发明名称 |
Variable frequency oscillator, and phase locked loop and clock synchronizer using thereof |
摘要 |
The variable frequency oscillator is capable of operation at a low power supply voltage and oscillating at a high frequency. A phase locked loop and a clock synchronizer use the variable frequency oscillator and have a wide oscillation frequency range. The variable frequency oscillator has plural delay cells which are cascaded and the output of the final stage delay cell is fed back to the input of the first stage delay cell. Each of the delay cells includes a differential amplifier and a positive feedback circuit, connected with input and output terminals intersecting with each other. The feedback circuit has complementary amplifiers each having an input terminal formed by connecting together gates of a pMOS and an nMOS transistor and an output terminal formed by connecting together the drains thereof.
|
申请公布号 |
US6535070(B2) |
申请公布日期 |
2003.03.18 |
申请号 |
US20010754382 |
申请日期 |
2001.01.05 |
申请人 |
HITACHI, LTD. |
发明人 |
HWANG CHANGKU;KOKUBO MASARU |
分类号 |
H03K3/354;H03K3/03;H03L7/089;H03L7/099;H03L7/10;(IPC1-7):H03B5/02 |
主分类号 |
H03K3/354 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|