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    • 5. 发明授权
    • Low IF radio receiver
    • 低IF无线电接收机
    • US08189717B2
    • 2012-05-29
    • US12705836
    • 2010-02-15
    • Nadim KhlatConor O'KeefePatrick J. Pratt
    • Nadim KhlatConor O'KeefePatrick J. Pratt
    • H03K9/00H04L27/00
    • H03D7/166H03D3/002H03D2200/0078H03D2200/0082
    • A slot-based radio signal at a carrier frequency is received, the radio signal including successive frames, each frame including a set of reception time slots, to producing an input signal. A local oscillator signal is produced, In-phase and Quadrature components having a local oscillator frequency. The input signal is mixed with the local oscillator signal and Intermediate Frequency signal In-phase and Quadrature components are produced. The local oscillator frequency of the local oscillator signal changes relative to the carrier frequency of the input signal multiple times during the reception time slots of each of the frames between two frequency values. One frequency is greater and the other frequency is smaller than the carrier frequency. Frequencies of Intermediate Frequency components are selectively passed within a low Intermediate Frequency range and frequencies outside said low Intermediate Frequency range are rejected so as to produce filtered signal components.
    • 接收载波频率的基于时隙的无线电信号,该无线电信号包括连续帧,每帧包括一组接收时隙,以产生输入信号。 产生本地振荡器信号,具有本地振荡器频率的同相和正交分量。 输入信号与本地振荡器信号混合,产生中频信号同相和正交分量。 在两个频率值之间的每个帧的接收时隙期间,本地振荡器信号的本地振荡器频率相对于输入信号的载波频率多次改变。 一个频率较大,另一个频率小于载波频率。 中频分量的频率在低中频范围内选择性地通过,并且拒绝所述低中频范围外的频率,以产生滤波信号分量。
    • 8. 发明申请
    • SWITCHED-CAPACITOR HARMONIC-REJECT MIXER
    • 开关电容谐波抑制混频器
    • US20160190987A1
    • 2016-06-30
    • US14584942
    • 2014-12-29
    • SYNAPTICS INCORPORATED
    • Eric Scott BOHANNONSteve Chikin LO
    • H03D7/14G06F3/041G06F3/044
    • G06F3/0412G06F3/0416G06F3/044H03D7/1466H03D2200/0078H03D2200/0086
    • Disclosed herein are techniques related to a discrete-time harmonic rejection mixer. The discrete-time harmonic rejection mixer includes a switched-capacitor network and a switch controller. The switched-capacitor network includes first, second, and third switched capacitor sub-circuits, each including a pair of capacitors and a set of switches. The switch controller is coupled to the switched-capacitor network, and is configured to operate the sets of switches. More specifically, the switch controller is configured to operate the sets of switches in an out of phase manner to produce the harmonic rejection effect. Capacitance values for the first pair of capacitors are roughly equal to capacitance values for the third pair of capacitors. An input device, method, and harmonic rejection circuit exhibiting the above features are provided as examples.
    • 这里公开的是与离散时间谐波抑制混频器有关的技术。 离散时间谐波抑制混频器包括开关电容网络和开关控制器。 开关电容器网络包括第一,第二和第三开关电容器子电路,每个包括一对电容器和一组开关。 开关控制器耦合到开关电容器网络,并且被配置为操作该组开关。 更具体地,开关控制器被配置为以异相方式操作开关组,以产生谐波抑制效应。 第一对电容器的电容值大致等于第三对电容器的电容值。 作为示例提供了具有上述特征的输入装置,方法和谐波抑制电路。
    • 9. 发明授权
    • Sigma-delta FM demodulator
    • Sigma-delta FM解调器
    • US5448202A
    • 1995-09-05
    • US271049
    • 1994-07-06
    • Jeffrey R. Owen
    • Jeffrey R. Owen
    • H03M3/02H03D3/00H04L27/156H03D3/18
    • H03D3/006H03D2200/005H03D2200/0054H03D2200/0064H03D2200/0078
    • Digital frequency demodulation is accomplished by monitoring similar transitions in an FM radio signal to determine frequency. Time intervals between similar transitions in the FM signal are established by selecting anticipated transition times and accumulating error values relative to actual transition times. Accumulated error values provide a basis for further selecting anticipated transition times in such manner that a reported sequence of anticipated transition times provides a basis for inferring signal frequency. In one illustrated embodiment, the chosen transition times are positive transitions in the FM signal and the anticipated times of transition are taken from a set of two time periods, an early transition and a late transition relative to a valid transition window. In one embodiment of the invention, accumulated error is stored in an integrator device while in another embodiment accumulated error is stored in the phase of a bi-frequency oscillator. By reporting the selected anticipation times by associated values in a digital bit stream, frequency may be inferred by computing a ratio of given digital values in the bit stream relative to the total number of samples in the bit stream.
