An 8-Bit Digitally Controlled Programmable Phase Shifter Circuit for Sinusoidal Signals with 252 ∘ Phase Control Range
First Online: 11 August 2012 Received: 01 December 2011 Revised: 17 July 2012 DOI:
Cite this article as: Sánchez Gaspariano, L.A., Gómez, C.I.M., Pérez, J.M.R. et al. Circuits Syst Signal Process (2013) 32: 415. doi:10.1007/s00034-012-9466-2 Abstract
In this paper, the synthesis, design, and implementation of a programmable phase shifter circuit for sinusoidal signals is presented. The proposed circuit, built-up herein with operational amplifiers (OPAMPs), high precision resistors and low voltage switches, consists of a digitally controlled amplitude attenuator in combination with a single-tone orthogonalizer. Experimental results agree with theoretical background: the attained phase range was 252
∘ in 256 steps with a median step of 0.9 ∘. The inaccuracy of the circuit was determined to be of 0.03 %. Contrary to other OPAMP approaches for sinusoidal signals reported in the literature and based on a first-order all-pass filter structure, the approximation suggested in this work is based on a different concept. The achieved results demonstrate the functionality of the system for the case of a sinusoidal signal with frequency of 1 kHz. Notwithstanding, the proposed architecture can be extended to operate at higher frequencies by using different building blocks with larger bandwidth. Furthermore, it can be extended as well to work out with other periodic input waveforms, like triangular shapes or square waves, with the use of an appropriate orthogonalizer. Keywords Phase shifter circuit Vector projection Programmable amplitude attenuator Analog orthogonalizer References
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