Continuous-time integrating filter with minimum phase...

Details Continuous-time integrating filter with minimum phase... Continuous-time integrating filter with minimum phase...

2006-11-14

2006-11-14

Young, Brian (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

Reexamination Certificate

active

07136001

ABSTRACT:
The disclosure pertains to continuous-time filtering. More particularly, it relates to filtering in a feedback control loop, for example in a sigma-delta (ΣΔ) modulator. The making of a filter for this type of application comes up against a major problem linked to the relativity between the amplitude and phase responses. This limits the possibilities of choice in order to take steps against the instability of the loop. A continuous-time filter with minimum phase variation carries out the bandpass integration of the signal presented at its input. The making of the continuous-time filter as a bandpass integrator raises the problem of achieving a compromise between gain variations and phase variations close to the −1 critical point, This compromise must lead to the stability of the loop. This problem is resolved by using a continuous-time bandpass integrating filter comprising at least one resonance device with minimum phase variation.

REFERENCES:
patent: 4395904 (1983-08-01), Ivanov et al.
patent: 4467291 (1984-08-01), Roza
patent: 5136651 (1992-08-01), Cooper et al.
patent: 27 57 460 (1978-06-01), None
patent: 35 04 383 (1986-08-01), None

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