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# Logarithmic Amplifier Circuits

Algorithm Extracts Roots of Decimal Numbers: 04/29/99 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit

Log amp uses capacitor charging law: 01/10/2002  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 (VIN-VK) from 0V, when charged through a resistor, R, with an applied voltage of VIN, is VIN-VK=VIN (1-e-T/RC), where VK is a fixed voltage. .

Log Converters : National Semiconductor Application Notes,04-Nov-1995

Logarithmic Amplifier: Logarithmic amplifier uses the log characteristic of PN (diode, transistor) to implement logarithmic function. The second transistor is used as reference and with the PTK resistor minimizes the dT/dV coefficient.

Model Fixed Point DSP Arithmetic in C: 03/18/99 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit

PIC µC implements CRC16 Algorithm: 02/18/99 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit

Primer on Binary Arithmetic Rounding: 01/21/99 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit

Simple Algorithm Transforms Filter Coefficients: 01/21/99 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit

Single Stage gives Logarithmic Gain Steps : 03/03/94 EDN-Design 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, high-speed processing, or digital signal processing.

Software snippet provides improved subset sum algorithm : 09/25/03  EDN-Design Ideas / The subset-sum problem is one of the most frequently occurring NP (nondeterministic, polynomial-time)-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,24-Feb-1999