Questions tagged [quadrature]

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Offset QPSK Frame sync markers

What actual protocols exist out there that employ Offset Quadrature Phase-Shift Keying (OQPSK)? What do they use for the frame synchronization marker (or "preamble" or "sync word" or "flag")? Do ...
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Quadrature Encoder output overshoot

I have a Faulhaber 1717T006SR DC motor with a build-in quadrature encoder. Here is the relevant bit of the datasheet for the encoder. The encoder outputs are 5V. I want to interface this with an ...
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Quadrature encoder (unknown) pinout

I have a quadrature photoresistor from a printer. I want to determine the pinout. I can't find a datasheet for it. The case only shows "80058 - 96315" and I don't know the pinout. The two ...
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100 views

Driving Stepper Motor with Sine Wave

I am attempting to drive a stepper motor where each phase draws 1 A at 3.5 V using a sine wave oscillator that outputs two signals 90 degrees out of phase with one another. At the outputs of this ...
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125 views

How to find the RMS value of a sine wave with DC offset and retain the negative sign

I'm trying to build a Quadrature setup where an input signal is mixed with a reference signal that is in-phase and another one out-of-phase by 90deg. The idea is to extract the real and imaginary ...
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46 views

Output from a system of cascade connection with Wilkinson's divider and Quadrature hybrid

So I have this system, with \$f=3GHz\$ \$b = \frac{λ}{4}\$ \$a = 0<a<b\$ and I want to know the output at ports 2 and 3. I'm wondering how exactly I should approach it, and if my sketch is ...
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423 views

QAM Modulation Frequency vs Carrier Frequency

In QAM (Quadrature Amplitude Modulation) theory what is the relationship between the modulation frequency and the carrier frequency called? It is often stated in QAM tutorials that the carrier ...