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.
College and Department
Ira A. Fulton College of Engineering and Technology; Electrical and Computer Engineering
BYU ScholarsArchive Citation
Noall, Steve T., "A Wideband Precision Quadrature Phase Shifter" (2011). All Theses and Dissertations. 2773.
image rejection, quadrature generation, wideband, gain matching, low IF, 802.11a, Hartley method, RC-CR filter, frequency detection