Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Reexamination Certificate
2011-03-08
2011-03-08
Mai, Lam T (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
C331S009000
Reexamination Certificate
active
07903014
ABSTRACT:
A circuit and corresponding method are presented for generating an analog voltage from a digital input value is presented. An digital to analog conversion circuit, which is connected between a node and ground, receives an N-bit digital input value and generate from it a corresponding analog voltage. The node receives an input voltage provided by an op-amp connected to receive a reference voltage. The circuit also includes a variable resistance connected between the first node and ground in parallel with the digital to analog conversion circuit. The variable resistance is also connected to receive one or more of the digital input value and the value of the variable resistance is dependent upon the digital input values such that the combined current drawn from the first node by the variable resistance and the digital to analog conversion circuit is essentially constant during operation.
REFERENCES:
patent: 6198266 (2001-03-01), Mercer
patent: 6218822 (2001-04-01), MacQuigg
patent: 6329804 (2001-12-01), Mercer
patent: 7468215 (2008-12-01), Nielsen et al.
Davis Wrright Tremaine LLP
Mai Lam T
SanDisk Corporation
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