An interpolative bandpass converter on a 1.2- mu m BiCMOS analog/digital array

Tröster, Gerhard; Dreßler, Hans-Joachim; Golberg, H.-J.; Schardein, W.; Zocher, E.; Wedel, Armin; Schoppe, K.; Arndt, J

doi:10.1109/4.210030

Cited by 33 publications

(8 citation statements)

References 12 publications

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“…For each output of the sampler which is an impulse function, the output of the DAC which is represented by a zeroth-order-hold is a rectangular pulse of width which can be described by the difference of two unit step functions (8) The local-oscillator signal is and the mixer output is the multiplication of the zeroth-order-hold output and the localoscillator signal (9) 2 In practice, zero bandwidth is impractical, and a high-Q filter is required to get a deep notch. This can be achieved through a Q-enhanced filter [17], [18].…”

Section: A -Domain Loop Transfer Functionmentioning

confidence: 99%

“…A continuous time modulator is typically much faster in the same process which makes it suitable for high frequency applications. For this reason, continuous-time circuits that use Gm-C techniques [4] or inductance-capacitance (LC) filters [5]- [8] have been proposed. In the latter case, LC filter-based converters have generally relied on off-chip inductors since it is difficult to construct linear high Q LC resonators on chip.…”

Section: Introductionmentioning

confidence: 99%

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Bandpass ΣΔ modulator employing undersampling of RF signals for wireless communication

Hussein

Kuhn

2000

IEEE Trans. Circuits Syst. II

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The rapid development of digital wireless systems has led to a need for high-resolution and high-speed bandpass analog-to-digital converters. Continuous-time bandpass 61 modulators are very suitable for such high frequency applications. In this paper, analysis and simulation of a continuous-time bandpass 61 modulator for use in modern cellular/PCS receivers is given. The design employs undersampling relative to a radio receiver's radio frequency (RF) or intermediate frequency (IF) center frequency, while oversampling the signal bandwidth. This technique enables clocking at a frequency much lower than the RF/IF frequency, allowing use of standard CMOS technology and reducing the complexity and power consumption of subsequent digital signal processing stages. The analysis shows that it is possible to achieve a loop transfer function that matches a standard discrete-time bandpass 61 modulator while operating at sample rates significantly lower than conventional bandpass architectures.

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Section: A -Domain Loop Transfer Functionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bandpass ΣΔ modulator employing undersampling of RF signals for wireless communication

Hussein

Kuhn

2000

IEEE Trans. Circuits Syst. II

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“…(Chao, et al, 1990;Troster, et al, 1993;Moussavi, 1994;Aziz and Sorensen, 1996;Brooks, et al, 1997). Three of common structures are collected here:…”

Section: Implementation Structurementioning

confidence: 99%

1-Bit processing based model predictive control for fractionated satellite missions

Bai

2014

Acta Astronautica

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In this thesis, a 1-bit processing based Model Predictive Control (OBMPC) structure is proposed for a fractionated satellite attitude control mission. Despite the appealing advantages of the MPC algorithm towards constrained MIMO control applications, implementing the MPC algorithm onboard a small satellite is certainly challenging due to the limited onboard resources. The proposed design is based on the 1-bit processing concept, which takes advantage of the affine relation between the 1-bit state feedback and multi-bit parameters to implement a multiplier free MPC controller.As multipliers are the major power consumer in online optimization, the OBMPC structure is proven to be more efficient in comparison to the conventional MPC implementation in term of power and circuit complexity. The system is in digital control nature, affected by quantization noise introduced by Δ∑ modulators. The stability issues and practical design criteria are also discussed in this work.Some other aspects are considered in this work to complete the control system. Firstly, the implementation of the OBMPC system relies on the 1-bit state feedbacks. Hence, 1-bit sensing components are needed to implement the OBMPC system. While the ∆∑ modulator based Microelectromechanical systems (MEMS) gyroscope is considered in this work, it is possible to implement this concept into other sensing components.Secondly, as the proposed attitude mission is based on the wireless inter-satellite link (ISL), a state estimator is required. However, conventional state estimators will once again introduce multi-bit signals, and compromise the simple, direct implementation of the OBMPC controller. Therefore, the 1-bit state estimator is also designed in this work to satisfy the requirements of the proposed fractionated attitude control mission.The simulation for the OBMPC is based on a 2U CubeSat model in a fractionated satellite structure, in which the payload and actuators are separated from the controller and controlled via the ISL. Matlab simulations and FPGA implementation based performance analysis shows that the OBMPC is feasible for fractionated satellite missions and is advantageous over the conventional MPC controllers. V VI

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“…Due to the fact that discrete-time modulators must sample a fastchanging signal with great precision, other researchers have been concentrating on continuous-time implementations employing discrete inductors and capacitors [6][ 121.…”

Section: Bandpass Modulator Circuitsmentioning

confidence: 99%

Bandpass delta-sigma data converters

Schreier

Conference Record of the Twenty-Ninth Asilomar Conference on Signals, Systems and Computers

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A standard (lowpass) delta-sigma converter uses a sampling frequency which must be many times greater than the highest signal frequency of interest. In contrast, a bandpass delta-sigma data converter needs a sampling rate which is only a few times greater than the highest frequency of interest. Bandpass data converters facilitate high precision analog-to-digital conversion of narrowband bandpass signals in the MHz range. They find application in digital communication systems, spectrum analyzers and specialpurpose instrumentation. This paper describes some of the theory behind the technique and summarizes results reported in the literature.

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An interpolative bandpass converter on a 1.2- mu m BiCMOS analog/digital array

Cited by 33 publications

References 12 publications

Bandpass ΣΔ modulator employing undersampling of RF signals for wireless communication

Bandpass ΣΔ modulator employing undersampling of RF signals for wireless communication

1-Bit processing based model predictive control for fractionated satellite missions

Bandpass delta-sigma data converters

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