Current Oscillator/Demodulator

• Model of Focus: • Series 1000

Oscillator/Demodulator

• Design• Hardware oscillator circuit• Hardware demodulation circuit

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Current Oscillator/Demodulator

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Oscillator-Voltage Regulator• Three parts to oscillator: voltage regulator, oscillator, and

amplifier.• The voltage regulator takes input voltages of 11.5 to 30

VDC and holds it at a near constant value (about 12 V).• Output to voltage regulator will be used to power the

amplifiers through the circuit as being used as a voltage input.

• Second part is the oscillator itself.• Hardware circuit that converts a

DC signal to an AC signal. • Frequency of the oscillator is

determined by a RC combination, looking for a range of 1.5 to 12.5 kHz.

• Output voltage should be 1 VRMS.• Need to make an oscillator with

almost no harmonic distortion. http://www.electronics-tutorials.ws/oscillator/osc22.gif

Oscillator

Oscillator-Amplifier• Third subpart is the amplifier.• Will take the output signal of the Oscillator portion and

amplify the wave form.• Output voltage determined by a resistor, looking for 1 to 6

VRMS.

Oscillator Design Choices-DSP

• Advantage:• Reduction in parts needed

• No amplifier• No analog circuit components required

• Disadvantage:• Distortion in waveform due to sampling• Programing issues• Stability concerns

Oscillator Design Choices-Build from Scratch

• Advantage:• Will know circuit completely upon completion• Can be designed to specifically fit project specifications

• Disadvantages:• Time consuming• Lots of troubleshooting• Stability issues