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    • 1. 发明授权
    • Integrated multi-tuner satellite receiver architecture and associated method
    • 综合多调谐卫星接收机架构及相关方法
    • US07167694B2
    • 2007-01-23
    • US10412871
    • 2003-04-14
    • Ramin Khoini-PoorfardAndrew W. Krone
    • Ramin Khoini-PoorfardAndrew W. Krone
    • H04B7/08
    • H04N5/4446H03D3/006H03D3/007H03L7/18H04H40/90H04N5/4401H04N5/50H04N7/20H04N21/4263
    • Multi-tuner receiver architectures and associated methods are disclosed that provide initial analog coarse tuning of desired channels within a received signal spectrum, such as transponder channels within a set-top box signal spectrum for satellite communications. These multi-tuner satellite receiver architectures provide significant advantages over prior direct down-conversion (DDC) architectures and low intermediate-frequency (IF) architectures, particularly where two tuners are desired on the same integrated circuit. Rather than using a low-IF frequency or directly converting the desired channel frequency to DC, initial coarse tuning provided by analog coarse tuning circuitry allows for a conversion to a frequency range around DC. This coarse tuning circuitry can be implemented, for example, using a large-step local oscillator (LO) that provides a coarse tune analog mixing signal. Once mixed down, the desired channel may then be fine-tuned through digital processing, such as through the use of a wide-band analog-to-digital converter (ADC) or a narrow-band tunable bandpass ADC.
    • 公开了多调谐器接收机架构和相关方法,其提供在接收信号频谱内的期望信道的初始模拟粗调,例如用于卫星通信的机顶盒信号频谱内的应答器信道。 这些多调谐器卫星接收机架构提供了优于先前的直接下变频(DDC)架构和低中频(IF)架构的显着优点,特别是在同一集成电路上需要两个调谐器时。 不是使用低IF频率或直接将期望的信道频率转换为DC,而是由模拟粗调谐电路提供的初始粗调调可以转换到大约DC的频率范围。 该粗调谐电路可以例如使用提供粗调模拟混频信号的大步本地振荡器(LO)来实现。 一旦混合,则可以通过数字处理(例如通过使用宽带模数转换器(ADC)或窄带可调谐带通ADC)来微调所需的信道。
    • 7. 发明授权
    • Receiver architectures utilizing coarse analog tuning and associated methods
    • 采用粗略模拟调谐和相关方法的接收机架构
    • US07340230B2
    • 2008-03-04
    • US10412963
    • 2003-04-14
    • Ramin Khoini-PoorfardAndrew W. Krone
    • Ramin Khoini-PoorfardAndrew W. Krone
    • H04B7/08
    • H04N5/4446H03D3/006H03D3/007H03L7/18H04H40/90H04N5/4401H04N5/50H04N7/20H04N21/4263
    • Receiver architectures and associated methods are disclosed that provide initial analog coarse tuning of desired channels within a received signal spectrum, such as a set-top box signal spectrum for satellite communications. These architectures provide significant advantages over prior direct down-conversion (DDC) architectures and low intermediate-frequency (IF) architectures, particularly where two tuners are desired on the same integrated circuit. Rather than using a low-IF frequency or directly converting the desired channel frequency to DC, initial coarse tuning provided by analog coarse tuning circuitry allows for a conversion to a frequency range around DC. This coarse tuning circuitry can be implemented, for example, using a large-step local oscillator (LO) that provides a coarse tune analog mixing signal. Once mixed down, the desired channel may then be fine-tuned through digital processing, such as through the use of a wide-band analog-to-digital converter (ADC) or a narrow-band tunable bandpass ADC.
    • 公开了接收机架构和相关方法,其提供接收信号频谱内的期望信道的初始模拟粗调,例如用于卫星通信的机顶盒信号频谱。 这些架构与先前的直接下变频(DDC)架构和低中频(IF)架构相比具有显着的优势,特别是在同一集成电路上需要两个调谐器的情况下。 不是使用低IF频率或直接将期望的信道频率转换为DC,而是由模拟粗调谐电路提供的初始粗调调可以转换到大约DC的频率范围。 该粗调谐电路可以例如使用提供粗调模拟混频信号的大步本地振荡器(LO)来实现。 一旦混合,则可以通过数字处理(例如通过使用宽带模数转换器(ADC)或窄带可调谐带通ADC)来微调所需的信道。
    • 9. 发明授权
    • Digital-to-analog converter with power up/down transient suppression and automatic rate switching
    • 具有上电/下拉瞬变抑制和自动速率切换功能的数模转换器
    • US06492928B1
    • 2002-12-10
    • US09908672
    • 2001-07-18
    • Jason P. RhodeJohn J. PaulosAndrew W. KroneRichard Bocock
    • Jason P. RhodeJohn J. PaulosAndrew W. KroneRichard Bocock
    • H03M166
    • H03M1/0881H03M1/66
    • Power-up and power-down transient suppression are provided for an audio digital-to-analog converter with a single ended output to prevent annoying pops which accompany switching an audio system on and off. Power-up suppression is achieved by clamping an output signal to ground, driving the audio channel to ground, releasing the clamp and driving the audio channel gradually to its quiescent (zero signal) value. Power-down suppression is provided by using a positive feedback amplifier to accelerate current drain initiated by a constant current source used to bleed off the charge on output capacitor. The audio digital-to-analog converter sets operational mode based on ratios of a master clock to a channel selection clock. The techniques disclosed apply readily to the outputs received from CDs, CD-ROMs, DAT and other digital recording media.
    • 为具有单端输出的音频数/模转换器提供上电和掉电瞬态抑制,以防止伴随音频系统开启和关闭的烦人的弹出。 通过将输出信号钳位到地,将音频通道驱动到地,释放钳位并逐渐将音频通道驱动到其静态(零信号)值来实现上电抑制。 通过使用正反馈放大器来加速由用于消除输出电容器上的电荷的恒定电流源引发的电流消耗来提供掉电抑制。 音频数/模转换器基于主时钟与频道选择时钟的比率来设置操作模式。 所公开的技术容易地应用于从CD,CD-ROM,DAT和其他数字记录介质接收的输出。