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1. 发明申请

US20050048939A1 Apparatus and method for local oscillator calibration in mixer circuits 有权
标题翻译：混频器电路中本地振荡器校准的装置和方法
公开(公告)号：US20050048939A1
公开(公告)日：2005-03-03
申请号：US10649807
申请日：2003-08-28
申请人： Donald McMullin , Ramon Gomez , Lawrence Burns , Myles Wakayama
发明人： Donald McMullin , Ramon Gomez , Lawrence Burns , Myles Wakayama
IPC分类号： H04B1/28 , H04B1/18
CPC分类号： H04B1/28
摘要： An apparatus and method for local oscillator calibration compensates for filter passband variation in a mixer circuit, such as a receiver circuit. The receiver includes at least a mixer circuit and a filter coupled to the output of the mixer. During operation, the mixer mixes an RF input signal with a first local oscillator (LO) signal to frequency translate a selected channel in the RF input signal into the passband of the filter. During a calibration mode, the RF input signal is disabled, and the first LO signal is injected into the filter input by leaking the first LO signal through the mixer circuit. The frequency of the LO signal is then swept over a frequency bandwidth that is sufficiently wide so that the actual passband is detected by measuring the signal amplitude at the output of the bandpass filter, thereby determining any variation in the passband of the filter from the expected passband. Once the actual passband is determined, then the frequency of the first local oscillator signal is adjusted or tuned to compensate for any frequency shift of the actual passband compared to the expected passband. Therefore, the selected channel is up-converted into the center of the actual passband of the bandpass filter and will not fall outside the passband. This enables the passband of the bandpass filter to be narrowed, as compared with conventional receivers that do not utilize this calibration procedure. For example, the bandpass filter can be narrowed to one or two channels wide.
摘要翻译：用于本地振荡器校准的装置和方法补偿诸如接收机电路的混频器电路中的滤波器通带变化。接收器至少包括混频器电路和耦合到混频器输出端的滤波器。在操作期间，混频器将RF输入信号与第一本地振荡器（LO）信号混频，以将RF输入信号中的选定信道频率转换成滤波器的通带。在校准模式期间，RF输入信号被禁止，并且通过将第一LO信号泄漏通过混频器电路将第一LO信号注入滤波器输入。然后将LO信号的频率扫过足够宽的频带宽度，以便通过测量带通滤波器输出端的信号振幅来检测实际通带，从而根据预期的方式确定滤波器通带的任何变化通带。一旦确定了实际通带，则调整或调谐第一本地振荡器信号的频率，以补偿与预期通带相比实际通带的任何频移。因此，所选通道被上变频为带通滤波器的实际通带的中心，不会落在通带外。与使用该校准程序的常规接收器相比，这使带通滤波器的通带变窄。例如，带通滤波器可以变窄到一个或两个通道宽。

2. 发明申请

US20060026661A1 Integrated set-top box 有权
标题翻译：集成机顶盒
公开(公告)号：US20060026661A1
公开(公告)日：2006-02-02
申请号：US11133237
申请日：2005-05-20
申请人： Donald McMullin , Lawrence Burns , Leonard Dauphinee , Ramon Gomez , Loke Tan
发明人： Donald McMullin , Lawrence Burns , Leonard Dauphinee , Ramon Gomez , Loke Tan
IPC分类号： H04N7/173
CPC分类号： H04N21/6168 , H04N7/17309 , H04N21/40
摘要： The present invention is an integrated set-top box. In one embodiment, the up-stream path and the down-stream path are integrated on a common semiconductor substrate. The down-stream path can include a TV tuner and a digital receiver portion that is integrated on the common semiconductor substrate with a power amplifier of the up-stream path. In another embodiment, the TV tuner is implemented on a first semiconductor substrate and the digital receiver portion and the power amplifier are configured on a second semiconductor substrate. However, the two substrates are mounted on a common carrier so that the set-top box appears to be a single chip configuration to the user.
摘要翻译：本发明是一种集成的机顶盒。在一个实施例中，上游路径和下游路径被集成在公共半导体衬底上。下行路径可以包括集成在公共半导体衬底上的TV调谐器和数字接收器部分，其具有上行路径的功率放大器。在另一个实施例中，TV调谐器被实现在第一半导体衬底上，并且数字接收器部分和功率放大器配置在第二半导体衬底上。然而，两个基板安装在公共载体上，使得机顶盒看起来是用户的单芯片配置。

