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    • 13. 发明授权
    • Temperature compensation of a crystal reference using direct digital
synthesis
    • 使用直接数字合成的晶体参考温度补偿
    • US5216389A
    • 1993-06-01
    • US828829
    • 1992-01-31
    • Cesar W. CarraleroJaime A. BorrasArmando J. Gonzalez
    • Cesar W. CarraleroJaime A. BorrasArmando J. Gonzalez
    • G06F1/03H03L1/02H03L7/18
    • H03L1/026H03L7/1806G06F1/0328
    • Certain operational characteristics of a crystal (104) are measured during a testing and grading process. Once determined, information representing these operational characteristics are stored in memory (120) and utilized by a controller (122) to increment a phase increment register (114) upon determining the crystals ambient temperature via a temperature sensing circuit (124). The value stored in the phase increment register (114) is then sent to a phase accumulator (116) where successive phase increments are summed together. This summed value is in turn sent to a sine lookup table (118) where the instantaneous phase value is converted into sine amplitude. Finally, a digital to analog converter (126) converts the amplitude bit stream into an analog signal for use as a reference oscillator frequency having extremely high frequency resolution. The above mentioned process is repeated every clock cycle until a complete sine wave is produced at which point the phase accumulator is reset to zero and the process begins again.
    • 在测试和分级过程中测量晶体(104)的某些操作特性。 一旦确定,表示这些操作特性的信息被存储在存储器(120)中,并由控制器(122)利用,以在通过温度检测电路(124)确定晶体环境温度之后递增相位增量寄存器(114)。 存储在相位增量寄存器(114)中的值然后被发送到相位累加器(116),其中连续的相位增量被相加在一起。 该总和值又被发送到正弦查找表(118),其中瞬时相位值被转换成正弦幅度。 最后,数模转换器(126)将振幅比特流转换为模拟信号,以用作具有极高频率分辨率的参考振荡器频率。 每个时钟周期重复上述过程,直到产生完整的正弦波,在该点将相位累加器复位到零,并且该过程再次开始。
    • 17. 发明授权
    • Range control circuit for counter to be used in a frequency synthesizer
    • 用于频率合成器的计数器范围控制电路
    • US4477919A
    • 1984-10-16
    • US251572
    • 1981-04-06
    • Jaime A. BorrasRuben J. Gonzalez
    • Jaime A. BorrasRuben J. Gonzalez
    • H03C3/09H03C3/22H03D13/00H03J5/02H03K23/66H03L7/08H03L7/193H03L7/199H04B1/40H03K21/36
    • H03K21/38H03C3/0933H03C3/0941H03C3/0958H03C3/0966H03C3/227H03D13/005H03J5/0281H03K23/667H03L7/0802H03L7/193H03L7/199H04B1/405
    • 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. 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.
    • 公开了能够调谐到多个通信信道的频率合成收发器。 收发器包括接收器部分和发射器部分,其耦合到合成器,其产生适当的注入信号以实现调谐。 频率合成器包括一个多位开关,该多位开关访问可编程只读存储器中的各种可寻址存储器位置,其中存储适当的除数以使合成器调谐到合适的通信信道。 区域选择开关使分组和通道容易检索。 除数被提供给单个同步二进制吞咽计数器,其与双模预分频器一起工作以监视压控振荡器的频率输出。 耦合到参考振荡器源的可编程分频器与数字和模拟相位检测器中的同步计数器的输出进行比较。 相位检测器通过环路滤波器提供信号,以将适当的电压施加到压控振荡器。 相位检测器包括用于快速推进压控振荡器以引起频率调谐的装置。