公开(公告)号：WO2006087506A1

公开(公告)日：2006-08-24

申请号：PCT/GB2005/050151

申请日：2005-09-12

Applicant: Frontier Silicon Limited ,  LUFF, Gwilym Francis ,  TROOP, Nicholas Mark ,  TUNCER, Sencan ,  EDDOWES, David

Inventor： LUFF, Gwilym Francis ,  TROOP, Nicholas Mark ,  TUNCER, Sencan ,  EDDOWES, David

IPC: H03D7/16 ,  H04H1/00

CPC classification number: H03J5/244 ,  H03J1/005 ,  H03J2200/10 ,  H04B1/0064 ,  H04B1/0078 ,  H04B1/0082 ,  H04H40/18 ,  H04H2201/20

Abstract: This invention relates to improved architectures for digital audio broadcast (DAB) receivers, in particular multiband DAB receivers. A digital audio broadcast (DAB) receiver, the receiver comprising: an rf input to receive rf signals in at least two receive frequency bands; a local oscillator having a local oscillator signal output; a mixer having inputs coupled to said rf input and to said local oscillator and having an output to provide an IF frequency signal; and an output to provide an output signal from said IF frequency signal; and wherein said local oscillator comprises a phase locked loop (PLL) including a tunable voltage controlled oscillator (VCO) and a programmable divider coupled to an output of said voltage controlled oscillator to provide said local oscillator signal output; at least one of said two receive frequency bands being associated with a plurality of different division ratios of said programmable divider; wherein said voltage controlled oscillator (VCO) has a plurality of selectable VCO frequency bands; and wherein said local oscillator further comprises a VCO band selector to select a said VCO frequency band; whereby said at least two receive frequency bands are covered by said receiver by a combination of said VCO band selection and said plurality of different division ratios.

Abstract translation: 本发明涉及用于数字音频广播（DAB）接收机，特别是多频带DAB接收机的改进的架构。 一种数字音频广播（DAB）接收机，所述接收机包括：用于在至少两个接收频带中接收rf信号的rf输入; 具有本地振荡器信号输出的本地振荡器; 混频器，具有耦合到所述RF输入和所述本地振荡器并具有输出以提供IF频率信号的输入; 以及输出，用于提供来自所述IF频率信号的输出信号; 并且其中所述本地振荡器包括锁相环（PLL），所述锁相环包括可调谐压控振荡器（VCO）和耦合到所述压控振荡器的输出的可编程分频器，以提供所述本地振荡器信号输出; 所述两个接收频带中的至少一个与所述可编程分频器的多个不同分频比相关联; 其中所述压控振荡器（VCO）具有多个可选择的VCO频带; 并且其中所述本地振荡器还包括选择所述VCO频带的VCO频带选择器; 由此所述至少两个接收频带由所述接收机通过所述VCO频带选择和所述多个不同分频比的组合来覆盖。

公开(公告)号：WO2006085046A1

公开(公告)日：2006-08-17

申请号：PCT/GB2005/050150

申请日：2005-09-12

Applicant: Frontier Silicon Limited ,  LUFF, Gwilym Francis

Inventor： LUFF, Gwilym Francis

IPC: H04B1/28 ,  H03D7/16

CPC classification number: H04B1/28 ,  H03D7/1433 ,  H03D7/1441 ,  H03D7/1458 ,  H03D7/1483 ,  H03D7/165 ,  H03D2200/0025

Abstract: This invention relates to apparatus and methods for radio receivers, in particular low (IP) frequency receivers. Embodiments of the invention are particularly suitable for digital audio broadcast receivers. A low-IF radio receiver circuit, the circuit comprising: an rf input (202) for a received rf signal: a first local oscillator (208) having a quadrature output to provide a quadrature first local oscillator signal at a first frequency; a quadrature first mixer (206) coupled to said rf input and to said quadrature output of said first local oscillator and having a quadrature first mixer output, and said first mixer and said first local oscillator being configured to provide quadrature mixing of said quadrature first local oscillator signal and said received rf signal to downconvert said received rf signal to a first quadrature IF signal at a first IF frequency; a bandpass filter (210) coupled to said quadrature first mixer output and having a filtered output to provide a bandpass filtered first IF signal; a second local oscillator (214) having a second local oscillator ourput to provide a second local oscillator signal at a second frequency; a second mixer (212) coupled to said filtered output of said bandpass filter and to said second local oscillator and having a second mixer ouput, said second mixer and said second local oscillator being configured to provide mixing of said second local oscillator signal and said bandpass filtered first IF signal to upconvert said bandpass filtered first IF signal to a second IF signal at a second IF freqquency , wherein said second IF frequency is greater than said first IF frequency; and an output coupled to said second mixer output to provide an output signal from said second IF signal.

