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11. 发明授权

US5777521A Parallel accumulator fractional-n frequency synthesizer 失效
$Parallel accumulator fractional-n frequency synthesizer$
标题翻译：并行累加器分数n频率合成器
公开(公告)号：US5777521A
公开(公告)日：1998-07-07
申请号：US910000
申请日：1997-08-12
申请人： Steven F. Gillig , Michael L. Bushman
发明人： Steven F. Gillig , Michael L. Bushman
IPC分类号： H03L7/197
CPC分类号： H03L7/1976
摘要： A frequency synthesizer (10) including a synthesizer loop (12) with a fractional-N divider (14), and including a divider control circuit (18) and a combining circuit (22). The divider control circuit (18) provides a variable divide value (20) to the divider (14). The carry values of two accumulators (24, 26) having differing accumulator lengths are applied in parallel to the combining circuit (22). Each of the accumulators (24, 26) provides a portion of a desired fractional divide value (20). The combining circuit (22) also adds an integer divide value (36) to the fractional divide value (16). By coupling the accumulators (24, 26) in parallel, a high frequency resolution with minimal spurious frequencies is achieved, using a simple, low cost circuit.
摘要翻译：一种频率合成器（10），包括具有分数N分频器（14）的合成器环路（12），并且包括分频器控制电路（18）和组合电路（22）。分频器控制电路（18）向分频器（14）提供可变分频值（20）。具有不同累加器长度的两个累加器（24,26）的进位值并联施加到组合电路（22）。每个累加器（24,26）提供期望的分数除数值（20）的一部分。组合电路（22）还向分数除法值（16）加上整数除数值（36）。通过并联耦合累加器（24,26），使用简单的低成本电路实现具有最小寄生频率的高频分辨率。

12. 发明授权

US5856766A Communication device with a frequency compensating synthesizer and method of providing same 失效
标题翻译：具有频率补偿合成器的通信装置及其提供方法
公开(公告)号：US5856766A
公开(公告)日：1999-01-05
申请号：US885003
申请日：1997-06-30
申请人： Steven F. Gillig , Michael L. Bushman , Lawrence E. Connell
发明人： Steven F. Gillig , Michael L. Bushman , Lawrence E. Connell
IPC分类号： H03L1/02 , H03L7/197 , H03L7/23 , H04B1/40 , H03L7/06
CPC分类号： H03L7/23 , H03L1/026 , H03L7/197 , H03L7/1974 , H04B1/403
摘要： A communication device including a plurality of frequency synthesizers (24, 28, 30). At least one of the frequency synthesizers (24) is driven with a reference frequency from a crystal oscillator (58). The at least one frequency synthesizer (24) includes a phase locked loop with a fractional-N divider (48) which is programmed by a control circuit (64) to vary as a function of temperature compensation, frequency compensation, and a frequency multiplication factor. The output (46) of the at least one frequency synthesizer (24) is used to provide a compensated reference frequency input for the remaining frequency synthesizers (28, 30). The radio provides all the frequency synthesizers (24, 28, 30) with temperature and frequency compensation using a reference frequency from a crystal oscillator (58) and only one high resolution frequency compensating synthesizer (24).
摘要翻译：一种包括多个频率合成器（24,28,30）的通信装置。频率合成器（24）中的至少一个以来自晶体振荡器（58）的参考频率驱动。所述至少一个频率合成器（24）包括具有分数N分频器（48）的锁相环，该分频器由控制电路（64）编程以根据温度补偿，频率补偿和频率倍增因子。所述至少一个频率合成器（24）的输出（46）用于为剩余频率合成器（28,30）提供经补偿的参考频率输入。无线电设备使用来自晶体振荡器（58）和仅一个高分辨率频率补偿合成器（24）的参考频率来提供所有频率合成器（24,28,30）的温度和频率补偿。