    • 通过监视FM无线电信号中的类似转换来确定频率来实现数字频率解调。 通过选择预期的转换时间并相对于实际的转换时间积累误差值来建立FM信号中相似转换之间的时间间隔。 累积误差值提供了进一步选择预期转换时间的基础,使得所报告的预期转换时间序列提供了推断信号频率的基础。 在一个示出的实施例中,所选择的转换时间是FM信号中的正转换,并且转换的预期时间取自于一组两个时间段,即相对于有效转换窗口的早期转换和后期转换。 在本发明的一个实施例中,累积误差被存储在积分器装置中,而在另一实施例中,累积误差被存储在双频振荡器的相位中。 通过在数字比特流中通过相关联的值报告所选择的预期时间,可以通过计算比特流中给定的数字值相对于比特流中的总样本的比率来推断频率。
    • 10. 发明申请
    • IMPROVED SIGMA-DELTA FM DEMODULATOR
    • 改进的SIGMA-DELTA调频解调器
    • WO1996001525A1
    • 1996-01-18
    • PCT/IB1995000579
    • 1995-07-06
    • SEIKO COMMUNICATIONS HOLDING N.V.
    • SEIKO COMMUNICATIONS HOLDING N.V.OWEN, Jeffrey, R.
    • H03D03/00
    • H03D3/006H03D2200/005H03D2200/0054H03D2200/0064H03D2200/0078
    • Digital frequency demodulation is accomplished by monitoring similar transitions in an FM radio signal to determine frequency. Time intervals between similar transitions in the FM signal are established by selecting anticipated transition times and accumulating error values relative to actual transition times. Accumulated error values provide a basis for further selecting anticipated transition times in such manner that a reported sequence of anticipated transition times provides a basis for inferring signal frequency. In one illustrated embodiment, the chosen transition times are positive transitions in the FM signal and the antipicated times of transition are taken from a set of two time periods, an early transition and a late transition relative to a valid transition window. In one embodiment of the invention, accumulated error is stored in an integrator device while in another embodiment accumulated error is stored in the phase of a bi-frequency oscillator. By reporting the selected anticipation times by associated values in a digital bit stream, frequency may be inferred by computing a ratio of given digital values in the bit stream relative to the total number of samples in the bit stream.
    • 通过监视FM无线电信号中的类似转换来确定频率来实现数字频率解调。 通过选择预期的转换时间并相对于实际的转换时间积累误差值来建立FM信号中相似转换之间的时间间隔。 累积误差值提供了进一步选择预期转换时间的基础,使得所报告的预期转换时间序列提供了推断信号频率的基础。 在一个示出的实施例中,所选择的转换时间是FM信号中的正转换,并且转换的反转时间取自于一组两个时间段,即相对于有效转换窗口的早期转换和后期转换。 在本发明的一个实施例中,累积误差被存储在积分器装置中,而在另一实施例中,累积误差被存储在双频振荡器的相位中。 通过在数字比特流中通过相关联的值报告所选择的预期时间,可以通过计算比特流中给定的数字值相对于比特流中的总样本的比率来推断频率。