Logarithmic amplifier ic
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Logarithmic amplifier ic
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Content:
- Log And Anti Log Amplifiers
- Product Family: Logarithmic Amplifier
- Log amplifier
- Logarithmic Amplifiers 25012.7Gbps Limiting Amplifier.I.C. (10 p
- 50 шт./лот AD8307AR AD8307ARZ AD8307A SOP-8 8307A логарифмический усилитель IC
- logarithmic amplifier ic
- US4990803A - Logarithmic amplifier - Google Patents
Log And Anti Log Amplifiers
Log amplifier is a linear circuit in which the output voltage will be a constant times the natural logarithm of the input. Log amplifier finds a lot of application in electronic fields like multiplication or division they can be performed by the addition and subtraction of the logs of the operand , signal processing, computerised process control, compression, decompression, RMS value detection etc.
Basically there are two log amp configurations: Opamp-diode log amplifier and Opamp-transistor log. The schematic of a simple Opamp-diode log amplifier is shown above. This is nothing but an opamp wired in closed loop inverting configuration with a diode in the feedback path. The voltage across the diode will be always proportional to the log of the current through it and when a diode is placed in the feedback path of an opamp in inverting mode, the output voltage will be proportional to the negative log of the input current.
Since the input current is proportional to the input voltage, we can say that the output voltage will be proportional to the negative log of the input voltage. Since an ideal opamp has infinite input resistance, the input current Ir has only one path, that is through the diode. That means the input current is equal to the diode current Id. Considering that the negative of the voltage across diode is the output voltage Vout see the circuit diagram fig1 , we can rearrange the equation 5 to get.
In this configuration a transistor is placed in the feedback path of an opamp wired in inverting mode. Collector of the transistor is connected to the inverting input of the opamp, emitter to output and base is grounded. The necessary condition for a log amp to work is that the input voltage must be always positive. Circuit diagram of an Opamp-transistor log amplifier is shown below.
I feel the input voltage should be always negative, not positive. Please help me clarify this. Thank you. Do you have an idea of how strong this dependence will be? Does the formula change if I add a resistor just before the ground on the diode drawing. Well, any diode with normal thermal characteristics suffices.
The Thermal Voltage for a standard diode comes to 26mV at room temperature of 30 degC. Author admin. Cascode amplifier March 13, Stereo headphone amplifier February 16, Transistor amplifier July 26, Hari 3 years ago. Purpose of hysteresis in a comparator? How current characteristics of pn junction employed in a log amplifier? R Va 4 years ago. What would happen if the input voltage is negative? On both cases. Hailv 4 years ago. Why use it for mearsurement light?
Saroj Chaudhari 4 years ago. Can you please tell me the limitations of basic log amplifier? Juan Lizarazo 5 years ago. How to convet the one value into log value. Bindu 5 years ago. PN junction diode is used. T-Tech 6 years ago. Excuse me but how can a NPN transistor work when base is grounded?
Mukesht 6 years ago. Because the transistor is in the common base configuration. Arjun Shrestha 8 years ago. Please make me clear about the final equation in diode model.. Thank you.. Jaco 7 years ago. Fady Mourad 9 years ago. Submit Type above and press Enter to search. Press Esc to cancel.
Product Family: Logarithmic Amplifier
Jul 23 It employs the progressive compression technique over a cascaded amplifier chain, each stage of which is equipped with a detector cell. The device can be used in either measurement or controller modes. The device provides unprecedented logarithmic intercept stability vs. A supply of 3. The AD can be configured to provide a control voltage to a power amplifier or a measurement output from the VOUT pin.
Log amplifier
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Logarithmic Amplifiers 25012.7Gbps Limiting Amplifier.I.C. (10 p
In this tutorial, we will learn about different Applications of Operational Amplifiers. Op-Amps are one of the basic analog circuits that have a wide range of implementations. We will learn some of the important but more commonly used Operational Amplifier Application in this post. A comparator, in electronics, is a circuit configuration that compares two voltages or currents and indicates which one is larger.
50 шт./лот AD8307AR AD8307ARZ AD8307A SOP-8 8307A логарифмический усилитель IC
Why do the circuit designers solve difficult maths question if there is no usage? May you be wrong. Yes, we are discussing the logarithmic amplifier, which is also known as the log amplifier. A log amplifier is a circuit that generates the output which is proportional to the logarithm of the applied input. In other words, the output voltage of the circuit is the k times of the natural logarithm of the applied input voltage. Opam is the central element of the circuit.
logarithmic amplifier ic
Effective date : Year of fee payment : 4. Year of fee payment : 8. Year of fee payment : A multi-stage logarithmic converter of the "successive-detection" or "progressive-compression" type including circuitry providing an accurate, temperature-stabilized logarithmic transfer function. The gain stages are DC-coupled throughout, though each also employs a demodulator comprising a full-wave rectifier, allowing operation in both baseband and demodulating modes.
US4990803A - Logarithmic amplifier - Google Patents
A log amplifier is an amplifier for which the output voltage V out is K times the natural log of the input voltage V in. This can be expressed as,. The logarithm amplifier gives an output voltage which is proportional to the logarithm of applied input voltage.
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Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. DOI: APEC ' A new logarithmic amplifier suitable for integration in controller IC's for power electronics systems is introduced. The amplifier can be implemented in standard BiCMOS technologies commonly used to manufacture controller IC's but consumes little silicon real estate as compared to commercial log amplifiers, leaving room for primary controller features. Particularly suitable to high voltage measurements at low power, the amplifier includes internal temperature compensation.
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