发明名称 |
CMOS LC-Schwingkreis-Oszillator |
摘要 |
A CMOS LC-tank oscillator comprises a pair of symmetric inductors and a differential pair of transistors. The inductors have a first one of their terminals interconnected at a supply node to which a voltage supply is applied through a supply resistor and a second terminal connected to the drain of a respective one of the transistors. The transistors have their sources interconnected at a tail node which is connected to ground through a tail resistor. A current control loop controls a core current between the supply and tail nodes so as to keep a voltage drop across the tail resistor at a level determined by a reference voltage. Contrary to a conventional approach with a voltage supply regulator upstream of the supply node and a bias regulator downstream of the tail node of the oscillator, the current control loop keeps the core current between the supply and tail nodes at the required level so that a resistor may replace the upstream supply voltage regulator and another resistor may replace the downstream bias regulator. Consequently, sources of noise injected into the LC-tank type oscillator are eliminated. <IMAGE> |
申请公布号 |
DE102004025545(B4) |
申请公布日期 |
2007.02.15 |
申请号 |
DE20041025545 |
申请日期 |
2004.05.25 |
申请人 |
TEXAS INSTRUMENTS DEUTSCHLAND GMBH |
发明人 |
GELHAUSEN, FRANK;MUTH, KARLHEINZ |
分类号 |
H03L5/00;H03B1/04;H03B5/04;H03B5/12 |
主分类号 |
H03L5/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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