Loop filter for class D amplifiers

Details Loop filter for class D amplifiers Loop filter for class D amplifiers

2006-02-21

2006-02-21

Choe, Henry (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

C330S251000

Reexamination Certificate

active

07002406

ABSTRACT:
A class-D amplifier circuit (30; 30′) providing improved open-loop error for base-band frequencies, such as the audio band, is disclosed. The amplifier circuit (30; 30′) includes a comparator (35) for generating a pulse-width-modulated output signal that is applied to an output power stage (37). An LC filter (32) is at the output of the power stage (37). The amplifier circuit (30; 30′) includes a loop filter having multiple feedback loop paths, with at least one feedback loop path coupled to the output of the power stage (37), and optionally, at least one feedback loop path coupled to the output of the LC filter (32). The transfer function (Hmae(s)) of the loop filter has a real part that has a much steeper slope (on the order of 80 dB/decade) at frequencies above the pulse-width-modulation switching frequency than the slope of its magnitude characteristic at frequencies below this switching frequency.

REFERENCES:
patent: 5805020 (1998-09-01), Danz et al.
patent: 6016075 (2000-01-01), Hamo
patent: 6232833 (2001-05-01), Pullen
patent: WO 98/19391 (1998-05-01), None
Berkhout “Integrated Class D Amplifier”, presented at the 112th Conventional of the Audio Engineering Society (May 10-13, 2002; Munich).

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