Novel approximate square-root domain all-pass filter with application to multiphase oscillators


Ozoguz S., ABDELRAHMAN T., ELWAKIL A.

ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSING, vol.46, no.3, pp.297-301, 2006 (SCI-Expanded) identifier identifier

Abstract

A novel approximate square-root domain all-pass filter operating from a single 3.3 V supply is reported. The circuit requires a small number of transistors, with a bandwidth exceeding 100 MHz. Two-phase and three-phase oscillators based on cascaded sections of the proposed filter are constructed followed by a generic multiphase oscillator. Simulation results, using AMS 0.35 mu BiCMOS technology parameters, and experimental results are given.