公开(公告)号：US06567025B2

公开(公告)日：2003-05-20

申请号：US10071983

申请日：2002-02-05

申请人： Richard Schreier ,  Lawrence Singer ,  Jennifer A. Lloyd

发明人： Richard Schreier ,  Lawrence Singer ,  Jennifer A. Lloyd

IPC分类号： H03M302

CPC分类号： H03M3/484 ,  H03M3/482

摘要： A multi-bit sigma-delta analog to digital converter has a quantizer, a loop filter circuit, and a digital to analog feedback circuit. The quantizer, loop filter, and digital to analog feedback circuit have a loop gain associated therewith. The quantizer and loop filter have a combined gain associated therewith. The full-scale of the digital to analog feedback circuit is varied. The combined gain of the quantizer and loop filter is also varied. More specifically, the combined gain of the quantizer and loop filter is varied in inverse proportion to the full-scale of the digital to analog feedback circuit to maintain the loop gain at a substantially constant level.

公开(公告)号：US07265628B2

公开(公告)日：2007-09-04

申请号：US11224760

申请日：2005-09-13

申请人： Jennifer A. Lloyd ,  Kimo Y. F. Tam

发明人： Jennifer A. Lloyd ,  Kimo Y. F. Tam

IPC分类号： H03F3/04

CPC分类号： G05F3/262

摘要： A margin tracking cascode current mirror system including a current mirror circuit having a current source device having a predetermined operating voltage for providing a current to a load, a cascode circuit interconnected between the current mirror and the load for controlling the output impedance of the system and for establishing a current control voltage, a cascode bias circuit for providing a forward bias to the cascode circuit, and a compound cascode bias circuit for independently controlling the slope and the offset of the current control voltage to track the predetermined operating voltage with a predetermined margin.

摘要翻译： 一种裕度跟踪共源共栅电流镜系统，包括具有电流源装置的电流镜电路，该电流源装置具有用于向负载提供电流的预定工作电压;在电流镜和负载之间互连的串联电路，用于控制系统的输出阻抗; 用于建立电流控制电压，用于向共源共栅电路提供正向偏压的共源共栅偏置电路和用于独立地控制电流控制电压的斜率和偏移以以预定余量跟踪预定工作电压的复合共源共栅偏置电路 。

公开(公告)号：US07427866B2

公开(公告)日：2008-09-23

申请号：US11224642

申请日：2005-09-12

申请人： William F. Ellersick ,  Jennifer A. Lloyd ,  Daniel J. Mulcahy

发明人： William F. Ellersick ,  Jennifer A. Lloyd ,  Daniel J. Mulcahy

IPC分类号： G01R35/00

CPC分类号： H03H7/0153 ,  H03H2210/021 ,  H03H2210/043

摘要： A system and method of calibration develops a function from which is generated a monotonic time response; a gating period is defined from the monotonic time response and any error in the frequency of a reference signal is determined during the gating period; from that error an error signal is generated for adjusting the time constant of a circuit to be calibrated.

摘要翻译： 校准的系统和方法产生一个函数，由此产生单调时间响应; 从单调时间响应定义门控周期，并且在选通期间确定参考信号频率的任何误差; 从该误差产生用于调整要校准的电路的时间常数的误差信号。