发明名称 |
Switched-capacitor modulator for quadrature modulation |
摘要 |
A switched-capacitor modulator for quadrature modulation is disclosed. The modulator of the present invention provides a means for simultaneous modulation of two carrier signals in quadrature by two input signals in such a way that the gains of the two modulations are exactly the same. In accordance with the invention a switched-capacitor modulator is provided having a plurality of input signal sources for quadrature amplitude modulation. The invention provides for a single common switched-capacitor network with multiple switches or multiple switched-capacitor networks for each incoming modulating signal. A switched-capacitor network utilized to form and modulate a carrier signal for shaping the carrier to reduce sidebands of the third and fifth harmonics in the modulated signal is also disclosed.
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申请公布号 |
US4458216(A) |
申请公布日期 |
1984.07.03 |
申请号 |
US19810304690 |
申请日期 |
1981.09.22 |
申请人 |
RACAL-VADIC, INC. |
发明人 |
BINGHAM, JOHN A. C. |
分类号 |
H04L27/20;H03C1/00;H03H19/00;H03K4/02;H04L27/34;H04L27/36;(IPC1-7):H03C1/02;H03K7/00 |
主分类号 |
H04L27/20 |
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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