Abstract translation: 本发明涉及无线电接收机，特别是低（IP）频率接收机的装置和方法。 本发明的实施例特别适用于数字音频广播接收机。 一种低IF无线电接收机电路，所述电路包括：用于接收的rf信号的rf输入（202）：具有正交输出的第一本地振荡器（208），以提供第一频率的正交第一本地振荡器信号; 耦合到所述第一本地振荡器的所述rf输入和所述正交输出的正交第一混频器（206），并具有正交第一混频器输出，所述第一混频器和所述第一本地振荡器被配置为提供所述正交第一局部 振荡器信号和所述接收的rf信号，以将所接收的rf信号以第一IF频率下转换成第一正交IF信号; 耦合到所述正交第一混频器输出并且具有滤波输出以提供带通滤波的第一IF信号的带通滤波器（210） 具有第二本机振荡器的第二本地振荡器（214），用于以第二频率提供第二本地振荡器信号; 耦合到所述滤波器输出的所述带通滤波器和所述第二本机振荡器并具有第二混频器输出的第二混频器（212），所述第二混频器和所述第二本机振荡器被配置为提供所述第二本机振荡器信号和所述带通 经过滤波的第一IF信号，以第二IF频率将所述带通滤波的第一IF信号上变频到第二IF信号，其中所述第二IF频率大于所述第一IF频率; 以及耦合到所述第二混频器输出以提供来自所述第二IF信号的输出信号的输出。

公开(公告)号：WO2006032932A1

公开(公告)日：2006-03-30

申请号：PCT/GB2005/050149

申请日：2005-09-12

Applicant: FRONTIER SILICON LIMITED ,  TROOP, Nicholas Mark

Inventor： TROOP, Nicholas Mark

IPC: H03F1/56

CPC classification number: H03F3/4508 ,  H03F1/565 ,  H03F3/19 ,  H03F2200/294 ,  H03F2200/372 ,  H03F2203/45512 ,  H03F2203/45554 ,  H03F2203/45556 ,  H03F2203/45562

Abstract: This invention generally relates to radio frequency circuits, more particularly to circuits such as amplifier circuits, having a high dynamic range. Embodiments of the invention are particularly suitable for use in the front end of a Broadcast Radio Receiver such as a digital audio broadcast (DAB) receiver. An rf amplifier circuit, the circuit comprising: first and second inputs; at least one output; first and second inductors each having first and second connections, said first connections of said first and second inductors being respectively coupled to said first and second inputs; first and second transistors, each having at least a control connection., an input connection and an output connection, said input connections of said first and second transistors being respectively coupled to said second connections of said first and second inductors, said control connections of said first and second transistors each having a bias, and at least one of said output connections of said first and second transistors being coupled to said at least one output; and wherein said control connections of said first transistors is capacitatively coupled to said first inductor of said second inductor and said control connection of said second transistors is capacitively coupled to said first connection of said first inductor.

Abstract translation: 本发明一般涉及射频电路，更具体地说涉及具有高动态范围的诸如放大器电路的电路。 本发明的实施例特别适用于诸如数字音频广播（DAB）接收机的广播无线电接收机的前端。 一种RF放大器电路，该电路包括：第一和第二输入; 至少一个输出; 第一和第二电感器各自具有第一和第二连接，所述第一和第二电感器的所述第一连接分别耦合到所述第一和第二输入; 第一和第二晶体管，每个具有至少一个控制连接，输入连接和输出连接，所述第一和第二晶体管的所述输入连接分别耦合到所述第一和第二电感器的所述第二连接，所述控制连接 第一和第二晶体管各自具有偏置，并且所述第一和第二晶体管的所述输出连接中的至少一个耦合到所述至少一个输出; 并且其中所述第一晶体管的所述控制连接电容耦合到所述第二电感器的所述第一电感器，并且所述第二晶体管的所述控制连接电容耦合到所述第一电感器的所述第一连接。

公开(公告)号：WO2013153381A1

公开(公告)日：2013-10-17

申请号：PCT/GB2013/050920

申请日：2013-04-10

Applicant: FRONTIER SILICON LIMITED

Inventor： TANG-RICHARDSON, Mel ,  EMERSON, Christopher Michael

IPC: H04L27/26

CPC classification number: H04L27/2678 ,  H04L27/2663 ,  H04L27/2671 ,  H04L27/2685

Abstract: The present invention provides a method and apparatus for detecting a broadcast OFDM signal. The present invention utilise the property of the OFDM symbol in that it contains highly correlated (guard interval) and highly uncorrelated (rest of the symbol) portions. The present invention checks for correlation in the guard interval and lack of correlation outside the guard interval to identify whether or not a received signal is of OFDM construction.

