L-Band SiGe HBT Clapp and Hartley VCOs Using Double Varactor Diodes and Dual-Band Resonators for High Frequency and Wide Bandwidth Oscillations

From the perspectives of characterized data, calibrated TCAD simulations and compact modeling, we present a deeper investigation of the very high frequency behavior of state-of-the-art sub-THz silicon germanium heterojunction bipolar transistors (SiGe HBTs) fabricated with 55-nm BiCMOS process technology from STMicroelectronics. The TCAD simulation platform is appropriately calibrated with the measurements in order to aid the extraction of a few selected high-frequency (HF) parameters of the state-of-the-art compact model HICUM, which are otherwise difficult to extract from traditionally prepared test-structures. Physics-based strategies of extracting the HF parameters are elaborately presented followed by a sensitivity study to see the effects of the variations of HF parameters on certain frequency-dependent characteristics until 500 GHz. Finally, the deployed HICUM model is evaluated against the measured s-parameters of the investigated SiGe HBT until 500 GHz.

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Electrically small dual-band substrate-integrated-waveguide antenna with fixed low-frequency and tunable high-frequency bands

IEICE Electronics Express ◽

10.1587/elex.11.20140007 ◽

2014 ◽

Vol 11 (5) ◽

pp. 20140007-20140007 ◽

Cited By ~ 3

Author(s):

Hyunseong Kang ◽

Sungjoon Lim

Keyword(s):

High Frequency ◽

Low Frequency ◽

Dual Band ◽

Substrate Integrated Waveguide ◽

Frequency Bands

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Dual-Band, Differentially-Fed Filtenna with Wide Bandwidth, High Selectivity and Low Cross-Polarization

IEEE Transactions on Antennas and Propagation ◽

10.1109/tap.2021.3138505 ◽

2022 ◽

pp. 1-1

Author(s):

Dajiang Li ◽

Ming-Chun Tang ◽

Yang Wang ◽

Kun-Zhi Hu ◽

Richard W. Ziolkowski

Keyword(s):

High Selectivity ◽

Dual Band ◽

Cross Polarization ◽

Wide Bandwidth

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Rapid Recovery of Wide-Bandwidth Photothermal Signals via Homodyne Photothermal Spectrometry: Theory and Methodology

Applied Spectroscopy ◽

10.1366/0003702934334994 ◽

1993 ◽

Vol 47 (4) ◽

pp. 489-500 ◽

Cited By ~ 4

Author(s):

J. F. Power ◽

M. C. Prystay

Keyword(s):

High Frequency ◽

Low Cost ◽

Signal Recovery ◽

Wide Bandwidth ◽

Pass Filter ◽

Low Pass Filter ◽

Filter Output ◽

Low Pass ◽

Four Quadrant ◽

Lock In

Homodyne photothermal spectrometry (HPS) is a very wide bandwidth signal recovery technique which uses many of the elements of lock-in detection at very low cost. The method uses a frequency sweep, with a high-frequency bandwidth of up to 10 MHz, to excite a linear photothermal system. The response sweep of the photothermal system is downshifted into a bandwidth of a few kilohertz by means of in-phase mixing with the excitation sweep with the use of a four-quadrant double-balanced mixer and a low-pass filter. Under conditions derived from theory, the filter output gives a good approximation to the real part of the photothermal system's frequency response, dispersed as a function of time. From a recording of this signal, the frequency and impulse response of the photothermal system are rapidly recovered at very high resolution. The method has been tested with the use of laser photopyroelectric effect spectrometry and provides an inexpensive, convenient method for the recovery of high-frequency photothermal signals.

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