Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Patent
1995-09-05
1997-04-29
Young, Brian K.
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
H03M 166
Patent
active
056253605
ABSTRACT:
A switchable current source (41) for a Digital to Analog Converter (DAC) to reduce noise glitches when a change in total current provided by the DAC occurs. The switchable current source (41) is one of many required by a DAC to convert a digital signal to an analog signal. Each current source of the DAC receives an input voltage that enables or disables the current source from providing or not providing a current. A sampled input voltage is alternately provided to the switchable current source (41) by a first flip flop (42) or a second flip flop (43). One flip flop samples the input voltage while the other provides a previous sampled input voltage for enabling and disabling the switchable current source (41). Switches (46,47) couple an output voltage of the first or second flip flops (42,43) a predetermined time after the output voltage changes to a transistor (51) coupled to a current source (53).
REFERENCES:
patent: 4422176 (1983-12-01), Summers
"A 16-b D/A Converter with Increased Spurious Free Dynamic Range", IEEE Journal of Solid-State Circuits, vol. 29, No. 10, Oct. 1994.
Garrity Douglas A.
Rakers Patrick L.
Coleman Sharon K.
Hoshizaki Gary W.
Motorola Inc.
Young Brian K.
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