3. 发明申请

US20060026659A1 Integrated cable modem 有权
公开(公告)号：US20060026659A1
公开(公告)日：2006-02-02
申请号：US11133275
申请日：2005-05-20
申请人： Donald McMullin , Lawrence Burns , Leonard Dauphinee , Ramon Gomez , Loke Tan
发明人： Donald McMullin , Lawrence Burns , Leonard Dauphinee , Ramon Gomez , Loke Tan
IPC分类号： H04N7/173
CPC分类号： H04N21/6168 , H04N21/25883 , H04N21/25891 , H04N21/4263
摘要： The present invention is an integrated cable modem tuner. In one embodiment, the upstream path and the downstream path are integrated on a common semiconductor substrate. The down-stream path can include a TV tuner and digital receiver portion that is integrated on a common semiconductor substrate with the power amplifier of the upstream path. In another embodiment, the TV tuner is implemented on a first semiconductor substrate and the digital receiver portion and the power amplifier are configured on a second semiconductor substrate. However, the two substrates are mounted on a common carrier so that the cable modem appears to be a single chip configuration to the user.

4. 发明申请

US20050024541A1 Apparatus and method for restoring DC spectrum for analog television reception using direct conversation tuners 失效
标题翻译：用于使用直接会话调谐器恢复用于模拟电视接收的DC频谱的装置和方法
公开(公告)号：US20050024541A1
公开(公告)日：2005-02-03
申请号：US10630656
申请日：2003-07-31
申请人： Ramon Gomez , Myles Wakayama
发明人： Ramon Gomez , Myles Wakayama
IPC分类号： H03D3/00 , H04N5/16
CPC分类号： H03D3/008
摘要： A DC compensation circuit restores the frequency spectrum of an input signal at DC (or 0 Hz) by removing or reducing DC offset, 1/f noise, or any other unwanted noise at or near 0 Hz. The DC compensation is performed using direct coupling, as opposed to AC coupling, so that no useful signal information in the active period of the input signal is lost at DC. The DC compensation circuit samples the input signal during an inactive period of the input signal. Afterwhich, the unwanted DC noise is determined from the sampled signal and stored until an active period of the input signal. For example, the sampled signal can be filtered using a passband around DC so as to isolate the signal energy at DC during the inactive period. Since there is no useful signal information present during the inactive period, any signal energy at the output of the filter is necessarily unwanted DC noise. In a feed-forward approach, the unwanted DC noise is then subtracted from the input signal during the active period of the input signal to compensate or cancel the unwanted DC noise. Alternatively, the unwanted DC noise could be sampled and determined during the inactive period and then fed back (after filtering) in order to be subtracted during the active period of the input signal.
摘要翻译： DC补偿电路通过去除或减少直流偏移，1 / f噪声或在0Hz附近或其附近的任何其他不需要的噪声来恢复DC（或0 Hz）输入信号的频谱。直流补偿使用直接耦合进行，而不是交流耦合，因此在直流输入信号的有效周期内没有有用的信号信息丢失。直流补偿电路在输入信号的无效期间对输入信号进行采样。之后，根据采样信号确定不需要的DC噪声，直到输入信号的有效周期为止。例如，可以使用围绕DC的通带来对采样信号进行滤波，以便在非活动时段期间隔离DC处的信号能量。由于在非活动时段期间没有有用的信号信息，所以滤波器输出处的任何信号能量必然是不需要的DC噪声。在前馈方法中，在输入信号的有效周期内，从输入信号中减去不需要的直流噪声，以补偿或消除不需要的直流噪声。或者，可以在不活动时段期间对不想要的DC噪声进行采样和确定，然后反馈（在滤波之后），以便在输入信号的有效周期期间被减去。

