Algorithm Extracts Roots of Decimal Numbers: 04/29/99 EDNDesign
Ideas / PDF contains multiple circuits  scroll to find this
circuit 
Log amp uses capacitor charging law: 01/10/2002 EDN 
Design Ideas / The novel amplifier in Figure 1
relies on the exponential charging characteristics of a simple
RC circuit. The expression for the time, T, required for a
capacitor, C, to reach a voltage (VINVK) from 0V, when charged
through a resistor, R, with an applied voltage of VIN, is VINVK=VIN
(1eT/RC), where VK is a fixed voltage. . 
Log Converters : National Semiconductor Application
Notes,04Nov1995 
Logarithmic A/D Encoder: 
Logarithmic
Amplifier: Logarithmic amplifier uses the log caracteristic
of PN (diode, transistor) to implement logarithmic function. The
second transistor is used as refference and with the PTK
resistor minimizes the dT/dV coeficient. 
Model Fixed Point DSP Arithmetic in C: 03/18/99 EDNDesign
Ideas / PDF contains multiple circuits  scroll to find this
circuit

PIC µC implements CRC16 Algorithm: 02/18/99 EDNDesign Ideas
/ PDF contains multiple circuits  scroll to find this circuit 
Primer on Binary Arithmetic Rounding: 01/21/99 EDNDesign
Ideas / PDF contains multiple circuits  scroll to find this
circuit 
Simple Algorithm Transforms Filter Coefficients: 01/21/99
EDNDesign Ideas / PDF contains multiple circuits  scroll to
find this circuit 
Single Stage gives Logarithmic Gain Steps : 03/03/94 EDNDesign
Ideas / By placing a variable component in the positive feedback
loop of an op amp; you can vary the gain of the stage
logarithmically with respect to a linear resistance or
conductance 
Software Filter Boosts Signal Measurement Stability, Precision:
02/03/03 Electronic Design  Ideas for Design / Small or
embedded systems often require a delicate measurement in the
presence of high noise or interference. Without fancy filtering
hardware, highspeed processing, or digital signal processing,
it can be difficult to extract a stable signal of...

Software snippet provides improved subset sum algorithm :
09/25/03 EDNDesign Ideas / The subsetsum problem is one of
the most frequently occurring NP (nondeterministic,
polynomialtime)complete) problems. It asks whether a subset of
numbers in a set of positive integers adds up exactly to a given
value. A relaxed version of the problem tries to identify a
subset of numbers that adds up to a maximum value no greater
than a given value.... 
Theory & Applications of Logarithmic Amplifiers : National
Semiconductor Application Notes,24Feb1999 