Oscillator circuit

Abstract

The present invention relates to an oscillator circuit (200a, 200b, 300, 400) comprising a resonant element, an active element, a feedback loop, and an additional loop comprising a phase shifting element.

Description

technical field [0001] The invention relates to oscillator circuits with multiple loops. Background technique [0002] The basic concept of a single-ended oscillator comprising an active element A and a feedback element β is in Figure 5 shown in . To initiate and maintain oscillation in an electrical oscillator, the output of the active element is typically fed back to the input of the active device through a feedback network, which produces a loop gain greater than 1. Feedback elements typically have narrowband characteristics. Furthermore, the oscillation frequency of the oscillator can be varied by electronically controlling the center frequency of the feedback element. [0003] The differential implementation is further illustrated in Figures 1a and 1b. To produce an oscillator with low phase noise, fast switching of one or more active devices is advantageous. Furthermore, the time relationship between the current injected into the resonant element by the active dev...

AI Technical Summary

Problems solved by technology

However, increased power consumption is undesirable and wider transistors will result in more parasitic capacitance, which resists fast switching

Images