Logarithmic digital to analog converter having multipliers...

Details Logarithmic digital to analog converter having multipliers... Logarithmic digital to analog converter having multipliers...

2005-05-31

2005-05-31

Wamsley, Patrick (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Nonlinear

C341S144000

Reexamination Certificate

active

06900751

ABSTRACT:
An analog multiplier11raises a base reference voltage “Vref0” to the nth power so that a reference voltage “Vref1” is produced. Analog multipliers12and13sequentially raise the reference voltage “Vref1” to the nth power so that reference voltages “Vref2” and “Vref3” are produced. Switch groups38-41control the reference voltages “Vref0” to “Vref3”, which are then sent to an analog multiplier14together with an input voltage “Vin”. A comparator14sequentially compares a multiplication result “Vx” of the multiplier14with a voltage “Vout” outputted from a sensor circuit2, so that a digital output value “Dout” is produced. The analog multiplier14is set as appropriate.

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