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    • 1. 发明授权
    • Phase lock detector
    • 锁相检测器
    • US5734273A
    • 1998-03-31
    • US404511
    • 1995-03-15
    • Mark Stephen John Mudd
    • Mark Stephen John Mudd
    • H03L7/095H03L7/06
    • H03L7/095Y10S331/02
    • A phase lock detector for a digital phase locked loop frequency synthesiser in which phase errors, represented by phase error pulses of a duration equal to the relative time displacement of synthesised and reference waveforms in the phase locked loop, are compared with a predetermined time interval representing the maximum phase error acceptable in a phase-lock condition. A favourable result of the comparison may be required to persist for a predetermined time before a phase-lock indication is given, to avoid jitter or flicker of that indication in a near-lock situation.
    • 一种用于数字锁相环频率合成器的相位锁定检测器,其中将相位误差表示为相位误差,该相位误差的持续时间等于锁相环中的合成和参考波形的相对时间位移的持续时间等于预定的时间间隔, 在相位锁定状态下可接受的最大相位误差。 可能需要比较的有利结果在给定相位锁定指示之前持续预定时间,以避免在接近锁定情况下该指示的抖动或闪烁。
    • 2. 发明授权
    • Radio frequency tuner front end and tuner
    • 射频调谐器前端和调谐器
    • US07437133B2
    • 2008-10-14
    • US10247952
    • 2002-09-20
    • Mark Stephen John MuddNicholas Paul Cowley
    • Mark Stephen John MuddNicholas Paul Cowley
    • H04B1/18
    • H03J5/244
    • A front end for a radio frequency tuner, for example for connection to a cable distribution network, including an input connected to a signal path comprising an LNA connected via an AGC stage to a signal splitter. The input path has a bandwidth sufficiently wide to pass all of the channels in an input signal and has a substantially constant voltage standing wave ratio over the bandwidth. The splitter supplies identical signals to several filtering paths, each of which comprises a fixed filter. The paths are selectable one at a time and the filters divide the input frequency band into a plurality of contiguous or slightly overlapping sub-bands. The output of the front end is supplied to, for example, a double conversion arrangement comprising an upconverter and a downconverter with first and second IF filters.
    • 用于射频调谐器的前端,例如用于连接到电缆分配网络,包括连接到包括经由AGC级连接到信号分离器的LNA的信号路径的输入。 输入路径具有足够宽的带宽以通过输入信号中的所有通道,并且在带宽上具有基本恒定的电压驻波比。 分离器将相同的信号提供给多个滤波路径,每个滤波路径包括固定滤波器。 路径可以一次一个地选择,并且滤波器将输入频带划分为多个连续的或稍微重叠的子带。 前端的输出被提供到例如包括上变频器和下变频器的双转换装置,其具有第一和第二IF滤波器。