Title :
Nonlinear analysis of noise in current-steering variable gain amplifiers
Author :
Schneider, Angelika ; Werther, Oliver
Author_Institution :
Microtune Inc., Plano, TX, USA
Abstract :
This paper investigates the difference between the small-signal noise figure and the noise figure in the presence of a large signal at the input of a current-steering variable gain pair. The mechanism of noise generation in the presence of a large signal at the emitters of the current-steering pair is analyzed for single-ended and differential operation. An analytical equation for the large-signal noise figure is derived. The results are applied to a cable TV IF amplifier and compared to measured data.
Keywords :
BiCMOS analogue integrated circuits; integrated circuit noise; video amplifiers; BiCMOS analog integrated circuits; cable TV IF amplifier; current-steering pair; current-steering variable gain amplifiers; emitter-driven pair; gain control; integrated circuit design; integrated circuit noise; large-signal noise figure; nonlinear analysis; small-signal noise figure; Cable TV; Degradation; Demodulation; Gain control; Noise figure; Noise generators; Noise measurement; Signal analysis; Tuners; Voltage;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2003.821782
