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1. 发明授权

US07773965B1 Calibrated quadrature very low intermediate frequency receiver 有权
标题翻译：校准正交非常低的中频接收机
公开(公告)号：US07773965B1
公开(公告)日：2010-08-10
申请号：US11534072
申请日：2006-09-21
申请人： Roger W. Van Brunt , Mark Alexander John Moffat , Steve Picken
发明人： Roger W. Van Brunt , Mark Alexander John Moffat , Steve Picken
IPC分类号： H04B17/00 , H04B1/10
CPC分类号： H04B1/30 , H03D1/2245
摘要： The present invention is a quadrature VLIF receiver, including calibration circuitry, and methods to closely match signal processing of an in-phase signal path and a quadrature-phase signal path to optimize VLIF image rejection. The calibration circuitry includes a variable gain variable-phase calibration signal generator, a variable gain amplifier for each signal path, phase adjustment circuitry for each signal path, and switching circuitry to support calibration steps. The calibration signal generator supplies a calibration signal at the same frequency as mixer local oscillator signals; therefore, during calibration, all signals downstream of the VLIF mixer are at DC, which simplifies calibration measurements, thereby minimizing calibration times.
摘要翻译：本发明是包括校准电路的正交VLIF接收机，以及用于紧密匹配同相信号路径和正交相位信号路径的信号处理以优化VLIF图像抑制的方法。校准电路包括可变增益可变相位校准信号发生器，用于每个信号路径的可变增益放大器，用于每个信号路径的相位调整电路以及支持校准步骤的开关电路。校准信号发生器以与混频器本地振荡器信号相同的频率提供校准信号; 因此，在校准期间，VLIF混合器下游的所有信号均为DC，这简化了校准测量，从而最小化校准时间。

2. 发明授权

US07593491B1 Quadrature single-mixer multi-mode radio frequency receiver 有权
标题翻译：正交单模混频多模射频接收机
公开(公告)号：US07593491B1
公开(公告)日：2009-09-22
申请号：US11538318
申请日：2006-10-03
申请人： Nadim Khlat , Marcus Granger-Jones , Mark Alexander John Moffat
发明人： Nadim Khlat , Marcus Granger-Jones , Mark Alexander John Moffat
IPC分类号： H04L27/06
CPC分类号： H04B1/30 , H04B1/406
摘要： The present invention is a quadrature multi-mode RF receiver that uses a single quadrature mixer for tuning to desired frequency bands. In a direct conversion mode of operation, the RF receiver down converts a received RF signal directly into a baseband signal. In a VLIF mode of operation, the RF receiver down converts a received RF signal into a VLIF signal. When receiving a wanted RF signal, the frequency of the resulting VLIF signal is called the wanted VLIF frequency, and is based on the signal strength of the received RF signal. In one embodiment of the present invention, the wanted VLIF frequency is selected to be one of two VLIF frequencies. The wanted VLIF frequency is inversely related to the signal strength of the received RF signal.
摘要翻译：本发明是使用单个正交混频器调谐到期望频带的正交多模式RF接收机。在直接转换操作模式中，RF接收机将接收到的RF信号直接转换成基带信号。在VLIF操作模式中，RF接收机将接收的RF信号下变频为VLIF信号。当接收到所需的RF信号时，产生的VLIF信号的频率被称为有用的VLIF频率，并且基于所接收的RF信号的信号强度。在本发明的一个实施例中，所需的VLIF频率被选择为两个VLIF频率之一。所需的VLIF频率与所接收的RF信号的信号强度成反比。

3. 发明授权

US07474715B1 Variable load circuit for reducing quadrature phase error 有权
标题翻译：用于减小正交相位误差的可变负载电路
公开(公告)号：US07474715B1
公开(公告)日：2009-01-06
申请号：US10855853
申请日：2004-05-27
申请人： Wenhai Ni , Kelvin Kai Tuan Yan , Mark Alexander John Moffat
发明人： Wenhai Ni , Kelvin Kai Tuan Yan , Mark Alexander John Moffat
IPC分类号： H03C1/52 , H03G3/12
CPC分类号： H03F3/45085 , H03F2200/336 , H03F2203/45296 , H03F2203/45466 , H03F2203/45504
摘要： A variable load circuit for adjusting a phase of a differential signal including a first transistor having a first terminal adapted to receive a first component of the differential signal, a second transistor having a first terminal adapted to receive a second component of the differential signal and a second terminal coupled to a second terminal of the first transistor, and a variable current source coupled to a third terminal of both the first and second transistors. The variable current source generates a bias current based on a control signal. For each of the first and second transistors, a first capacitance is created between the first and second terminals, and a second capacitance is created between the first and third terminals. The first and second capacitances are each a function of the bias current and thus the control signal and operate to adjust the phase of the differential signal.
摘要翻译：一种可变负载电路，用于调整差分信号的相位，该差分信号包括具有适于接收差分信号的第一分量的第一端子的第一晶体管，具有适于接收差分信号的第二分量的第一端子的第二晶体管，第二端子耦合到第一晶体管的第二端子，以及耦合到第一和第二晶体管的第三端子的可变电流源。可变电流源基于控制信号产生偏置电流。对于第一和第二晶体管中的每一个，在第一和第二端子之间产生第一电容，并且在第一和第三端子之间产生第二电容。第一和第二电容各自是偏置电流的函数，因此是控制信号并且用于调整差分信号的相位。

4. 发明授权

US07301398B1 High linearity differential transconductance amplifier 有权
标题翻译：高线性差分跨导放大器
公开(公告)号：US07301398B1
公开(公告)日：2007-11-27
申请号：US11384459
申请日：2006-03-20
申请人： Stephen Allott , Mark Alexander John Moffat
发明人： Stephen Allott , Mark Alexander John Moffat
IPC分类号： H03F3/45
CPC分类号： H03F1/3211 , H03F1/26 , H03F3/45183 , H03F3/72 , H03F2203/45201 , H03F2203/45318 , H03F2203/45384 , H03F2203/45392 , H03F2203/45506 , H03F2203/45564 , H03F2203/7203
摘要： The present invention is a differential transconductance amplifier circuit that includes matched cross-coupled transconductance elements connected such that the differential gain of the amplifier is determined by only passive elements. By virtually eliminating the effects of active elements on the amplifier gain, the amplifier operates in a very linear manner over its entire operating range. Power consumption, amplifier noise level, and dynamic range can be optimized with appropriate selection of the passive elements that determine amplifier gain.
摘要翻译：本发明是一种差分跨导放大器电路，其包括连接的匹配的交叉耦合跨导元件，使得放大器的差分增益仅由无源元件确定。通过实际消除有源元件对放大器增益的影响，放大器在整个工作范围内以非常线性的方式工作。可以通过适当选择确定放大器增益的无源元件来优化功耗，放大器噪声电平和动态范围。

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