Method for reducing active Balun phase unbalance degree of wideband CS/CG

Abstract

A method for reducing the bandwidth CS / CG active barron phase position unbalancedness degree belongs to the microwave and millimeter wave integration technical field, and relates to CS / CG active barron phase position performance. Firstly, the physical size of CS / CG FET is determined according to the gain of CS / CG active barron and a current index; secondly the direct current working point of CS / CG FET is set, so as to ensure that the CS / CG FET is operated in saturation state; and then the load resistor ZL1 of CS FET and the load resistor ZL2 are selected, which meet the formula of Cgd_GZL1+ ((Cgs_GZs) / (g m_G Z S+1) + 1+Z S / R CS))= C ds_S Z L2 + ((C GS_S Z S ) / (Z S / R CG+1)), and the average phase position unbalancedness of the CS / CG active barron inside a working bandwidth are obtained after original regulation; finally the direct current offset voltages of the CS / CG active barron is finely regulated, so as to further reduce he average phase position unbalancedness thereof inside the working bandwidth. In the method, load resistors of the CS / CG FET are taken as the main regulation means, and the direct current offset voltage of a dynatron is taken as the auxiliary regulation means, thereby reducing the phase position unbalancedness of CS / CG active barron to minimum. When the phase position unbalancedness of CS / CG active barron is reduced, the structure of the traditional CS / CG active barron is not changed, and the method is simple and is east to operate.

Description

technical field [0001] The invention discloses a method for reducing the unbalance degree of broadband CS / CG (cascode) active balun phase, which belongs to the field of microwave and millimeter wave integration technology and relates to the phase performance of CS / CG active balun. Background technique [0002] Balun is a balanced to unbalanced converter. It is widely used in balanced circuits such as balanced frequency multipliers and balanced mixers. Its function is to change high-frequency signals from single-ended input to balanced output and complete impedance match. Baluns are mainly divided into passive baluns and active baluns. Passive baluns are usually implemented in the form of λ / 4 microstrip transmission lines, and active baluns are usually implemented using triodes. Among them, the passive balun has a larger area and narrower bandwidth, so the active balun is usually used in broadband integration technology. [0003] Among active baluns, the most commonly used ...

AI Technical Summary

Problems solved by technology

It is characterized in that a CG triode is added to the traditional CS / CG active balun structure, which improves the broadband phase balance characteristics of the traditional CS / CG active balun, but due to the addition of the triode, the circuit structure is complicated, and at the same time Increased the difficulty of circuit design and debugging

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