Abstract translation: 本发明提供一种用于检测广播OFDM信号的方法和装置。 本发明利用OFDM符号的属性，因为它包含高度相关（保护间隔）和高度不相关（其余的符号）部分。 本发明检查保护间隔中的相关性和保护间隔之外的相关性不足以识别接收信号是否是OFDM结构。

公开(公告)号：WO2006087508A1

公开(公告)日：2006-08-24

申请号：PCT/GB2005/050153

申请日：2005-09-12

Applicant: Frontier Silicon Limited ,  TAYLOR, Clive Roland

Inventor： TAYLOR, Clive Roland

IPC: H03K17/16

CPC classification number: H03L7/0895

Abstract: This invention relates to improved charge pump circuits for use particularly with phase locked loops (PLLs). Applications of embodiments of the invention include an improved PLL for a digital audio broadcast (DAB) receiver. A charge pump circuit for a phase locked loop, the circuit comprising: a current generator (P11); a current mirror (N2, N3, N7) having an input (404) coupled to said current generator, said current mirror having at least two series connected output transistors (N3, N7); and a charge pump output (402) coupled to at least one of said output transistors; the circuit having an on-state in which an output current is provided and an off-state in which substantially no output current is provided; the charge pump circuit further comprising; at least one switching device (N4) to switch said circuit between said on-state and said-off state by controlling a first (N3) of said output transistors; and a biasing circuit (N1, N6) to bias a second (N7) of said output transistors into an on-state when said charge pump circuit is in said off-state.

Abstract translation: 本发明涉及特别用于锁相环（PLL）的改进的电荷泵电路。 本发明的实施例的应用包括用于数字音频广播（DAB）接收机的改进的PLL。 一种用于锁相环的电荷泵电路，所述电路包括：电流发生器（P11）; 具有耦合到所述电流发生器的输入端（404）的电流镜（N2，N3，N7），所述电流镜具有至少两个串联连接的输出晶体管（N3，N7）; 和耦合到所述输出晶体管中的至少一个的电荷泵输出（402）; 所述电路具有其中提供输出电流的导通状态和基本上不输出输出电流的截止状态; 所述电荷泵电路还包括： 至少一个开关装置（N4），用于通过控制所述输出晶体管的第一（N3）来在所述导通状态和所述断开状态之间切换所述电路; 以及当所述电荷泵电路处于所述断开状态时，将所述输出晶体管的第二（N7）偏置为导通状态的偏置电路（N1，N6）。

公开(公告)号：WO2006087507A1

公开(公告)日：2006-08-24

申请号：PCT/GB2005/050152

申请日：2005-09-12

Applicant: Frontier Silicon Limited ,  TUNCER, Sencan ,  LUFF, Gwilym Francis ,  TAYLOR, Clive Roland

Inventor： TUNCER, Sencan ,  LUFF, Gwilym Francis ,  TAYLOR, Clive Roland

IPC: H03L7/093

CPC classification number: H03L7/18 ,  H03L7/0898 ,  H03L7/099 ,  H03L7/10

Abstract: This invention relates to a phase locked loop circuit which is particularly suitable for digital audio broadcast (DAB) receiver. A phase locked loop (PLL)(128) for providing a phase locked output signal from a reference signal comprises an input to receive said reference signal; a variable frequency oscillator (132), said oscillator being operable in a selected one of a plurality of frequency bands and having a frequency control input (tune I/P) for controlling a frequency of the oscillator, and a band select input for a band select signal for selecting a said frequency band, and an output for providing said phase locked output signal; and a phase detection system (138), said phase detection system having a first input coupled to said reference signal input, a second input to receive a signal derived from said oscillator output, and an output (139) for providing a frequency control signal to said frequency control input of said oscillator; and wherein said PLL is further configured to adjust a gain of said phase detection system (138) responsive to at least one of said frequency control signal and said band select signal.

Abstract translation: 本发明涉及一种特别适用于数字音频广播（DAB）接收机的锁相环电路。 用于从参考信号提供锁相输出信号的锁相环（PLL）（128）包括用于接收所述参考信号的输入端; 可变频率振荡器（132），所述振荡器可操作在多个频带中的选定的一个频带中，并且具有用于控制振荡器的频率的频率控制输入（音调I / P）和用于频带的频带选择输入 用于选择所述频带的选择信号和用于提供所述锁相输出信号的输出; 相位检测系统（138），所述相位检测系统具有耦合到所述参考信号输入的第一输入端，用于接收从所述振荡器输出得到的信号的第二输入端和用于提供频率控制信号 所述振荡器的频率控制输入; 并且其中所述PLL还被配置为响应于所述频率控制信号和所述频带选择信号中的至少一个来调整所述相位检测系统（138）的增益。

