Lowe Hauptman & Ham, LLP
Auto frequency calibration for a phase locked loop and method of use
A phase locked loop includes a phase difference detector configured to receive a reference frequency and a divider frequency and output a phase difference signal. The phase locked loop includes a code generator configured to receive the reference frequency and the phase difference signal, and output a coarse tuning signal and a reset signal. The phase locked loop includes a digital loop filter configured to receive the phase difference signal and output a fine tuning signal. The phase locked loop includes a voltage control oscillator configured to receive the coarse and fine tuning signals, and output an output frequency. The phase locked loop includes a divider configured to receive the reset signal, a divider number control signal and the output frequency, and output the divider frequency. The phase locked loop includes a delta-sigma modulator configured to receive a divisor ratio and the reset signal, and output divider number control signal.
Taiwan Semiconductor Manufacturing Company, Ltd.
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Feng Wei Yen-Jen Huan-Neng Chewn-Pu
Kuo Chen Chen Jou