发明名称 |
Electronic viewing aid |
摘要 |
A stabilised voltage controlled oscillator circuit comprises a closed loop circuit containing a voltage controlled oscillator (34), a local oscillator (40) and a harmonic mixer (38) that mixes a stabilised local oscillator (LO) frequency signal and a radio frequency (RF) signal from the voltage controlled oscillator (34) to obtain an intermediate frequency (IF) signal. An IF amplifier (42) is connected to a linear frequency discriminator (44) that provides an output signal to a summing amplifier (46), which is connected to the voltage controlled oscillator (34). The closed loop circuit uses the linear frequency discriminator (44) to provide a feedback signal that stabilises the voltage controlled oscillator (34). <IMAGE> |
申请公布号 |
GB2291551(B) |
申请公布日期 |
1998.03.18 |
申请号 |
GB19940012772 |
申请日期 |
1994.06.24 |
申请人 |
* ROSCOE C WILLIAMS LIMITED |
发明人 |
ROSCOE CHARLES * WILLIAMS |
分类号 |
A61F9/08;A61H3/06;G01S7/02;G01S7/03;G01S7/282;G01S7/35;G01S7/41;G01S13/34;G01S13/42;G01S13/44;G01S13/58;G01S13/88;H01Q1/27;H01Q1/38;H01Q21/06;H03B1/00;H03B5/18;H03B7/12;H03B9/14;H03B19/18;H03D3/26;H03D7/14;H03D9/04;H03D9/06;H03L7/06 |
主分类号 |
A61F9/08 |
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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