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Quadrature Detector Circuit - Circuit Design
https://www.fishercom.xyz/circuit-design/info-bnv.html
(2) the structure of the circuit is suitable for realization in integrated circuit form, (3) the time-constant R3 C3 is chosen to "follow'' the changes in the amplitude of the audio-frequency signal, (4) when the two signals are 90° out of phase (in quadrature), Q2 and Q3 conduct equal currents and this condition may be used as a datum.
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/
The circuit is very simple – it just takes a double rate clock and switches one output on the rising edge, and one of the falling edge. The result is two outputs that are in quadrature with each other. It is implemented with two D flip-flops with the inverted signal connected to the input (also called a T flip flop). Here is the basic circuit:
Phasing Quadrature Amplification - Radio World
https://www.radioworld.com/tech-and-gear/phasing-quadrature-amplification
With Class I, there are two in-phase PWM carriers that are connected to a common clock, using a differential process where one input is offset to the other by 180°. This means the audio input needs to be phase-shifted by 0° and 180° to drive each PWM input. Both classes of amplification, therefore, are linear.
US20080166978A1 - Method and circuit for estimating in ...
https://patents.google.com/patent/US20080166978A1/en
Each of the in-phase (J) and quadrature phase (Q) signals paths 120i and 120q comprise a mixer 125i and 125q respectively. Each mixer 125i, 125q is coupled to a respective analog-to-digital...
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