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1. 发明授权

US07215269B2 Delta-sigma analog-to-digital converter suitable for use in a radio receiver channel 失效
公开(公告)号：US07215269B2
公开(公告)日：2007-05-08
申请号：US11249236
申请日：2005-10-12
申请人： Wai L. Lee , Xudong Zhao , Amit Kumar , Jianping Wen , Garry N Link
发明人： Wai L. Lee , Xudong Zhao , Amit Kumar , Jianping Wen , Garry N Link
IPC分类号： H03M3/00
CPC分类号： H03M3/452 , H03H11/04 , H03H17/0664 , H03H2218/04 , H03H2218/10 , H03M3/424 , H03M3/448 , H03M3/454 , H03M3/462
摘要： A radio receiver channel includes an analog front end and a digital signal processing section coupled together by an analog-to-digital converter (ADC) having a delta-sigma modulator coupled to a first digital decimation filter, which is coupled to second digital decimation filter, wherein the first decimation filter includes a source of finite impulse response coefficients coupled so as to provide a plurality of coefficients. The delta-sigma modulator includes a loop filter having a plurality of serially coupled integrators, and a multi-bit quantizer coupled to the loop filter; the multi-bit quantizer including an ADC operable to produce a multi-bit digital output signal, the ADC coupled to a DAC having dual DAC feedback loops, and a dynamic element matching function. In one embodiment, the delta-sigma modulator includes a fifth-order loop filter having five serially coupled integrators with a feedback path from the output to the input of the fifth integrator and a feedback path from the output to the input of the third integrator.

2. 发明授权

US08207788B2 Calibrated feedback 有权
标题翻译：校准反馈
公开(公告)号：US08207788B2
公开(公告)日：2012-06-26
申请号：US12082081
申请日：2008-04-07
申请人： Wai L. Lee , Patrick A. Quinn , Garry N. Link , Adam C. Broun , Eric T. King
发明人： Wai L. Lee , Patrick A. Quinn , Garry N. Link , Adam C. Broun , Eric T. King
IPC分类号： H03F3/217
CPC分类号： H03F1/301 , H03F1/342 , H03F3/2173
摘要： A differential feedback amplifier is provided with a feedback network wherein that feedback network is adjustable so as to improve the PSRR of the amplifier. In another aspect of the present invention, a differential feedback amplifier is provided with a feedback network wherein that feedback network is adjustable so as to improve the CMRR of the amplifier. In a further aspect of the present invention, a Class D amplifier is provided with a passive differential feedback, summing with an input current at a differential virtual ground produced by an amplifier which is a sub-section of the Class D amplifier.
摘要翻译：差分反馈放大器设置有反馈网络，其中反馈网络是可调节的，以便改善放大器的PSRR。在本发明的另一方面，差分反馈放大器设置有反馈网络，其中反馈网络是可调节的，以便改善放大器的CMRR。在本发明的另一方面，D类放大器被提供有无源差分反馈，与由作为D类放大器的子部分的放大器产生的差分虚拟接地处的输入电流相加。

3. 发明申请

US20080272842A1 Calibrated feedback 有权
标题翻译：校准反馈
公开(公告)号：US20080272842A1
公开(公告)日：2008-11-06
申请号：US12082081
申请日：2008-04-07
申请人： Wai L. Lee , Patrick A. Quinn , Garry N. Link , Adam C. Broun , Eric T. King
发明人： Wai L. Lee , Patrick A. Quinn , Garry N. Link , Adam C. Broun , Eric T. King
IPC分类号： H03F3/217 , H03F3/45
CPC分类号： H03F1/301 , H03F1/342 , H03F3/2173
摘要： A differential feedback amplifier is provided with a feedback network wherein that feedback network is adjustable so as to improve the PSRR of the amplifier. In another aspect of the present invention, a differential feedback amplifier is provided with a feedback network wherein that feedback network is adjustable so as to improve the CMRR of the amplifier. In a further aspect of the present invention, a Class D amplifier is provided with a passive differential feedback, summing with an input current at a differential virtual ground produced by an amplifier which is a sub-section of the Class D amplifier.
摘要翻译：差分反馈放大器设置有反馈网络，其中反馈网络是可调节的，以便改善放大器的PSRR。在本发明的另一方面，差分反馈放大器设置有反馈网络，其中反馈网络是可调节的，以便改善放大器的CMRR。在本发明的另一方面，D类放大器被提供有无源差分反馈，与由作为D类放大器的子部分的放大器产生的差分虚拟接地处的输入电流相加。