13. 发明授权

US5530403A Low-voltage differential amplifier 失效
标题翻译：低压差分放大器
公开(公告)号：US5530403A
公开(公告)日：1996-06-25
申请号：US432646
申请日：1995-05-03
申请人： Michael L. Bushman , Lawrence E. Connell
发明人： Michael L. Bushman , Lawrence E. Connell
IPC分类号： H03F3/45
CPC分类号： H03F3/45076
摘要： A low-voltage differential amplifier (10) includes a circuit (12) having a differential pair (14) and loads (22 and 24). The first load (22) can include a first embedded differential amplifier (30) and an output transistor (32) and the second load (24) can include a second embedded differential amplifier (36) and an output transistor (38). The differential amplifier (10) can provide a wide-voltage operable range. The differential amplifier (10) is particularly useful in connection with low-voltage temperature compensated crystal oscillators.
摘要翻译：低压差分放大器（10）包括具有差分对（14）和负载（22和24）的电路（12）。第一负载（22）可以包括第一嵌入式差分放大器（30）和输出晶体管（32），第二负载（24）可以包括第二嵌入式差分放大器（36）和输出晶体管（38）。差分放大器（10）可以提供宽电压可操作的范围。差分放大器（10）在低压温度补偿晶体振荡器方面特别有用。

14. 发明授权

US06990164B2 Dual steered frequency synthesizer 有权
标题翻译：双转向频率合成器
公开(公告)号：US06990164B2
公开(公告)日：2006-01-24
申请号：US09968178
申请日：2001-10-01
申请人： Michael L. Bushman , Lawrence E. Connell
发明人： Michael L. Bushman , Lawrence E. Connell
IPC分类号： H03D3/24
CPC分类号： H03L7/18 , H03L7/0891 , H03L7/093 , H03L7/0995 , H03L2207/06
摘要： A frequency synthesizer 100 comprising a charge pump 102, a loop filter 104, a loop divider 106, and an active and dual port VCO 110. An integrator 108 low pass filters a steering voltage to provide a low frequency path while the steering voltage provides a high frequency path. Both steering paths are connected to dual port VCO 110. The dual port VCO 110 is a single frequency generator which is controlled by two control signals. The dual port VCO 110, effectively provides the equivalent of a low frequency path 114 and a high frequency noise compensation path 112, both paths effectively merging 116 by superposition.
摘要翻译：频率合成器100包括电荷泵102，环路滤波器104，环路分频器106以及有源和双端口VCO 110。积分器108低通滤波转向电压以提供低频路径，同时转向电压提供高频路径。两个转向路径都连接到双端口VCO 110。双端口VCO 110是由两个控制信号控制的单频发生器。双端口VCO 110有效地提供等效的低频路径114和高频噪声补偿路径112，两个路径通过叠加有效地合并116。

15. 发明授权

US5691671A Method and apparatus for a crystal oscillator using piecewise linear odd symmetry temperature compensation 失效
标题翻译：使用分段线性奇对称温度补偿的晶体振荡器的方法和装置
公开(公告)号：US5691671A
公开(公告)日：1997-11-25
申请号：US678904
申请日：1996-07-12
申请人： Michael L. Bushman
发明人： Michael L. Bushman
IPC分类号： H03L1/02 , H03B5/32
CPC分类号： H03L1/022 , H03L1/028
摘要： A method for temperature compensating a crystal oscillator (16) which includes a plurality of operational amplifiers (18,20) being driven by a temperature-dependent diode signal (28). The amplifiers (18,20) all operate across the entire temperature range of the crystal oscillator (16). Each amplifier (18,20) is adjusted to provide an gain (34,40,42,44,46) having a piecewise linear signal having odd symmetry about an inflection temperature (38) of a Bechmann curve of a crystal oscillator (16). The gain, slope and clipping of each amplifier (18,20) is adjusted such that the amplifier gains (34,40,42,44,46), when summed over the entire temperature range, provide a compensation signal (30) proportional to the Bechmann curve. The compensation signal (30) is subsequently applied to a tuning circuit of the crystal oscillator (16) such that a temperature compensated output (32) is obtained.
摘要翻译：一种用于温度补偿晶体振荡器（16）的方法，其包括由温度依赖二极管信号（28）驱动的多个运算放大器（18,20）。放大器（18,20）都在晶体振荡器（16）的整个温度范围内工作。每个放大器（18,20）被调节以提供具有关于晶体振荡器（16）的贝克曼曲线的拐点温度（38）的奇对称的分段线性信号的增益（34,40,42,44,46）。调整每个放大器（18,20）的增益，斜率和限幅，使得放大器增益（34,40,42,44,46）在整个温度范围内相加时，提供与贝克曼曲线。补偿信号（30）随后被施加到晶体振荡器（16）的调谐电路，使得获得温度补偿输出（32）。

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