Differential current-steering digital-to-analog converter

Details Differential current-steering digital-to-analog converter Differential current-steering digital-to-analog converter

2008-05-06

2008-05-06

JeanPierre, Peguy (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

C341S144000

Reexamination Certificate

active

11519201

ABSTRACT:
Differential, current-steering DACs with reduced small signal differential non-linearity. A set of binary-weighted steerable constant current generators is used in which each constant current generator comprises a ternary constant current generator configured to generate a three-state differential current in response to a ternary signal on a control input. Each ternary current generator is associated with a bit of the binary code. The DAC further comprises a code converter coupled between a digital input, to receive a signed digital value for conversion, and control inputs of the steerable current generators, to convert the binary input code to a ternary code to control the steerable current generators to provide a differential analogue output. In embodiments the smallest current source is ½I0where I0is a change in differential output current caused by an lsb change in the binary input code.

REFERENCES:
patent: 4683458 (1987-07-01), Hallgren
patent: 5841384 (1998-11-01), Herman et al.
patent: 6507304 (2003-01-01), Lorenz
patent: 6853323 (2005-02-01), Chen et al.
patent: 7030799 (2006-04-01), Lee et al.
International Search Report Form PCT/ISA/206, PCT/GB2007/050217.

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