans. Microwave Theory Techn.

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We present a phase modulator architecture with very fast settling time for use in high data-rate outphasing transmitters. The proposed design utilizes the phase-shifting capabilities of a resonant tank and the ability to separately control the circuit properties via its components. A prototype in 65-nm CMOS achieves 9 bits of effective resolution, with a fast settling time of less than five carrier cycles to within 1 . The circuit is also tested as a standalone transmitter showing an error vector magnitude of less than 5% for 8-PSK modulation at maximum data rate of 240 Mb/s, meeting the Federal Communications Commission requirements for operation at the medical implant communication services band. Index Terms-CMOS integrated circuits, phase modulation, phase shifters, RF integrated circuits.0018-9480

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Section: A Switched Capacitor Bankmentioning

confidence: 99%

Section: G Comparisonmentioning

confidence: 99%

A Fast Settling Phase Modulator for Outphasing Transmitters in 65-nm CMOS

Yahalom

Dawson

2014

IEEE Trans. Microwave Theory Techn.

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“…These developments have led to the concept of RFDACs [17]- [21] with possible resolution enhancement in combination with RF PWM [21]. Beside those solutions it is also possible to use sigma delta modulators either for direct signal generation [22] or to enhance the resolution [23]- [25] or efficiency [26].…”

Section: Introductionmentioning

confidence: 99%

Predistortion of Digital RF PWM Signals Considering Conditional Memory

Seebacher

Singerl

Schuberth

et al. 2015

IEEE Trans. Circuits Syst. I

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The trend in transmitter systems is to move the digital domain closer towards the antenna using digital modulators and drivers to reduce circuit complexity and to save power. A common assumption made is that they are capable of generating ideal pulses and thus do not suffer from analog imperfections. But the output signals of real drivers for high frequency operation are not perfectly rectangular anymore, which leads to distortion lowering the signal quality. In this paper the general properties of high frequency digital driver circuits operating at 2.6 GHz are analyzed and the impact of the different effects is presented. The predistortion of such drivers in the context of digital discrete time RF PWM modulators is studied. It has been found that conventional sample based predistortion can only correct the driver nonlinearity from 29 dBc to 49 dBc for the example considered using a 40 MHz bandwidth signal at 2.6 GHz. Therefore a special predistortion scheme considering the impact of pulses adjacent to the other samples is proposed. The mitigation of effects due to the discrete time nature of the signal is considered and discussed in detail. The capabilities of the proposed predistortion scheme are verified by extensive simulations as well as by measurements. By applying the proposed predistortion concept the spectral quality can be further improved to 66 dBc. In addition different scenarios with limited resolution and a carrier frequency offset are analyzed.

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“…Recently, open-loop phase switching technique, that dynamically selects a signal from a bank of signals at the carrier frequency but with different phase offsets, was proposed for digital wide-bandwidth phase modulation. Quadrature signals at the output of a frequency divider [18], output signals of a ring oscillator [19], and phase interpolation [20] were used to form the bank of reference signals. An overview of both open-loop and closed-loop techniques for phase modulation is presented in this paper, contrasting their performance limitations.…”

Section: Introductionmentioning

confidence: 99%

“…Finite resolution in the digital phase modulator results in phase quantization noise (PQN). A PQN cancellation technique was proposed in [20] to reduce the out-of-band emission from the phase modulator. The signal processing details of this technique along with methods to further improve its effectiveness are described in this paper.…”

Section: Introductionmentioning

confidence: 99%

Open-Loop Wide-Bandwidth Phase Modulation Techniques

Nidhi

Pamarti

2011

Journal of Electrical and Computer Engineering

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The ever-increasing growth in the bandwidth of wireless communication channels requires the transmitter to be wide-bandwidth and power-efficient. Polar and outphasing transmitter topologies are two promising candidates for such applications, in future. Both these architectures require a wide-bandwidth phase modulator. Open-loop phase modulation presents a viable solution for achieving wide-bandwidth operation. An overview of prior art and recent approaches for phase modulation is presented in this paper. Phase quantization noise cancellation was recently introduced to lower the out-of-band noise in a digital phase modulator. A detailed analysis on the impact of timing and quantization of the cancellation signal is presented. Noise generated by the transmitter in the receive band frequency poses another challenge for wide-bandwidth transmitter design. Addition of a noise transfer function notch, in a digital phase modulator, to reduce the noise in the receive band during phase modulation is described in this paper.

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A 2.4 GHz Wideband Open-Loop GFSK Transmitter With Phase Quantization Noise Cancellation

Cited by 22 publications

References 38 publications

A Fast Settling Phase Modulator for Outphasing Transmitters in 65-nm CMOS

A Fast Settling Phase Modulator for Outphasing Transmitters in 65-nm CMOS

Predistortion of Digital RF PWM Signals Considering Conditional Memory

Open-Loop Wide-Bandwidth Phase Modulation Techniques

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