发明公开
EP0383194A1 Dual port voltage controlled emitter coupled multivibrator
失效
Spannungskontrollierter emittergekoppelter Multivibrator mit zweiEingängen。
- 专利标题： Dual port voltage controlled emitter coupled multivibrator
- 专利标题（中）： Spannungskontrollierter emittergekoppelter Multivibrator mit zweiEingängen。
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申请号： EP90102468.7申请日： 1990-02-08
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公开(公告)号： EP0383194A1公开(公告)日： 1990-08-22
- 发明人: Menon, Suresh , Murthi, Enjeti
- 申请人： NATIONAL SEMICONDUCTOR CORPORATION
- 申请人地址： 2900 Semiconductor Drive P.O. Box 58090 Santa Clara California 95051-8090 US
- 专利权人： NATIONAL SEMICONDUCTOR CORPORATION
- 当前专利权人： NATIONAL SEMICONDUCTOR CORPORATION
- 当前专利权人地址： 2900 Semiconductor Drive P.O. Box 58090 Santa Clara California 95051-8090 US
- 代理机构： Sparing Röhl Henseler Patentanwälte
- 优先权： US311493 19890215
- 主分类号： H03K3/281
- IPC分类号： H03K3/281 ; H03K3/297
摘要：
A voltage controlled oscillator includes an emitter coupled multivibrator in which a capacitor determines the frequency of oscillation along with a pair of load resistors (14, 15) and a pair of current sources (16, 17). A differential amplifier (20, 21) is coupled to operate in parallel with the multivibrator and its tail current is operated differentially, with respect to the currents in the pair of sources (16, 17), in response to the input voltage at a first modulation input port. Thus, a constant current flows in the multivibrator loads even when the frequency is modulated. A second input port is coupled to vary the tail current in the differential amplifier to comprise a dual port control of the voltage controlled oscillator. The circuit can be operated at a relatively low supply voltage and can be temperature compensated. Furthermore, the input ports can include circuitry having a logarithimic response for digital signaling processing.
公开/授权文献
- EP0383194B1 Dual port voltage controlled emitter coupled multivibrator 公开/授权日：1993-07-28
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