Resistor string DAC with improved speed

Details Resistor string DAC with improved speed Resistor string DAC with improved speed

1998-12-22

2000-10-10

Phan, Trong

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341154, H03M 166, H03M 178

Patent

active

061306347

ABSTRACT:
The speed performance of a resistive DAC can be improved by tailoring the selection switch size to the node location. For the simple case of a DAC used in a SAR-based ADC, the MSB code, which is activated during each SAR search, is the speed-limiting bit. Increasing the size of the switch on the node corresponding to the MSB will reduce the on-resistance of the FET and, therefore, the total resistance to ground from the node. The on-resistance can be changed markedly without substantially changing the total capacitance at the output node, since the sum of the parasitic from the remaining switches will far exceed the additional capacitance created by increasing the MSB FET.

REFERENCES:
patent: 5175548 (1992-12-01), Kawada
patent: 5703588 (1997-12-01), Rivoir et al.
patent: 5969657 (1999-10-01), Dempsey et al.
patent: 5977898 (1999-11-01), Ling et al.
patent: 6049300 (2000-04-01), Shoval

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