Oversampling D/A converter using a bidirectional shift register

Details Oversampling D/A converter using a bidirectional shift register Oversampling D/A converter using a bidirectional shift register

1995-07-31

1997-12-16

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341 77, 341143, H03M 178

Patent

active

056990642

ABSTRACT:
In an interpolative modulator, a signal which varies by only .+-.1 with one clock from a 1-bit quantizer is used as a shift-direction control signal. The shift-direction control signal is given to a bidirectional shift register. The bidirectional shift register shifts data based on the value of the shift-direction control signal that has been received. The output from the bidirectional shift register is given as a control signal to a resistive-ladder-type D/A converter. The resistive-ladder-type D/A converter outputs an analog potential corresponding to a switch selected by the above control signal. Therefore, if a delay difference occurs between any two bits, two adjacent switches are simply selected simultaneously, so that the output from the resistive-ladder-type D/A converter varies continuously. Consequently, there can be provided an oversampling D/A converter of resistive-ladder type with high accuracy and an increased yield, which is free from glitch (transiently generated noise).

REFERENCES:
patent: 3925731 (1975-12-01), Brainard et al.
patent: 4122442 (1978-10-01), Henry

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