Journal ArticleDOI
Group Delay Equalized UWB InGaP/GaAs HBT MMIC Amplifier Using Negative Group Delay Circuits
TLDR
In this paper, a negative group delay (NGD) circuit was employed to equalize a group delay variation in a broadband ultra wideband (UWB) InGaP/GaAs heterojunction bipolar transistor (HBT) monolithic microwave integrated circuit (MMIC) amplifier.Abstract:
A negative group delay (NGD) circuit has been employed to equalize a group delay variation in a broadband ultra-wideband (UWB) InGaP/GaAs heterojunction bipolar transistor (HBT) monolithic microwave integrated circuit (MMIC) amplifier. Using the NGD circuit, a part of a salient group delay characteristic in the operation band of broadband amplifiers can be suppressed without an increase of the entire group delay. The MMIC amplifier has a steep group delay increase in the lower frequency region of the full-band UWB band (3.1-10.6 GHz) due to the sum of phase variations near the cutoff frequencies of the HBTs. The NGD circuit has been inserted to reduce this increase of the group delay in the UWB band. By adding a three-cell NGD circuit while considering input and output matching at the input side of the MMIC amplifier, the group delay variation is decreased by 78%. However, gain was also decreased by insertion of the multistage NGD circuit. In an attempt to avoid this decrease in gain, a one-cell NGD circuit was inserted into the feedback loop of the MMIC amplifier, and as a result, we were able to decrease the group delay variation by 79%, with minimal gain deterioration.read more
Citations
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Journal ArticleDOI
Similitude between the NGD function and filter gain behaviours
TL;DR: The introduced transform relationships simplify the synthesis of any NGD circuits from simple elementary low-pass NGD topologies, and the possibility of the ultra-wideband pulse signals propagating in time-advance is verified.
Journal ArticleDOI
Theory of Coupled Line Coupler-Based Negative Group Delay Microwave Circuit
TL;DR: In this article, a fundamental theory of coupled line coupler-based negative group delay (NGD) topology is established, which consists of the isolated-and coupled-accesses connected in a feedback loop through a lossy interconnect line.
Journal ArticleDOI
A Compact Transmission-Line Self-Matched Negative Group Delay Microwave Circuit
TL;DR: A compact self-matched negative group delay (NGD) circuit without the need for an external matching circuit is proposed and to verify the design concept, an NGD circuit with the size of $0.39\lambda _{g}\times 0.19\lambda_{g}$ is designed and fabricated.
Journal ArticleDOI
Theory and circuit modeling of baseband and modulated signal delay compensations with low- and band-pass NGD effects
TL;DR: In this paper, the authors proposed a correction technique based on the use of the negative group delay (NGD) circuits, which can compensate the signal delay in baseband frequency up to hundreds MHz with low-pass NGD circuit and 2.45 GHz modulated microwave signals with band-pass ND circuit.
Journal ArticleDOI
A Compact Dual-Band Negative Group Delay Microwave Circuit
TL;DR: In this paper, a dual-band negative group delay circuit (NGDC) is proposed, which is composed of an open-circuited transmission line and two resistors connected by two transmission lines.
References
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TL;DR: In this article, the authors provide a brief historical perspective of UWB, discusses recent techniques for the generation and reception of short-pulse electromagnetic waveforms, and examines a number of recently developed UWB systems in the communications, radar, and precision-positioning fields.
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TL;DR: An ultrawideband 3.1-10.6-GHz low-noise amplifier employing an input three-section band-pass Chebyshev filter using a 0.18-/spl mu/m CMOS process achieves a power gain of 9.3 dB with an input match of -10 dB over the band.
Proceedings ArticleDOI
Negative Group Delay Circuit for Feed-Forward Amplifier
TL;DR: It is confirmed that the delay line of the distortion cancellation loop is shortened 40% by connecting the circuit to the driver stage of the error amplifier.
Journal ArticleDOI
Broadband negative group delay networks for compensation of microwave oscillators and filters
C.D. Broomfield,Jeremy Everard +1 more
TL;DR: In this article, the design of distributed broadband negative group delay circuits operating from 3 to 6 GHz with negative group delays of around 50 ps is described, which are designed using LCR prototypes which are then converted to printed transmission line structures.
Proceedings ArticleDOI
Synthesis of Broadband Negative Group Delay Active Circuits
TL;DR: In this paper, the design and synthesis of active circuits able to simultaneously produce negative group delay and gain at microwave frequencies or for baseband signals is discussed, and a synthesis approach is extracted and applied to design a two-stage microwave circuit, further validated by experimental results.