发明名称 |
Multiposition switch with minimum interconnections |
摘要 |
A frequency synthesized transceiver capable of tuning to a plurality of communication channels is disclosed. The transceiver includes a receiver section and a transmitter section which are coupled to the synthesizer which generates the appropriate injection signals to achieve tuning. The frequency synthesizer includes a multiposition switch which accesses various addressable memory locations in a programmable read-only memory where the appropriate divisors are stored to cause tuning of the synthesizer to the appropriate communication channel. The multiposition switch has a minimum number of interconnection lines connected to an analysis circuit which identifies the switch position. A zone selector switch enables grouping and easy retrievability of channels. The divisors are supplied to a single synchronous binary swallow counter which works in conjunction with a dual modulus prescaler to monitor the frequency output of the voltage controlled oscillator. A programmable divider coupled to a reference oscillator source is compared with the output of the synchronous counter in a digital and analog phase detector. The phase detector supplies signals through a loop filter to apply the appropriate voltage to the voltage controlled oscillator. The phase detector includes means to rapid advance the voltage controlled oscillator to cause frequency tuning.
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申请公布号 |
US4441098(A) |
申请公布日期 |
1984.04.03 |
申请号 |
US19810251640 |
申请日期 |
1981.04.06 |
申请人 |
MOTOROLA, INC. |
发明人 |
BORRAS, JAIME A.;GONZALEZ, RUBEN J. |
分类号 |
H03C3/09;H03C3/22;H03D13/00;H03J5/02;H03K23/66;H03L7/08;H03L7/193;H03L7/199;H04B1/40;(IPC1-7):G08C9/08 |
主分类号 |
H03C3/09 |
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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