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== Signal Generators == | == Signal Generators == | ||
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*[http://www.twysted-pair.com/forum/viewtopic.php?id=107 Signal (and other) Generators] | *[http://www.twysted-pair.com/forum/viewtopic.php?id=107 Signal (and other) Generators] | ||
*[http://www.tek.com/Measurement/programs/301889X312609/ XYZs of Signal Generators] PDF | *[http://www.tek.com/Measurement/programs/301889X312609/ XYZs of Signal Generators] PDF | ||
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* In principle, a [[Music Player]] can be used as a signal generator. | * In principle, a [[Music Player]] can be used as a signal generator. | ||
Traditionally, there have been 4 classes of signal generators: | Traditionally, there have been 4 classes of signal generators: | ||
* very simple signal generators based on 555 timer chips, generating square waves or "rectangle waves" with adjustable frequency or duty cycle or both. | * very simple signal generators based on 555 timer chips, generating square waves or "rectangle waves" with adjustable frequency or duty cycle or both. | ||
− | * slightly more complex "analog" triangle, sine, square generators, often with an analog input that is used to modulate the output duty cycle (PWM), frequency (FM), amplitude (AM), or phase (PM). A special case is DTMF generators. Alas, many of the ICs used historically to build such "analog" signal generators and DTMF generators are no longer being manufactured | + | * slightly more complex "analog" triangle, sine, square generators, often with an analog input that is used to modulate the output duty cycle (PWM), frequency (FM), amplitude (AM), or phase (PM). A special case is DTMF generators. Alas, many of the ICs used historically to build such "analog" signal generators and DTMF generators are no longer being manufactured. |
* high-precision analog sinewave generators ([[OpAmp Links]] mentions a few) | * high-precision analog sinewave generators ([[OpAmp Links]] mentions a few) | ||
* direct digital synthesis (DDS) arbitrary waveform generators, typically using a crystal oscillator reference frequency, processor, Flash program memory, RAM waveform memory, DAC, etc. A few processors have an internal DAC that can directly output DTMF analog waveforms -- such as the Cypress PSoC CY8C27143 and CY8C29466, the Atmel AVR ATXMEGA32A4, the ST STM32F100 series, the Jennic JN5148, the NXP LPC2131, etc. Applications requiring more than 12 bit precision typically require an external DAC. | * direct digital synthesis (DDS) arbitrary waveform generators, typically using a crystal oscillator reference frequency, processor, Flash program memory, RAM waveform memory, DAC, etc. A few processors have an internal DAC that can directly output DTMF analog waveforms -- such as the Cypress PSoC CY8C27143 and CY8C29466, the Atmel AVR ATXMEGA32A4, the ST STM32F100 series, the Jennic JN5148, the NXP LPC2131, etc. Applications requiring more than 12 bit precision typically require an external DAC. |