4. 发明授权

US07345533B2 PWM digital amplifier with high-order loop filter 有权
公开(公告)号：US07345533B2
公开(公告)日：2008-03-18
申请号：US11308123
申请日：2006-03-07
申请人： Wai L. Lee
发明人： Wai L. Lee
IPC分类号： H03F3/38
CPC分类号： H03F3/217 , H03F1/26 , H03F1/32 , H03F2200/264 , H03F2200/351 , H03F2200/372
摘要： An improved PWM amplifier is disclosed that uses multiple integrators in the loop filter to provide high loop gain across the frequency band-of-interest. The frequency characteristics of the loop filter are optimized to distribute large loop gains across the entire band to provide large suppression of noise and distortions generated in the modulation and output stages.

5. 发明授权

US5621345A In-phase and quadrature sampling circuit 失效
标题翻译：同相和正交采样电路
公开(公告)号：US5621345A
公开(公告)日：1997-04-15
申请号：US418546
申请日：1995-04-07
申请人： Wai L. Lee , Norman D. Grant , Paul F. Ferguson, Jr.
发明人： Wai L. Lee , Norman D. Grant , Paul F. Ferguson, Jr.
IPC分类号： H03D7/16 , H03C3/00 , H03H11/16
CPC分类号： H03D7/165
摘要： A circuit that provides samples of in-phase and quadrature components of an input waveform includes an oversampling ADC that receives the input waveform and converts the input waveform to digital samples at an oversampling rate. A first digital filter, coupled to the ADC, receives the digital samples from the ADC and provides the in-phase component samples of the input waveform. A second digital filter, coupled to the ADC, receives the digital samples from the ADC and provides the quadrature component samples of the input waveform.
摘要翻译：提供输入波形的同相和正交分量的样本的电路包括过采样ADC，其接收输入波形，并以过采样率将输入波形转换为数字采样。耦合到ADC的第一个数字滤波器从ADC接收数字采样，并提供输入波形的同相分量采样。耦合到ADC的第二个数字滤波器从ADC接收数字采样，并提供输入波形的正交分量采样。

6. 发明授权

US5732002A Multi-rate IIR decimation and interpolation filters 失效
标题翻译：多速率IIR抽取和插值滤波器
公开(公告)号：US5732002A
公开(公告)日：1998-03-24
申请号：US447746
申请日：1995-05-23
申请人： Wai L. Lee , Tom W. Kwan
发明人： Wai L. Lee , Tom W. Kwan
IPC分类号： H03H17/04 , H03H19/00 , G06F17/17 , G06F17/10
CPC分类号： H03H17/0444 , H03H17/045 , H03H19/004
摘要： A digital filtering method that includes sampling an input signal at a first rate, integrating the signal, sampling the integrated version at a different rate, and combining the sampled integrated version with the input signal. The method can include again integrating the integrated version, sampling the twice integrated version at a third rate different from the first and second rates, and combining the twice integrated version with the integrated version and the input signal. The integrated version can be again integrated, the twice integrated version can be sampled at a third rate different from the first and second rates, and the twice integrated version can be combined with the integrated version. A common circuit component can be multiplexed to participate in two integrating steps.
摘要翻译：一种数字滤波方法，其包括以第一速率对输入信号进行采样，对信号进行积分，以不同速率对集成版本进行采样，以及将采样的集成版本与输入信号进行组合。该方法可以包括再次集成集成版本，以与第一和第二速率不同的第三速率对两次集成版本进行采样，并将两次集成版本与集成版本和输入信号组合。集成版本可以再次集成，可以以与第一和第二速率不同的第三速率对两次集成版本进行采样，并且两次集成版本可以与集成版本组合。公共电路组件可以被多路复用以参与两个集成步骤。

