Oscillators with active higher-in-order phase shift filtering

Details Oscillators with active higher-in-order phase shift filtering Oscillators with active higher-in-order phase shift filtering

2006-05-30

2006-05-30

Le, Dinh T. (Department: 2816)

Oscillators

Phase shift type

C331S1070DP

Reexamination Certificate

active

07053723

ABSTRACT:
The present invention proposes a new way of improving the phase stability and frequency selectivity of a phase shift oscillator (100). By introducing a filter-order enhancing feedback loop (124) in association with a phase shift filter (122) in the oscillator, higher-order phase shift filtering can be achieved without using inductive elements as in conventional higher-order LC phase shift filters. This is a great advantage, since a high Q-value can be obtained without limited by the relatively high internal losses of inductive elements (L).

REFERENCES:
patent: 4891610 (1990-01-01), Veith
patent: 5859572 (1999-01-01), Hill
patent: 5874866 (1999-02-01), Satoh et al.
patent: 6727767 (2004-04-01), Takada

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