Uniform Temperature Exposure No part of the log-amp circuit should be exposed to a temperature that is significantly different from any other part of the circuit.
Semiconductor manufacturers have since developed smaller andless costly integrated log-amp products with reduced temperature sensitivity and added functionality.
対数アンプの動作の全体的誤差を見積もる場合は、そのような誤差を含める必要があります。
Such errors should be includedwhen assessing the overall error budget of the log amp's operation.
A special version of the baseband log amp is the"true log amp," which accepts bipolar inputs and provides a compressed output voltage that preserves the polarity of the input.
As implied by the name, a logarithmic amplifier expresses an output that is related to its input by the mathematical log function the logarithmic base is not important, as the different log-based functions are related by constants.
Integrated DC Logarithmic Amplifiers- Maxim Keywords:log amps, logarithmic amplifiers, DC log amp, log amplifiers, logarithmic amps Related Parts Abstract: Among the classes of logarithmic amplifiers, the DC log amp continues to be a very powerful, cost-effective solution for compressing wide-dynamic-range sensor signals.
MAX4003 100MHz to 2500MHz, 45dB RF Detector in a UCSP- Maxim Description Create a design and simulate using EE-Sim® tools: The MAX4003 low-cost,low-power logarithmic amplifier is designed to detect the power levels of RF power amplifiers(PAs) operating from 100MHz to 2500MHz.
半世紀以上にわたって、エンジニアは信号圧縮と計算に対数アンプを使用してきました。
For over half a century, engineers have used log amps for compressing signals and for computation.
対数アンプは、ダイオード検出器に基づくコントローラよりも大幅に広い測定範囲と高い精度を提供します。
Logarithmic amplifiers provide much wider measurement range and superior accuracy to controllers based on diode detectors.
A typical dynamic range of 45dB makes this logarithmic amplifier useful in a variety of wireless applications including cellular handset PA control, TSSI for wireless terminal devices, and other transmitter power measurements.
Depending on the type of transistor chosen, npn or pnp, the log amp is either a current-sinking or current-sourcing circuit, respectively Figures 1a and 1b.
Excellent temperature stability is achieved over the fulloperating range of -40°C to +85°C. The MAX4003 logarithmic amplifier is a voltage-measuring device with a typical signal range of -58dBV to -13dBV.
These DC log amps operate on unipolar inputs(current or voltage), and are frequently referred to as diode, transdiode, translinear, and transimpedance log amps.
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