H-bridge common-mode noise reduction circuit

Details H-bridge common-mode noise reduction circuit H-bridge common-mode noise reduction circuit

2005-03-15

2005-03-15

Jeanglaude, Jean Bruner (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

Reexamination Certificate

active

06867722

ABSTRACT:
A common-mode noise reduction circuit (20) adapted to receive a DIN input (−1, 0, +1), such as from a sigma-delta modulator (12), and provide alternating outputs (DoutP, DoutM) such as to reduce the common-mode noise of an H-bridge (14). A zero detect circuit (26), a pattern generator (28) and a level generator circuit (24) provide that the outputs DoutP and DoutM are either both logic 1 or both logic 0, such as to lower the common-mode noise level by a device, such as a H-bridge (14). This circuitry (20) places a zero in the transfer function of the H-bridge (14) to reduce the common-mode noise, whereby high pass filters shape the noise out-of-band in an over sampled system.

REFERENCES:
patent: WO 03047309 (2003-06-01), None

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