7. 发明授权

US5724037A Data acquisition system for computed tomography scanning and related applications 失效
标题翻译：计算机断层扫描数据采集系统及相关应用
公开(公告)号：US5724037A
公开(公告)日：1998-03-03
申请号：US447735
申请日：1995-05-23
申请人： Wai L. Lee
发明人： Wai L. Lee
IPC分类号： H03H17/02 , H03H17/06 , H03M3/02 , H03M3/00
CPC分类号： H03H17/0289 , H03H17/0628 , H03M3/462 , H03M3/364 , H03M3/43 , H03M3/452
摘要： A computed tomography imaging method includes receiving an analog beam intensity signal from a computed tomography scanner and converting the signal into a series of digital representations of the signal at successive points in time using a predetermined sample rate. Indications that a portion of the scanner has reached a certain position relative to the beam are received asynchronously with respect to the sample rate. The value of at least one of the digital representations is adjusted in response to the indications to obtain a corrected digital representation of the analog signal.
摘要翻译：计算机断层摄影成像方法包括从计算机断层摄影扫描仪接收模拟光束强度信号，并使用预定采样率将信号在连续的时间点将信号转换为信号的一系列数字表示。扫描仪的一部分相对于光束达到某一位置的指示相对于采样率异步地被接收。响应于指示来调整数字表示中的至少一个的值以获得模拟信号的校正数字表示。

8. 发明授权

US07443200B2 Capacitor-coupled level shifter with duty-cycle independence and supply referenced bias configuration 有权
标题翻译：具有占空比独立性和电源参考偏置配置的电容耦合电平转换器
公开(公告)号：US07443200B2
公开(公告)日：2008-10-28
申请号：US11784489
申请日：2007-04-05
申请人： Patrick A. Quinn , Wai L. Lee
发明人： Patrick A. Quinn , Wai L. Lee
IPC分类号： H03K19/094 , H03K19/0175
CPC分类号： H03K19/018521
摘要： A circuit architecture, or topology, that provides a level shifter which is substantially independent of the duty cycle of an input signal includes an H-bridge arrangement of field effect transistors, a pair of capacitively coupled inputs terminals connected to the gates of the high-side (i.e., connected to the positive power supply) transistors and a pair of voltage dividers to set the bias voltage at the gates of the high-side transistors, wherein one side of each voltage divider is coupled to the power supply node and the other side of each voltage divider is cross-coupled to the output node of the opposite side of the H- bridge.
摘要翻译：提供基本上独立于输入信号的占空比的电平移位器的电路架构或拓扑结构包括场效应晶体管的H桥布置，连接到高电平的栅极的一对电容耦合的输入端子，（即，连接到正电源）晶体管和一对分压器，以在高侧晶体管的栅极处设置偏置电压，其中每个分压器的一侧耦合到电源节点，而另一侧耦合到电源节点每个分压器的一侧交叉耦合到H桥的相对侧的输出节点。

9. 发明授权

US07388425B2 PWM digital amplifier with high-order loop filter 有权
标题翻译： PWM数字放大器具有高阶环路滤波器
公开(公告)号：US07388425B2
公开(公告)日：2008-06-17
申请号：US11308124
申请日：2006-03-08
申请人： Wai L. Lee
发明人： Wai L. Lee
IPC分类号： H03F3/38
CPC分类号： H03F1/32 , H03F1/26 , H03F3/217 , H03F3/38 , H03F2200/264 , H03F2200/351 , H03F2200/372
摘要： An improved PWM amplifier is disclosed that uses multiple integrators in the loop filter to provide high loop gain across the frequency band-of-interest. The frequency characteristics of the loop filter are optimized to distribute large loop gains across the entire band to provide large suppression of noise and distortions generated in the modulation and output stages.
摘要翻译：公开了一种改进的PWM放大器，其使用环路滤波器中的多个积分器来提供跨越频带的高环路增益。环路滤波器的频率特性被优化以在整个频带上分配大的环路增益，以提供在调制和输出级中产生的噪声和失真的大的抑制。

10. 发明授权

US07271650B2 PWM digital amplifier with high-order loop filter 有权
标题翻译： PWM数字放大器具有高阶环路滤波器
公开(公告)号：US07271650B2
公开(公告)日：2007-09-18
申请号：US11308122
申请日：2006-03-07
申请人： Wai L. Lee
发明人： Wai L. Lee
IPC分类号： H03F3/38
CPC分类号： H03F3/217 , H03F1/26 , H03F1/32 , H03F2200/264 , H03F2200/351 , H03F2200/372
摘要： An improved PWM amplifier is disclosed that uses multiple integrators in the loop filter to provide high loop gain across the frequency band-of-interest. The frequency characteristics of the loop filter are optimized to distribute large loop gains across the entire band to provide large suppression of noise and distortions generated in the modulation and output stages.
摘要翻译：公开了一种改进的PWM放大器，其使用环路滤波器中的多个积分器来提供跨越频带的高环路增益。环路滤波器的频率特性被优化以在整个频带上分配大的环路增益，以提供在调制和输出级中产生的噪声和失真的大的抑制。

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