发明名称 |
Dual conversion transmitter |
摘要 |
A transmitter using a dual conversion system which effects frequency conversion twice has a local oscillator (113) for generating a first local oscillation signal, a multiplier (118) for multiplying the frequency of the first local oscillation signal to produce a second local oscillation signal, a first mixer (115) for mixing the first local oscillation signal and first IF signal to produce a second IF signal, and a second mixer (120) for mixing the second local oscillation signal and second IF signal to produce a signal to be transmitted. A voltage controlled filter (116) whose center frequency varies with the frequency of the first local oscillation signal is connected to the output of the first mixer (115).
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申请公布号 |
US5410747(A) |
申请公布日期 |
1995.04.25 |
申请号 |
US19930092667 |
申请日期 |
1993.07.14 |
申请人 |
NEC CORPORATION |
发明人 |
OHMAGARI, SHINICHI;YAMAMOTO, OSAMU |
分类号 |
H04B1/04;H03B21/02;H03D7/16;H03J1/00;H03J3/28;(IPC1-7):H04B1/04 |
主分类号 |
H04B1/04 |
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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