Algorithm Extracts Roots of Decimal Numbers: EDNDesign Ideas / PDF contains multiple circuits  scroll to find this circuit 
Log amp uses capacitor charging law: EDN  Design Ideas / The novel logarithmic 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: 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 