A Wideband Precision Quadrature Phase Shifter

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Brigham Young University - Provo

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https://scholarsarchive.byu.edu/etd/2773; https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=3772&context=etd
Noall, Steve T.
Brigham Young University - Provo
image rejection; quadrature generation; wideband; gain matching; low IF; 802.11a; Hartley method; RC-CR filter; frequency detection; Electrical and Computer Engineering
thesis / dissertation description
A new circuit is proposed that uses an RC-CR filter in a feedback configuration to achieve a wideband precision quadrature phase shift with constant amplitude response. Such a circuit can be used to perform image rejection in a low IF receiver using the Hartley method. Simulation results show that the circuit can achieve an average image rejection ratio of 50 dB over a 16 MHz bandwidth. The feedback loop enables the circuit to maintain high accuracy over process and temperature.