Voltage-controlled variable oscillator, in particular for phase-lock loops.
- 申请公布号：
- EP0412435(B1)
- 申请号：
- EP19900114831
- 申请日期：
- 1990.08.02
- 申请公布日期：
- 1995.06.14
- 申请人：
- SGS-THOMSON MICROELECTRONICS S.R.L.
- 发明人：
- BETTI, GIORGIO;ZUFFADA, MAURIZIO
- 分类号：
- H03L7/099;H03B5/12;(IPC1-7):H03B5/12
- 主分类号：
- H03L7/099
- 摘要：
- <p>The voltage-controlled oscillator, comprises a differential stage formed by a pair of transistors ( T3 and T4) whose collectors define the output terminals between which an external resonating circuit (LC) is connected. A voltage generator (1) is connected between the two output terminals (A, B) and is suitable for generating a voltage which is proportional to the terminal voltage that exists across the resonating circuit (LC). The voltage generator output signal is applied to the resonation circuit (LC) through a pair of capacitors (Cs) to control the oscillating frequency. A bias current adjustment block (2) varies the bias current (Io) of the differential stage as the operating frequency varies in order to stabilize the peak-to-peak value of the output signal.</p>
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