Tuning-Range Enhancement Through Deterministic Mode Selection in RF Quadrature Oscillators

Bagheri, Mahdi; Bagheri, R.; Buckwalter, James F.; Larson, L.E.

doi:10.1109/tmtt.2015.2478787

Cited by 3 publications

(1 citation statement)

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“…Then the digital quadrature signal generator is used to generate orthogonal signals [3][4][5][6], but the phase error of the signal is not adjustable and compensated. In the previous study [7], the quadrature phase error caused by the mismatch of the capacitor is very large, and this phenomenon is more serious with the increase of the frequency. The more important problem is that the implemented integrated circuit is able to generate orthogonal signals, and the phase difference of the orthogonal signal is exactly 90 degrees in the early simulation stage.…”

Section: Introductionmentioning

confidence: 91%

A Four Quadrature Signals’ Generator with Precise Phase Adjustment

Wang

et al. 2016

Journal of Electrical and Computer Engineering

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A four-way quadrature signals generator with precise phase modulation is presented. It consists of a phase precision regulator and a frequency divider. The phase precision regulator generates two programmable currents by controlling the conduction of the tail current sources and then changes the currents into two bias voltages which are superimposed on the clock signals to adjust the phase difference of the four quadrature signals generated by the frequency divider, making the phase difference of 90 degrees. The four quadrature signals’ generator with precise phase modulation has been implemented in a 0.18 μm mixed-signal and RF 1P6M CMOS technology. The size of the chip including the pads is675 μm⁎690 μm. The circuit uses a supply voltage of 1.8 V, a bias current of 7.2 μA, and the bits of phase-setting input leveln=6in the design. The measured results of the four orthogonal signals’ phase error can reach ±0.1°, and the phase modulation range can reach ±3.6°.

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Section: Introductionmentioning

confidence: 91%