Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Reexamination Certificate
2007-02-06
2007-02-06
Barnie, Rexford (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
C341S144000
Reexamination Certificate
active
11280905
ABSTRACT:
A digital-to-analogue converter (DAC) (1) comprises a digital processing circuit (2) having an input register (10) to which data samples of a digital input signal are written at a data sampling rate (fs). A delay register (14) holds each data sample for one clock cycle of the data sampling rate (fs), and a subtracting circuit (15) sequentially produces difference values between consecutive ones of the data samples by subtracting the data sample in the delay register (14) from the input register (12) on each clock cycle of the data sampling rate (fs). The difference values are sequentially converted to proportional analogue current signals by a current steering DAC circuit (3) which sequentially steers the proportional current signals for the duration of the respective clock cycles of the data sampling rate (fs) to a predominantly capacitive load impedance (4), which is coupled to ground8through a voltage reference source (5) and the voltage developed across the predominantly capacitive load impedance (4) with respect to ground (8) is a continuously linearly interpolated analogue voltage representative of the data sample of the digital input signal.
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Wang, Hong-wei, et al, “High speed digital-to-analog converter with linear interpolator”, IEEE Transactions on Consumer Electronics, vol. 46, No. 4, Nov. 2000, pp. 1137-1142.
Analog Devices Inc.
Barnie Rexford
Mai Lam T.
Wolf Greenfield & Sacks P.C.
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