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Quadrature phase shifter for audio frequency sinewaves ...
https://iopscience.iop.org/article/10.1088/0957-0233/8/6/015
A quadrature phase shifter for sinusoidal signals is presented. The circuit provides phase delay (within ) and unity gain (within 6%) in the frequency range 100 Hz to 10 kHz. It consists of a second-order lowpass current-controlled filter; the cutoff frequency is mantained equal to the input frequency with a frequency to current converter.
Top 7 Ways to Create a Quadrature (90˚) Phase Shift ...
https://www.markimicrowave.com/blog/top-7-ways-to-create-a-quadrature-90-phase-shift/
3 dB Quadrature Hybrid Coupler. Pro: Multi-octave bandwidth, amplitude and phase balance, …
DESIGN NOTE: Quadrature phase shifter for audio frequency ...
https://ui.adsabs.harvard.edu/abs/1997MeScT...8..673C/abstract
A quadrature phase shifter for sinusoidal signals is presented. The circuit provides 0957-0233/8/6/015/img1 phase delay (within 0957-0233/8/6/015/img2) and unity gain (within 6%) in the frequency range 100 Hz to 10 kHz.
A Wideband Precision Quadrature Phase Shifter
https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=3772&context=etd
precise quadrature phase shift with constant amplitude response in order to achieve a high image rejection ratio (IRR). An RC-CR lter is a popular method of performing the phase shift over a small bandwidth. RC-CR lters have a phase shift of 90 at all frequencies, but can only achieve reasonably constant amplitude response over a narrow bandwidth.
Audio Polyphase Quadrature Phase Shift Network | QRZ Forums
https://forums.qrz.com/index.php?threads/audio-polyphase-quadrature-phase-shift-network.228425/
9H1FQ Ham Member QRZ Page. Hi all, We have lots of resources and circuit ideas about the polyphase quadrature audio phase shift network, like HA5WH, Weaver, Gingell Tayloe etc. But which is the ideal ? Which is the one that gives the best sideband rejection ? Which is the most used ? Like to hear from anyone who has built one. 9H1FQ, Dec 8, 2009.
Phasing Quadrature Amplification - Radio World
https://www.radioworld.com/tech-and-gear/phasing-quadrature-amplification
With quadrature amplification, it is an ultralinear process, where most of the distortion takes place in the phase modulator stages (converting the analog inputs to PPM or PWM). With ongoing improvements, I am sure it is possible to bring this level of distortion down, closer to 0.5% at 100% modulation.
Frequency Shifter For Acoustic Feedback Reduction
https://www.sound-au.com/project204.htm
There are two multipliers required, with the two signals into each (audio and low frequency oscillator - LFO) each shifted by 90°. This is called a quadrature signal (for both the incoming audio and the LFO). The oscillator shows a sine and a cosine output - a cosine wave is a sinewave, but shifted by 90°.
That 90 Degree Phase Shift - Electronics Infoline ...
https://electronicsinfoline.com/pin/39135/
Quadrature detectors with digital signal processing don’t excite me either, however, that may change over time. ... To start with, I designed and built a simple, low bandwidth, add-on 90º phase shifter for my 1 KHz bench audio signal generators: Above — The schematic for my 1 KHz 90º phase shifter. The 10 nF capacitors were 1% tolerance ...
Lecture 9 Analog and Digital I/Q Modulation
https://web.mit.edu/6.02/www/f2006/handouts/Lec9.pdf
phase alignment with transmitter local oscillator – We have two orthogonal transmission channels (I and Q) available to us – Transmit two independent baseband signals (I and Q) with two sine waves in quadrature at transmitter Transmitter Output f-f o 0 f o 11 f 0 f-f 1 f 1 0 j-j 2cos(2πf 2t) 2sin(2πf 2t) y(t) i t(t) q t(t) I t(f) Q t(f) f 0 f-f o 0 f o 1 11 1 f-f o f o j-j Y i(f) Y q(f)
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