Digital-to-analog converter having high resolution and high band

Details Digital-to-analog converter having high resolution and high band Digital-to-analog converter having high resolution and high band

1998-10-14

2000-04-18

Young, Brian

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

375238, 341152, H03M 166

Patent

active

060520760

ABSTRACT:
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.

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