公开(公告)号：US06639946B2

公开(公告)日：2003-10-28

申请号：US09726421

申请日：2000-12-01

Applicant: Miaochen Wu ,  Aria Eshraghi ,  Theodore Tewksbury

Inventor： Miaochen Wu ,  Aria Eshraghi ,  Theodore Tewksbury

IPC: H04B1406

CPC classification number: H04B14/06 ,  H03M3/404 ,  H03M3/43 ,  H03M3/456

Abstract: A sigma delta modulation device and method for filtering high frequency intermediate frequency signals. A summing amplifier receives the analog intermediate frequency signal, and provides to a surface acoustic wave filter (SAW) an analog signal which is to be converted to a digital quantity. A quantizer digitizes the signal to produce a digitized intermediate frequency signal. A digital to analog converter provides a feedback signal from the quantizer output signal, to the summing amplifier to form a sigma delta modulation device. The SAW filter provides for high stop band attenuation of signal images within the intermediate frequency signal, and produces a low noise signal with substantially no intermodulation products.

公开(公告)号：US4990797A

公开(公告)日：1991-02-05

申请号：US412416

申请日：1989-09-26

Applicant: Peter Real ,  David H. Robertson ,  Theodore Tewksbury ,  Christopher W. Mangelsdorf

Inventor： Peter Real ,  David H. Robertson ,  Theodore Tewksbury ,  Christopher W. Mangelsdorf

IPC: G05F3/22 ,  H03K17/14

CPC classification number: H03K17/14 ,  G05F3/227

Abstract: A reference voltage distribution system for use on an integrated circuit to distribute, from a reference voltage input, to remote locations on the chip, precise images of the reference voltage. The system comprises (1) a reference buffer located proximate a reference input connection and (2) a plurality of remote generator blocks, one located at each of the remotely-located sub-blocks or circuits requiring an image of the reference voltage. The reference buffer generates from the reference voltage a number of precision currents, each proportional to the reference voltage. These precision currents are routed to the remote generator blocks. Each remote generator block converts its precision current into a precision reference voltage for local use. These latter reference voltages may be the same as or different from the reference voltage supplied to chip itself.

Abstract translation: 一种用于集成电路的参考电压分配系统，从参考电压输入到芯片上的远程位置分配参考电压的精确图像。 该系统包括（1）位于参考输入连接附近的参考缓冲器和（2）多个远程发生器模块，一个位于远程位置的子块或需要参考电压图像的电路中。 参考缓冲器从参考电压产生多个精度电流，每个精度电流与参考电压成比例。 这些精密电流被路由到远程发电机组。 每个远程发电机组将其精密电流转换为精密参考电压，以供本地使用。 这些后一参考电压可以与提供给芯片本身的参考电压相同或不同。