公开(公告)号：US06747494B2

公开(公告)日：2004-06-08

申请号：US10077467

申请日：2002-02-15

申请人： Thomas P. Bushey ,  Jeremy W Moore ,  Morgan Fitzgibbon

发明人： Thomas P. Bushey ,  Jeremy W Moore ,  Morgan Fitzgibbon

IPC分类号： H03L706

CPC分类号： H03L7/0895

摘要： A charge pump arrangement for a phase-locked-loop has a current source circuit (60) which provides charging current to the phase locked loop, and a current sink circuit (90) which depletes charging current from the phase locked loop. The current source circuit (60) and the current sink circuit (90) have slew rates which have a predetermined relationship. In this way, the charge pump causes substantially no non-linear charge injection in the phase-locked-loop. Cascoded current mirrors (75, 85) are utilised to provide a high voltage with thin gate oxide technology. The arrangement has a relatively small die size. Since bias currents of the arrangement are mirrored according to the output current required, improved transient times are produced, leading to reduced phase noise.

摘要翻译： 用于锁相环的电荷泵装置具有向锁相环提供充电电流的电流源电路（60）和从锁相环消耗充电电流的电流吸收电路（90）。 电流源电路（60）和电流吸收电路（90）具有预定关系的转换速率。 以这种方式，电荷泵在锁相环中基本上不引起非线性电荷注入。 Cascoded电流镜（75,85）用于提供具有薄栅极氧化物技术的高电压。 该布置具有相对较小的管芯尺寸。 由于该装置的偏置电流根据所需的输出电流进行镜像，因此产生改善的瞬态时间，导致相位噪声的降低。

公开(公告)号：US20090128242A1

公开(公告)日：2009-05-21

申请号：US11914876

申请日：2005-05-26

申请人： Morgan Fitzgibbon

发明人： Morgan Fitzgibbon

IPC分类号： H03L7/00

CPC分类号： H03L7/1976 ,  H03L7/0898

摘要： A wireless communication unit comprises a frequency generation circuit employing a fractional-based synthesiser, a voltage controlled oscillator circuit and a charge pump. A characterising function characterises a charge pump gain at a number of synthesized frequencies. A memory element is arranged to store characterised parameters. A scaling function is operably coupled to the memory element and the voltage controlled oscillator circuit and arranged to compensate for Kv/N variation over a tuning line voltage applied to the voltage controlled oscillator circuit, at a synthesized frequency.In this manner, the bandwidth (open loop gain) of a Phase Locked Loop remains relatively constant, to ensure the phase noise and lock time performance of the transmitter is better than 50 μsec and the Rx performance is better than 125 μs. Advantageously, only one loop filter is required to cover both Rx and Tx modes of operation.

摘要翻译： 无线通信单元包括采用基于分数的合成器，压控振荡器电路和电荷泵的频率产生电路。 表征功能表征了多个合成频率下的电荷泵增益。 存储元件布置成存储特征参数。 缩放功能可操作地耦合到存储器元件和压控振荡器电路，并被布置成以合成频率补偿施加到压控振荡器电路的调谐线电压上的Kv / N变化。 以这种方式，锁相环的带宽（开环增益）保持相对恒定，以确保发射机的相位噪声和锁定时间性能优于50个音箱，Rx性能优于125μs。 有利地，仅需要一个环路滤波器来覆盖Rx和Tx操作模式。