Low power method and interface for generating analog waveforms

Details Low power method and interface for generating analog waveforms Low power method and interface for generating analog waveforms

2006-06-06

2006-06-06

Wamsley, Patrick (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

C327S130000, C375S272000

Reexamination Certificate

active

07057543

ABSTRACT:
A low power analog output circuit is disclosed that utilizes a low pass filter driven by a bit stream to render a waveshaped output signal based upon a raw digital data signal. The analog output circuit includes sequential bit pattern selection logic that receives as an input, the raw digital data signal. The analog output circuit also includes a bit pattern storage that specifies bit stream sequences that are selected in accordance with control signals generated by the state machine based upon its current state and the current raw digital data signal. The analog output circuit includes an output stage driven by a digital input signal corresponding to values provided by a bit stream sequence selected from the bit pattern storage. The output stage comprises a low pass filter circuit having an effective time constant that is greater than a hold period associated with a single bit of the bit stream sequence that drives the digital input signal.

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