公开(公告)号：WO2013153382A1

公开(公告)日：2013-10-17

申请号：PCT/GB2013/050921

申请日：2013-04-10

Applicant: FRONTIER SILICON LIMITED

Inventor： TANG-RICHARDSON, Mel ,  EMERSON, Christopher Michael

IPC: H04L1/20 ,  H04L27/26

CPC classification number: H04L27/2647 ,  H04L27/2678 ,  H04L27/2691

Abstract: The present invention relates to a method and apparatus for estimating the signal to noise ratio of a broadcast OFDM signal. The invention compares signals of the data in a guard interval and the corresponding part of the data frame of an OFDM symbol. A sum and difference operation is then performed on the data in the compared signals to enable a Signal to Noise Ratio to be calculated.

Abstract translation: 本发明涉及一种用于估计广播OFDM信号的信噪比的方法和装置。 本发明将保护间隔中的数据和OFDM符号的数据帧的对应部分的信号进行比较。 然后对比较的信号中的数据执行和差和差分操作，以便计算信噪比。

公开(公告)号：WO2013153380A1

公开(公告)日：2013-10-17

申请号：PCT/GB2013/050919

申请日：2013-04-10

Applicant: FRONTIER SILICON LIMITED

Inventor： TANG-RICHARDSON, Mel ,  EMERSON, Christopher Michael

IPC: H04H40/18

CPC classification number: H04H20/22

Abstract: The invention provides a broadcast receiver having a single tuner that can be tuned away from a first frequency, from which a first broadcast signal is being received, to a second frequency to detect alternative broadcast signals and tuned back to the first frequency to continue receiving the first broadcast signal without an interruption to the received service. This utilises the fact that, in systems such as OFDM systems, not all broadcast data packets within a received frame are required to be decoded in order to receive a desired broadcast service. As such, the tuner can be tuned away, detect alternative services and tuned back to the original frequency to continue receiving the first broadcast service without any perceivable break (to the user) in the reception of the first broadcast service.

Abstract translation: 本发明提供了一种具有单个调谐器的广播接收机，该单个调谐器可被远离第一个频率被从其接收第一广播信号的第二频率调谐到第二频率以检测替代的广播信号并被调谐回到第一频率以继续接收 第一广播信号而不中断所接收的服务。 这利用了在诸如OFDM系统的系统中，不需要对接收到的帧内的所有广播数据分组进行解码以便接收所需的广播服务的事实。 因此，调谐器可以被调离，检测替代服务并调谐回原始频率，以在第一广播服务的接收中继续接收第一广播服务而没有任何可察觉的中断（给用户）。

公开(公告)号：WO2013124660A1

公开(公告)日：2013-08-29

申请号：PCT/GB2013/050421

申请日：2013-02-21

Applicant: FRONTIER SILICON LIMITED

Inventor： EDDOWES, David

IPC: H03G3/30

CPC classification number: H04B17/23 ,  H03G3/3068 ,  H04B1/1027 ,  H04B1/109 ,  H04B17/21 ,  H04B17/318 ,  H04B17/345

Abstract: The invention generally relates to a method of indicating signal quality at an input to a radio receiver, and to a radio receiver. In particular, such a method is described, wherein a receiver comprises first (RF) and second (IF) gain control loops respectively using first and second gain control signals, and comprising indicating signal quality dependent on said first gain control signal and said second gain control signal. In an embodiment, a difference between the first and second gain control signals is used to indicate presence of interference and/or received signal strength.

Abstract translation: 本发明一般涉及在无线电接收机的输入和无线电接收机处指示信号质量的方法。 具体地，描述了这样的方法，其中接收机包括分别使用第一和第二增益控制信号的第一（RF）和第二（IF）增益控制回路，并且包括指示取决于所述第一增益控制信号和所述第二增益的信号质量 控制信号。 在一个实施例中，第一和第二增益控制信号之间的差异用于指示干扰和/或接收信号强度的存在。

公开(公告)号：WO2007096663A3

公开(公告)日：2007-08-30

申请号：PCT/GB2007/050054

申请日：2007-02-09

Applicant: FRONTIER SILICON LIMITED ,  MCNALLY, Conor

Inventor： MCNALLY, Conor

IPC: H03H17/04 ,  H04L25/02

Abstract: A digital filter, the filter comprising: an input to receive complex-valued input samples; an up-sampler coupled to said input to provide an up-sampled output comprising an increased number of said input samples; a filter coupled to said up-sampler to filter said up-sampled output and provide a filtered output; a phase rotation estimator coupled to said input and to said filtered output to estimate a phase rotation of a said input sample by said filter; and a phase compensator coupled to said filtered output and to said phase rotation estimator to compensate said filtered output for said estimated phase rotation.