| 发明名称 | Digitally controlled oscillator and digital PLL including the same | ||
| 摘要 | A digitally controlled oscillator has a high-order ΔΣ modulator configured to be of at least an order higher than a first order and configured to input a digital control signal and output a pseudorandom digital output signal, a first-order ΔΣ modulator configured to input the pseudorandom digital output signal and generate a control pulse signal including a pulse width corresponding to the pseudorandom digital output signal, a low pass filter configured to pass a low frequency component of the control pulse signal, and an oscillator configured to generate a high-frequency output signal whose frequency is controlled based on the control pulse signal outputted by the low pass filter so as to be a frequency corresponding to the digital control signal. | ||
| 申请公布号 | US9019017(B2) | 申请公布日期 | 2015.04.28 |
| 申请号 | US201313765305 | 申请日期 | 2013.02.12 |
| 申请人 | Fujitsu Limited;Fujitsu Semiconductor Limited | 发明人 | Chaivipas Win;Marutani Masazumi;Yamazaki Daisuke |
| 分类号 | H03L7/085;H03L7/089;H03L7/00;H03L7/14;H03L7/093;H03L7/099 | 主分类号 | H03L7/085 |
| 代理机构 | Arent Fox LLP | 代理人 | Arent Fox LLP |
| 主权项 | 1. A digitally controlled oscillator, comprising: a high-order ΔΣ modulator configured to be of at least an order higher than a first order and configured to input a digital control signal and output a pseudorandom digital output signal; a first-order ΔΣ modulator configured to input the pseudorandom digital output signal and generate a control pulse signal including a pulse width corresponding to the pseudorandom digital output signal; a low pass filter configured to pass a low frequency component of the control pulse signal; and an oscillator configured to generate a high-frequency output signal whose frequency is controlled based on the control pulse signal outputted by the low pass filter so as to be a frequency corresponding to the digital control signal. | ||
| 地址 | Kawasaki JP | ||