公开(公告)号：US08803622B1

公开(公告)日：2014-08-12

申请号：US13629732

申请日：2012-09-28

Applicant: Integrated Device Technology, Inc.

Inventor： Minhui Yan ,  Chien-Chen Chen ,  Harmeet Bhugra

IPC: H03B5/36

CPC classification number: H03B5/36 ,  H03B5/06

Abstract: Oscillator circuits include a MEMs resonator, a variable impedance circuit (e.g., varistor) and an adjustable gain amplifier. The variable impedance circuit includes a first terminal electrically coupled to a first terminal of the MEMs resonator and the adjustable gain amplifier is electrically coupled to the variable impedance circuit. The adjustable gain amplifier may have an input terminal electrically coupled to the variable impedance circuit and a second terminal of the MEMs resonator may receive, as feedback, a signal derived from an output of the adjustable gain amplifier. A Q-factor control circuit may be provided, which is configured to drive the variable impedance circuit and the adjustable gain amplifier with first and second control signals, respectively, that cause an impedance of the variable impedance circuit and a gain of the adjustable gain amplifier to be relatively high during a start-up time interval and relatively low during a post start-up time interval.

Abstract translation: 振荡器电路包括MEM谐振器，可变阻抗电路（例如，变阻器）和可调增益放大器。 可变阻抗电路包括电耦合到MEM谐振器的第一端子的第一端子，并且可调增益放大器电耦合到可变阻抗电路。 可调增益放大器可以具有电耦合到可变阻抗电路的输入端子，并且MEM谐振器的第二端子可以接收从可调增益放大器的输出导出的信号作为反馈。 可以提供Q因子控制电路，其被配置为分别引起可变阻抗电路的阻抗和可调增益放大器的增益的第一和第二控制信号驱动可变阻抗电路和可调增益放大器 在启动时间间隔期间相对较高，并且在后启动时间间隔期间相对较低。

公开(公告)号：US08847628B1

公开(公告)日：2014-09-30

申请号：US13631933

申请日：2012-09-29

Applicant: Integrated Device Technology, Inc.

Inventor： Minhui Yan ,  Chien-Chen Chen ,  Harmeet Bhugra

IPC: H03K19/094 ,  H04L25/02

CPC classification number: H03K19/09432 ,  H04L25/0272

Abstract: Integrated circuit devices may utilize automatic methods for adjusting the tail currents of current mode logic (CML) cells, which compensate for variations in process corners and thereby enable reliable operation of high performance circuits, such as frequency synthesizers. An integrated circuit may include a current mode logic (CML) circuit responsive to at least one input signal and a variable current source electrically coupled to the CML circuit. This variable current source can be configured to sink (or source) a first current from (or to) the CML circuit in response to a control signal. A control circuit may also be provided, which is configured to generate the control signal in response to a process corner indication signal. This process corner indication signal, which may be generated by a process corner detection circuit, preferably has a magnitude that estimates a relative speed of a process corner associated with the integrated circuit device.

Abstract translation: 集成电路器件可以利用自动方法来调整电流模式逻辑（CML）单元的尾部电流，其补偿过程角的变化，从而使诸如频率合成器之类的高性能电路的可靠操作。 集成电路可以包括响应于至少一个输入信号的电流模式逻辑（CML）电路和电耦合到CML电路的可变电流源。 该可变电流源可以被配置为响应于控制信号吸收（或源）来自（或到）CML电路的第一电流。 还可以提供控制电路，其被配置为响应于处理转角指示信号而产生控制信号。 可以由过程拐角检测电路产生的该过程拐角指示信号优选地具有估计与集成电路器件相关联的过程角的相对速度的幅度。