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Quadrature Detector Circuits
 

Last Updated: November 29, 2017 05:39 AM


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

90 Degree Phase Shift: AF-UHF - Several Circuits, be sure to scroll down.  We've seen this 3 dB quadrature hybrid schematic in many ARRL articles for 7 MHz. __ Contact Vasily Ivanenko

Allpass Network Shifts Signals 90° - 04/27/95 EDN Design Ideas:  Unlike lowpass, bandpass, and other magnitude-altering filters, allpass filters can shift the phase of a signal without affecting its amplitude.  For a first-order allpass circuit, the transfer function is. __ Circuit Design by Gary Sellani, Maxim Integrated Products, Sunnyvale, CA

Circuit provides low-cost QAM mapping & translation - 09/27/07  EDN Design Ideas:  Using just two inverters for glue logic, an 8-bit microcontroller and two 12-bit DACs enable 256-level QAM __ Circuit Design by Pieter Demuytere, Cedric Mélange, Elena Matei, Els De Backer, Johan Bauwelinck, and Jan Vandewege, Ghent University, Department of Information Technology, Ghent, Belgium

Decode a Quadrature Encoder In Software - 01/20/11 EDN Design Ideas:  Use a microcontroller to decode signals without the need for a dedicated IC .   [Design ideas by Sid Levingston, Gentec-EO, Lake Oswego, OR __ Circuit Design by Sid Levingston, Gentec-EO, Lake Oswego, OR

Per-quadrant linear Amplifier distinguishes input polarity - 08/15/13  EDN Design Ideas:  in some applications, a linear amplifier is required which has different gains with regard to the polarity of the input signal.  Figure 1 shows an inverting amplifier which is linear within the second and fourth quadrants of the VOUT (ViN) plane, but the magnitude of its gain in the fourth quadrant is higher compared to the second. __ Circuit Design by Marian Stofka

Provides Low-Cost Qam Mapping & Translation - 09/27/07  EDN Design Ideas:  Using just two inverters for glue logic, an 8-bit microcontroller and two 12-bit DACs enable 256-level QAM __ Circuit Design by Pieter Demuytere, Cedric Mélange, Elena Matei, Els De Backer, Johan Bauwelinck, and Jan Vandewege, Ghent University, Department of Information Technology, Ghent, Belgium

Quadrature Detection - 08/17/12  EDN Design Ideas:  (Originally published in the August 22, 1985, EDN-Design ideas) A circuit generates an output voltage that you can measure to determine whether two sine waves have a quadrature relationship.  The circuit in Figure 1 generates an output voltage that you can measure to determine whether two sine waves have a quadrature relationship.  if the output voltage is 0V, the inputs (ϕ1 and ϕ2) are exactly in quadrature.  if the inputs are other than 90° out of phase, a dc voltage appears at the circuit’s output. __ Circuit Design by SL Black and HL Maddox, AT&T Technologies, Columbus, OH

Quadrature Multipath Monitor - When an FM signal propagates by more than one path, delayed replicas appear in the receive passband. The signals can interfere with each other and distort the recovered audio. Multipath distortion is nonharmonic, nonmusical, and can be very annoying. Rotating an outdoor antenna or repositioning an indoor one can lower the distortion by reducing antenna response to secondary paths __ Designed by Brian Beezley K6STI

Simple Circuit Suits Quadrature Detection - 08/17/12  EDN Design Ideas:  (Originally published in the August 22, 1985, EDN-Design ideas) A circuit generates an output voltage that you can measure to determine whether two sine waves have a quadrature relationship.  The circuit in Figure 1 generates an output voltage that you can measure to determine whether two sine waves have a quadrature relationship.  if the output voltage is 0V, the inputs (ϕ1 and ϕ2) are exactly in quadrature.  if the inputs are other than 90° out of phase, a dc voltage appears at the circuit’s output. __ Circuit Design by SL Black and HL Maddox, AT&T Technologies, Columbus, OH




Quadrature Detector Circuits


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