Code-controlled voltage divider

Details Code-controlled voltage divider Code-controlled voltage divider

2005-08-30

2005-08-30

Jeanglaude, Jean Bruner (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

C341S144000

Reexamination Certificate

active

06937180

ABSTRACT:
A code-controlled voltage divider (20) is disclosed. The voltage divider (20) includes an upper portion with a resistor (22) and a dummy switching transistors (23), which is biased to be in an on-state. A lower portion of the voltage divider (20) includes multiple parallel legs, each including a resistor (24) and a corresponding switching transistor (26) that has its gate receiving one bit of a digital control word. A decoder (30) may be provided within the voltage divider (20) to generate the digital control word from an incoming code word, for example from a central processing unit (10). The lower portion resistors (24) of the voltage divider (20) are binary-weighted, and the sizes of the corresponding switching transistors (26) are binary-weighted so that the portion of the series resistance of each parallel leg that is due to the on-resistance of the switching transistor (26) is substantially constant over all of the parallel legs. The upper resistor (22) has a resistance that is related to one of the resistors (24) in the lower portion, and the size of the dummy switching transistor (23) is similarly related to the switching transistor (26) to that resistor's switching resistor (24).

REFERENCES:
patent: 6222474 (2001-04-01), Fattaruso et al.
patent: 6329860 (2001-12-01), Komatsu
patent: 6369736 (2002-04-01), Tran et al.
LTC 1706-82 VID Voltage Programmer for Intel VRM9.0/9.1 Datasheet (Linear Technology Corporation, 2000).

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