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AssigneeWestern Digital Corporation
InventorsCharles R. Patton, III, George J. Bennett
Estimating the term…
A digital-to-analog converter (DAC) is preferably employed to receive a digital input word and provide an analog output signal to a motor driver in a disk drive servo. The digital input word has a plurality of bit positions for establishing a resolution for the DAC. These bit positions define first and second groups of bits. The DAC comprises circuitry responsive to the first group of bits for producing a pair of analog signals defining a common-mode magnitude and a differential magnitude. The common-mode magnitude is a function of the value of the first set of bits and the differential magnitude is a function of the number of bit positions in the first group of bits. In the DAC: a clock generates a clocking signal; a state machine has an input for receiving the clocking signal, an input for receiving the second groups of bits, and an output for providing a time-varying control signal; switching circuitry has a pair of inputs for receiving the pair of analog signals, an input for receiving the time-varying control signal, and an output for providing a pulse-width and amplitude modulated signal; and averaging circuitry responds to the pulse-width and amplitude modulated signal to producing the analog output signal.
A digital-to-analog converter (DAC) for converting a digital input word to an analog output signal, the digital input word having a plurality of bit positions for establishing a resolution for the DAC, the plurality of bit positions defining first and second groups of bits, the DAC comprising:
A digital-to-analog converter (DAC) for converting a digital input word to an analog output signal, the digital input word having a plurality of bit positions for establishing a resolution for the DAC, the plurality of bit positions defining first and second groups of bits, the DAC comprising:
Dependencies are inferred from the claim text.