发明名称 |
VOLTAGE CONTROL OSCILLATOR, PHASE SYNCHRONIZING CIRCUIT AND SIGNAL PROCESSING CIRCUIT |
摘要 |
PROBLEM TO BE SOLVED: To obtain an inexpensive voltage control oscillator by means of simplifying a configuration and easily attaining realization in an integrated circuit by positively feeding back a pulse signal obtained by means of binarizing the output signal of a delay amount variable filter to the input side of the filter by a desired level. SOLUTION: A quaternary butter-worth low-pass filter(LPF) 7 is used as the delay amount variable filter. In the LPF 7, a cut-off frequency is changed in accordance with a control signal from a control input node 5, a delay time is changed with it, an input signal is delayed and the signal is outputted. A voltage comparing circuit(comparator) 8 for binarizing the input signal and outputting the pulse signal with desired amplitude is connected to a positive feedback loop circuit at the output side of the LPF 7. Then loop connection is executed to positively feed back the output pulse signal to the LPF 7.
|
申请公布号 |
JP2001060869(A) |
申请公布日期 |
2001.03.06 |
申请号 |
JP20000160191 |
申请日期 |
2000.05.30 |
申请人 |
TOSHIBA CORP;TOSHIBA INFORMATION SYSTEMS (JAPAN) CORP |
发明人 |
NAKAMURA NORIO;OMI KATSUYUKI;SHIRAMATSU TOSHIO;GOTO OSAYASU;HASHIMOTO MASARU |
分类号 |
G11B20/14;H03B5/24;H03L5/00;H03L7/099;H03L7/187;(IPC1-7):H03L7/099 |
主分类号 |
G11B20/14 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|