5. 发明申请

US20050221784A1 Dual conversion receiver with reduced harmonic interference 有权
标题翻译：具有减少谐波干扰的双转换接收器
公开(公告)号：US20050221784A1
公开(公告)日：2005-10-06
申请号：US10984750
申请日：2004-11-10
申请人： Ramon Gomez , Myles Wakayama
发明人： Ramon Gomez , Myles Wakayama
IPC分类号： H04B1/26 , H04B1/28 , H04B1/40 , H04B15/00
CPC分类号： H04B1/28
摘要： A dual conversion receiver selects and down-converts one channel from a plurality of channels in a received RF signal. The dual conversion receiver includes first and second mixer stages that are driven by first and second local oscillator signals. Channel selection is performed by tuning the first local oscillator signal so that a desired channel is up-converted to a first IF frequency, which defines the center of the passband of a first bandpass filter connected between the first and second mixer stages. The second mixer stage down-converts the output of the first bandpass filter to a second IF frequency, which is further filtered by a second bandpass filter. The first and second local oscillators can produce harmonics that mix in the second mixer stage, causing unwanted spurious signals that can fall in band with the second IF frequency. In order to avoid interference from these unwanted spurious signals, the frequency step size of the first local oscillator is tuned so that the spurious signals fall out-of-band of the second IF frequency.
摘要翻译：双转换接收器从接收到的RF信号中的多个信道中选择并降频一个信道。双转换接收机包括由第一和第二本地振荡器信号驱动的第一和第二混频器级。通过调谐第一本地振荡器信号来执行信道选择，使得期望的信道被上变频到第一IF频率，该第一IF频率定义连接在第一和第二混频器级之间的第一带通滤波器的通带的中心。第二混频器级将第一带通滤波器的输出降频转换为第二IF频率，第二IF频率由第二带通滤波器进一步滤波。第一和第二本地振荡器可以产生在第二混频器级中混合的谐波，从而产生可能与第二IF频率成带的不想要的寄生信号。为了避免来自这些不想要的寄生信号的干扰，调整第一本地振荡器的频率步长，使得杂散信号落在第二IF频率的带外。

6. 发明授权

US07535976B2 Apparatus and method for integration of tuner functions in a digital receiver 有权
标题翻译：在数字接收机中集成调谐器功能的装置和方法
公开(公告)号：US07535976B2
公开(公告)日：2009-05-19
申请号：US10902477
申请日：2004-07-30
申请人： Steven Jaffee , Donald McMullin , Ramon Gomez
发明人： Steven Jaffee , Donald McMullin , Ramon Gomez
IPC分类号： H03D3/18
CPC分类号： H04L27/38 , H03D3/009 , H03J1/005 , H04L2027/0016
摘要： A receiver to process a RF input signal having a plurality of channels includes a direct down conversion circuit, a demodulation circuit, and a local oscillator circuit. The direct down conversion circuit provides a downconverted signal based on the RF input signal and a local oscillator signal. The demodulation circuit receives the downconverted signal and provides a demodulated signal. The local oscillator circuit sets a frequency of the local oscillator signal based on a selected channel of the plurality of channels.
摘要翻译：用于处理具有多个通道的RF输入信号的接收器包括直接下变频电路，解调电路和本地振荡器电路。直接下变频电路基于RF输入信号和本地振荡器信号提供下变频信号。解调电路接收下变频信号并提供解调信号。本地振荡器电路基于多个信道的所选信道来设置本地振荡器信号的频率。

7. 发明申请

US20060025096A1 Apparatus and method to provide a local oscillator signal 有权
公开(公告)号：US20060025096A1
公开(公告)日：2006-02-02
申请号：US10902465
申请日：2004-07-30
申请人： Steven Jaffe , Donald McMullin , Ramon Gomez
发明人： Steven Jaffe , Donald McMullin , Ramon Gomez
IPC分类号： H04B7/00
CPC分类号： H04B1/28 , H04B1/0014 , H04B1/0032 , H04B1/0039
摘要： An apparatus provides a local oscillator signal based on a selected channel of an RF input signal. For example, the apparatus can set a frequency of the local oscillator signal based on the selected channel. Digital circuitry can be used to generate the local oscillator signal. For instance, the digital circuitry can provide a digital representation of the local oscillator signal. A DAC can convert the digital representation to an analog signal. Other circuitry can provide first and second quadrature components of the local oscillator signal, based on the analog signal.

