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1. 发明授权

US5859558A Low voltage analog front end 失效
标题翻译：低压模拟前端
公开(公告)号：US5859558A
公开(公告)日：1999-01-12
申请号：US827855
申请日：1997-04-11
申请人： Ricky Y. Chen , Lloyd F. Linder , Don C. Devendorf
发明人： Ricky Y. Chen , Lloyd F. Linder , Don C. Devendorf
IPC分类号： H03D7/14 , H03F3/343 , H03F3/45 , G06G7/12
CPC分类号： H03F3/45071 , H03D7/1408 , H03D7/1433 , H03D7/1441 , H03D7/1458 , H03D7/1491 , H03F3/343 , H03D2200/0033 , H03D2200/0043
摘要： A low voltage analog front end (AFE) includes a differential transistor pair which converts an input voltage, typically A.C.-coupled to the pair's control inputs, to a differential current. Impedance networks connected to each transistor's control input are joined together at a common node, and a current source is connected to the node which causes DC bias currents to be mirrored through the pair's current circuits, so that the AFE's differential output current comprises a differential current produced by the pair in response to an input voltage and superimposed on the DC bias currents. The current source preferably generates mirrored currents which are larger than its reference current to linearize the pair's response and to provide the AFE with a wide dynamic range. An input to the AFE sees a low impedance which is about equal to the sum of the impedance networks, which can be resistive or complex as needed. The AFE has widespread application as a front end circuit, serving as a low voltage input stage for a Gilbert mixer, for example. By generating bias currents via the pair's control inputs, supply voltage headroom requirements are reduced, improving a system's dynamic range and/or enabling the use of lower voltage power supplies. The AFE can be configured as either a differential or single-ended voltage-to-differential current converter.
摘要翻译：低电压模拟前端（AFE）包括差分晶体管对，其将输入电压（通常与耦合到对的控制输入的交流耦合）转换为差分电流。连接到每个晶体管的控制输入的阻抗网络在公共节点处连接在一起，并且电流源连接到节点，其导致DC偏置电流通过该对电流电路被镜像，使得AFE的差分输出电流包括差分电流由输出电压响应输入电压产生并叠加在直流偏置电流上。电流源优选地产生大于其参考电流的镜像电流，以使对的响应线性化并为AFE提供宽的动态范围。 AFE的输入端看到一个低阻抗，大约等于阻抗网络的总和，根据需要可以阻抗或复杂。 AFE作为前端电路广泛应用，例如用作Gilbert混频器的低电压输入级。通过经由该对的控制输入产生偏置电流，降低了电源电压余量要求，提高系统的动态范围和/或使能低电压电源。 AFE可以配置为差分或单端电压 - 差分电流转换器。

2. 发明授权

US06040731A Differential pair gain control stage 失效
标题翻译：差分对增益控制级
公开(公告)号：US06040731A
公开(公告)日：2000-03-21
申请号：US848930
申请日：1997-05-01
申请人： Ricky Y. Chen , Lloyd F. Linder , Don C. Devendorf , Matthew S. Gorder
发明人： Ricky Y. Chen , Lloyd F. Linder , Don C. Devendorf , Matthew S. Gorder
IPC分类号： H03G3/10 , H03D7/14 , H03G1/00 , H03G1/04 , H03G3/02 , G06F7/44 , H03L5/00
CPC分类号： H03G1/0023 , H03D7/1408 , H03D7/1433 , H03D7/1441 , H03D7/1458 , H03D7/1491 , H03D2200/0025 , H03D2200/0047
摘要： A "gain control differential pair" (GCDP) conducts current in response to a differential drive signal, with the gain of a signal path formed via the current circuit of one of its transistors controlled by the drive signal. The GCDP is preferably driven with a drive circuit that receives a symmetrical input signal and produces an offset differential drive signal which has the effect of keeping one of the GCDP's transistors turned off over a wider portion of a symmetrical input signal's voltage range, thereby reducing GCDP-caused noise. One or more GCDPs are implemented as part of a Gilbert mixer to regulate the amount of RF current that flows between the mixer's output and input stages, which eliminates the need to provide gain control in other circuits fed by the mixer. When driven with an offset drive signal, the Gilbert mixer simultaneously provides gain control, low distortion, low power consumption and excellent LO/RF isolation.
摘要翻译： “增益控制差动对”（GCDP）响应于差分驱动信号传导电流，其中通过其驱动信号控制的晶体管的一个晶体管的电流电路形成的信号通路的增益。 GCDP优选地被驱动电路驱动，该驱动电路接收对称的输入信号并产生偏移差分驱动信号，其具有在对称输入信号的电压范围的较宽部分上保持GCDP晶体管中的一个截止的效果，由此降低GCDP 有噪音一个或多个GCDP被实现为Gilbert混频器的一部分，以调节在混频器的输出和输入级之间流动的RF电流的量，这消除了在由混频器馈送的其它电路中提供增益控制的需要。当利用偏移驱动信号驱动时，Gilbert混频器同时提供增益控制，低失真，低功耗和优异的LO / RF隔离。

3. 发明授权

US6118811A Self-calibrating, self-correcting transceivers and methods 失效
标题翻译：自校准，自校正收发器和方法
公开(公告)号：US6118811A
公开(公告)日：2000-09-12
申请号：US903807
申请日：1997-07-31
申请人： Robert T. Narumi , Lloyd F. Linder , Erick M. Hirata , Don C. Devendorf , Matthew S. Gorder , Phung N. Phan , Ricky Y. Chen
发明人： Robert T. Narumi , Lloyd F. Linder , Erick M. Hirata , Don C. Devendorf , Matthew S. Gorder , Phung N. Phan , Ricky Y. Chen
IPC分类号： H04B1/40 , H04B17/00 , H04B1/38
CPC分类号： H04B1/40 , H04B17/14 , H04B17/20 , H04B17/21
摘要： A transceiver has a digital signal processor which can insert calibration signals of known level and frequency into transmitters for calibration and correction of transmitter parameters. An output of the calibrated and corrected transmitter is subsequently coupled into a calibration mixer along with a mixing signal (e.g., from a local oscillator generator. The outputs of the calibration mixer have known levels and frequencies and are inserted into receivers for calibration and correction of receiver parameters.
摘要翻译：收发器具有数字信号处理器，其可以将已知电平和频率的校准信号插入到发射机中用于校准和校正发射机参数。校准和校正的发射机的输出随后与混合信号（例如，从本地振荡器发生器）耦合到校准混频器中。校准混频器的输出具有已知的电平和频率，并被插入接收器中用于校准和校正接收机参数。

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