Tag Archives: signal conditioner

Averager and Peak Hold/Extender Signal Conditioner

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A signal averager circuit can be formed by an amplifier and active signal rectifier, which is implemented using two operational amplifiers in this circuit. The first op-amp is configured as inverting amplifier and the second forms an active half-wave rectifier. The half cycle signal is then filtered by an RC… Read more »

Signal Conditioning Amplifier for Piezofilm Sensor

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The signal can be converted by piezoelectric films in many ways such as thermal to electrical (temperature sensor), mechanical to electrical (microphone), and electrical to mechanical ( a loudspeaker). The circuit is signal conditioning amplifier for piezofilm sensor which use three op amps and has a high-input-impedance differential charge. Here… Read more »

ECG Signal Conditioner

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High precision analog front end (signal conditioner) presented here can be used for portable ECG equipment that requires single-supply operation. There are two kind of amplifiers on the circuit diagram, the instrumentation amplifier INA326 and the dual precision amplifier OPA2335. Both operate from a single 5V supply and apply autozeroing… Read more »

Analog Multiplier

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The figure below shows a simple embodiment of the analog multiplier. This circuit provides three quadrant analog multiplication which is relatively temperature insensitive and which is not subject to the bias current errors which is plague most multipliers and circumvents many of the problems associated with the log-antilog circuit. By… Read more »

Frequency Doubler with 4011

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This is a circuit of Frequency Doubler using 4011. This circuit uses one CMOS quad, two input NAND gate package type 4011. This circuit consist of two differentiating networks R1/C1, R2/C2, an inverter IC1B and NAND gate IC1A, IC1D, IC1C and  function as input and output buffers. Figure below shows… Read more »

Power Function Circuit

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We can generate easily many non-linear functions such as X^1/2, X^2, X^3, 1/X, XY and X/Y using logs. Division becomes subtraction, multiplication becomes addition and powers become gain coefficients of log terms. The circuit diagram below shows a circuit whose output is the cube of the input. Actually, by changing… Read more »

Fast Logarithmic Amplifier

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This is Fast Logarithmic Amplifier circuit. Dynamic range of This circuit has is 80 dB. This circuit is configured to optimize speed rather than dynamic range. To allow the use of feed forward compensation1 on an LM101A operational amplifier, this circuit uses Transistor Q1 that is connected with diode. This… Read more »

Anti-Log Converter

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Anti-log or exponential generation is simply a matter of rearranging the logarithmic circuitry. The circuit diagram below shows the circuitry of the log converted to generate an exponential output from a linear input. The emitter of Q2 in proportion to the input voltage is driven by amplifier A1 in conjunction… Read more »