Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Patent
1997-03-20
1998-09-29
Young, Brian K.
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
H03M 166
Patent
active
058151044
ABSTRACT:
A method and apparatus for converting a digital signal into an analog signal with minimal self generated noise is achieved by a digital to analog converter that includes a current source, a switch circuit, and a gating circuit. The current source provides a current, which is representative of digital data, to the switch circuit. The switch circuit, based on control signals provided by the gating circuit, routes the current to an analog node and/or a reference potential node. The control signals cause the switch circuit to route the current to both nodes when a clock pulse signal is in a first state regardless of the state of the data, to route the current to the analog node when the clock pulse signal is in a second state and digital data is in a second state, and to route the current to the reference potential node when the clock pulse signal is in the second state and the digital data is in a first state. In this manner, an analog representation of the digital data is present at the analog node.
REFERENCES:
patent: 5592165 (1997-01-01), Jackson et al.
patent: 5602552 (1997-02-01), Hirose et al.
Jackson H. Spence
Margules Michael A.
Markison Timothy W.
Sigmatel, Inc.
Young Brian K.
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