8. 发明申请

US20070026831A1 Apparatus and method to provide a local oscillator signal 有权
标题翻译：提供本地振荡器信号的装置和方法
公开(公告)号：US20070026831A1
公开(公告)日：2007-02-01
申请号：US11540662
申请日：2006-10-02
申请人： Steven Jaffe , Donald McMullin , Ramon Gomez
发明人： Steven Jaffe , Donald McMullin , Ramon Gomez
IPC分类号： H04B7/00
CPC分类号： H04B1/28 , H04B1/0014 , H04B1/0032 , H04B1/0039
摘要： An apparatus provides a local oscillator signal based on a selected channel of an RF input signal. For example, the apparatus can set a frequency of the local oscillator signal based on the selected channel. Digital circuitry can be used to generate the local oscillator signal. For instance, the digital circuitry can provide a digital representation of the local oscillator signal. A DAC can convert the digital representation to an analog signal. Other circuitry can provide first and second quadrature components of the local oscillator signal, based on the analog signal.
摘要翻译：一种装置基于RF输入信号的所选择的信道提供本地振荡器信号。例如，该装置可以基于所选择的信道来设置本地振荡器信号的频率。数字电路可用于产生本地振荡器信号。例如，数字电路可以提供本地振荡器信号的数字表示。 DAC可以将数字表示转换为模拟信号。其他电路可以基于模拟信号提供本地振荡器信号的第一和第二正交分量。

9. 发明申请

US20060007999A1 Method and system for enhancing image rejection in communications receivers using test tones and a baseband equalizer 审中-公开
标题翻译：用于增强使用测试音和通信基带均衡器的通信接收机中的图像抑制的方法和系统
公开(公告)号：US20060007999A1
公开(公告)日：2006-01-12
申请号：US11029733
申请日：2005-01-05
申请人： Ramon Gomez , Donald McMullin
发明人： Ramon Gomez , Donald McMullin
IPC分类号： H03H7/30
CPC分类号： H04B1/30
摘要： Certain embodiments of the invention provide a method and system for enhancing image rejection in communications receivers. A test tone signal may be injected into a receiver. A quadrature error in an in-phase (I) channel and a quadrature (Q) channel of the receiver may be estimated based on the injecting of the test tone signal into the receiver. A plurality of equalizer coefficients may be adjusted to correct the estimated quadrature error in the I channel and the Q channel of the receiver. A corrected I channel and a corrected Q channel may be generated corresponding to the I channel and the Q channel in the receiver based on the adjusting of the equalizer coefficients.
摘要翻译：本发明的某些实施例提供了一种用于增强通信接收机中的镜像抑制的方法和系统。测试音信号可以被注入接收机。可以基于将测试音信号注入到接收机中来估计接收机的同相（I）信道和正交（Q）信道中的正交误差。可以调整多个均衡器系数以校正接收机的I信道和Q信道中的估计的正交误差。可以基于均衡器系数的调整，对应于接收机中的I信道和Q信道来生成校正的I信道和校正的Q信道。

10. 发明申请

US20050041802A1 Systems and methods for digital upconversion for television signals 有权
标题翻译：电视信号数字上变频的系统和方法
公开(公告)号：US20050041802A1
公开(公告)日：2005-02-24
申请号：US10826281
申请日：2004-04-19
申请人： Ramon Gomez , Donald McMullin
发明人： Ramon Gomez , Donald McMullin
IPC分类号： H03D7/16 , H04L29/06 , H04N7/10 , H04K1/10
CPC分类号： H04L63/04 , H03D7/161 , H04L63/062 , H04L63/08 , H04L63/123 , H04N7/10
摘要： Systems and methods for digital upconversion of baseband television signals that can be used in cable television headend systems are provided. In one embodiment, the system includes a digital frequency adjustment system and a digital to analog conversion system. In a feature of the embodiment, the digital frequency adjustment system consists of set of digital upconversion and upsample elements that shift upwards the frequency of baseband signals. In a further feature of the embodiment, a tree structure of sets of upsample and upconversion elements is used. In another embodiment, the system includes digital and analog frequency adjustment systems in which the frequencies of the input signals are partially upshifted within both the digital and analog domains. Methods for digital upconversion of television signals are also provided.
摘要翻译：提供了可用于有线电视头端系统的基带电视信号的数字上变频的系统和方法。在一个实施例中，该系统包括数字频率调整系统和数模转换系统。在该实施例的特征中，数字频率调整系统包括一组数字上变频和向上移动基带信号频率的上采样元件。在该实施例的另一特征中，使用上采样和上转换元件组的树结构。在另一个实施例中，该系统包括数字和模拟频率调整系统，其中输入信号的频率在数字和模拟域内部分升高。还提供了电视信号数字上变频的方法。

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