Title :
The phase invariance condition for the ultra-wideband voltage controlled attenuator
Author_Institution :
Tomsk Polytech. Univ., Tomsk
Abstract :
A necessary condition for minimum of the phase shift vs. attenuation in a voltage controlled attenuator (VCA) is founded on the base of the linear system theory. The condition consists of equality of numerator and denominator polynomial degrees for the transfer function. Also the paper discloses details of the new VCA structure based on the cross-coupling circuits and discusses its performance. Its main difference from known consists in ultra wide band feature and large range of attenuation, where minimum of the phase shift is provided. As a result, the output parameters and adjusting parameters of diodes are founded.
Keywords :
attenuators; phase shifters; transfer functions; ultra wideband technology; cross-coupling circuits; denominator polynomial degrees; linear system theory; numerator polynomial degrees; phase invariance condition; transfer function; ultra-wideband voltage controlled attenuator; Attenuation; Attenuators; Circuits; Control systems; Diodes; Linear systems; Polynomials; Transfer functions; Ultra wideband technology; Voltage control; Attenuator linear model; low phase shift; phase invariance; voltage controlled attenuator;
Conference_Titel :
Communications, Control and Signal Processing, 2008. ISCCSP 2008. 3rd International Symposium on
Conference_Location :
St Julians
Print_ISBN :
978-1-4244-1687-5
Electronic_ISBN :
978-1-4244-1688-2
DOI :
10.1109/ISCCSP.2008.4537189
