An adaptive biasing method for SRD comb generators

Abstract

This paper presents an adaptive biasing method for step recovery diode based comb generators which are controlled by a software routine. The aim is to provide the maximum possible harmonic output power for a given configuration and different input frequencies during input power variation. This increases the usefulness of comb generators as harmonic phase reference sources for non-linear VNA measurements in the millimeter wave range. The effects are studied on a SRD comb generator which is able to generate -30...-20 dBm harmonics in the 50 to 60 GHz range when wideband terminated. It is shown that depending on the combination of input power and frequency, different bias level behaviors for maximum harmonic output power over frequency exist. Data for maximum power level bias is provided for output frequencies up to 60 GHz. Additionally the effect of subharmonic comb frequency generation is demonstrated.

The Approach on Influence of Biasing Circuit in Wideband Low Noise Amplifier to Evaluate Robustness Performance

“…Ghosh & Srivastava, [10] , gave the symmetric design biasing system, which makes the structure polarization uncaring not at all like which was accounted for active frequency-selective surface(AFSS). Harzheim, Heuermann, & M. Marso, [11], displayed a versatile biasing strategy for step recuperation diode based brush generators which was controlled by a product schedule. The point was to give the most extreme conceivable consonant yield power for a given arrangement and diverse information frequencies amid info power variety.…”

A Study of the Effect of DC Conditions on a 5.8 GHz Power Amplifier’s S-Parameters

“…There are many studies in literature on this subject. Dynamic gate biasing (Gecan et al, 2016), dynamic biasing (Lee et al, 2017;Chen et al, 2016), adaptive biasing (Harzheim, 2016;Cohen et al, 2013;Akbarpour, 2017), and envelope tracking (Auer et al, 2017;Olavsbråten and Gecan, 2017) are some of the methods of changing DC conditions depending on the RF input power signal. In dynamic biasing, dynamic gate biasing and adaptive biasing DC conditions change according to the power of the RF input signal (Tafuri, 2013), whereas in envelope tracking method DC conditions change according to the envelope of the RF input signal (Jing and Bakkaloğlu, 2017).…”

A microwave comb generator based on AlGaN/GaN heterostructure Schottky diodes nonlinear transmission line

“…icrowave frequency combs have attracted considerable attention in terms of vector network analyzers, 1,2) spectrometers, 3) etc. A frequency comb generator can be realized by using step recovery diodes, 4) Josephson junctions, 5) high-speed switching transistors, 6) heterojunction bipolar transistors, 7) and nonlinear transmission lines (NLTLs). 8) Due to the voltage-dependent capacitance of Schottky-barrier diodes (SBDs), a transmission line periodically loaded with reversely biased SBDs forms an NLTL.…”