New tunable phase oscillator structure

ABSTRACT

In this Letter, we introduce and experimentally verify a very simple tunable-phase oscillator structure based on cascaded standard filter sections. In particular, a standard inverting second-order low-pass filter is cascaded with a first-order bi-linear filter in a closed loop resulting in a third-order structure that can be made marginally stable. The phase difference between the outputs of the two filter sections is a design parameter that is tunable independent of the oscillation frequency or start-up gain.

KEYWORDS:

• Sinusoidal oscillators
• multi-phase oscillators
• tunable phase
• low-pass filters
• all-pass filters

Disclosure statement

No potential conflict of interest was reported by the author(s).