Archive for the ‘Data Communication’ Category
Infinite Resolution Frequency Multiplier/Divider
Normally, frequency multiplier or divider has only discrete ratio operation since it uses digital divider as the main process for division or multiplication. By first converting the incoming frequency into a proportional DC voltage, we can perform frequency scaling easily with no restriction of discrete ratio operation. Here is the block diagram the scheme: We …[Read More]
Pulse Delay Generator
This circuit is a Delayed Pulse Generator that is used to provide pulse rate and independent control of initial delay. The pulse generator of this circuit is IC1c which the operation is depended on the normally low O/P of the IC1a. The PB1 is used to make the circuit input goes low. When PB1 is …[Read More]
If the sensor system need an active supply, we can use only a single pair of cable to carry both the power supply and the output signal. Not only simplify the wiring, converting analog voltage level to frequency modulated pulse improve the noise immunity as well. Here is the schematic diagram of the system: The …[Read More]
Superlinear FM (Frequency Modulator)
Designing various electronic circuit system (synthesizer, modem, decoder, data converter, etc) of ten need a frequency modulator subsystem. An FM modulator is very easy to build with TC9400 since the it has very good linearity as V/F converter. Here is the system’s block diagram: While Vin determines the amount of modulation (FM deviation) around the …[Read More]
Frequency Shift Keying (FSK) Encoding and Decoding
The meaning of Frequency Shift Keying (FSK) is transmitting digital data over a signal path (two wires, telephone lines, AM or FM transmitter). Typically, there are only two signals transmitted. One corresponds to a logical “1″. the other to a logical “1″. These two frequency will be generated by a TC9400 V/F converter when connected …[Read More]
DC Response Analog Data Recording using Audio System
If we want to record very low frequency or DC signal on an audio recording system, we have to convert the DC/low frequency signal into the spectrum of audible sound. The figure of DC response data recording system is shown below. We can record low-frequency analog data (DC to 10kHz) anywhere, store, and then reproduced. …[Read More]
High Noise Immunity for Data Transmission with VFC
It is advantageous to convert the analog signal into a digital signal, which is less susceptible to noise pick-up when transmitting analog data over long distances. It is very easy for noise to interfere the amplitude of a signal, but it would be harder to change its frequency. The TC9400 converts the input voltage into …[Read More]
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