Sterne, Kessler, Goldstein & Fox P.L.L.C.
Hybrid phase lock loop
Hybrid phase lock loop (PLL) devices are provided that combine advantages of the digital controlled loop and the analog controlled loop. For example, a hybrid PLL includes a digital controlled loop that receives a reference input signal and an output signal of the hybrid PLL, and generates a digital tuning word. The hybrid PLL further includes an analog controlled loop that receives the reference input signal and the output signal of the hybrid PLL, and generates an output voltage. The hybrid PLL also includes a hybrid oscillator. An oscillator controller of the digital controlled loop controls the hybrid oscillator using the digital tuning word and disables the analog controlled loop during a frequency tracking operation mode of the hybrid PLL. The oscillator controller enables the analog controlled loop to control the hybrid oscillator during the phase tracking operation mode of the hybrid PLL.
Taiwan Semiconductor Manufacturing Co., Ltd.
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Tsung-Hsien Cheng-Hsiang Chih-Hsien Ruey-Bin
Tsai Hsieh Chang Sheen