Signal generator, electronic system comprising the signal generator and method of generating signals
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United States of America Patent
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Jan 19, 2016
Grant Date -
Jun 25, 2015
app pub date -
Jan 13, 2014
filing date -
Dec 24, 2013
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Abstract
A quadrature phase signal generator comprises a relative delay unit, a phase detector, a first amplifier and a loop filter. The relative delay unit delays differential input signals and generates four delayed signals. The phase detector generates quadrature four phase output signals, a first voltage signal and a second voltage signal according to the four delayed signals. A difference of the first and the second voltage signals indicates a phase error of the quadrature four phase output signals. The first amplifier amplifies the voltage difference of the first and the second voltage signals. The loop filter filters the amplified voltage difference and generates a tuning voltage signal. The loop filter is further communicatively coupled to the relative delay unit. The relative delay unit adjusts a delay of the quadrature four phase delayed signals according to the tuning voltage signal.
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