公开(公告)号：US07589579B2

公开(公告)日：2009-09-15

申请号：US11911326

申请日：2006-04-04

Applicant: Mihai A. T. Sanduleanu ,  Eduard F. Stikvoort

Inventor： Mihai A. T. Sanduleanu ,  Eduard F. Stikvoort

IPC: H04B1/26 ,  H03K17/00

CPC classification number: H03D7/1433 ,  H03D7/1408 ,  H03D7/1425 ,  H03D7/1458 ,  H03D7/1475

Abstract: A sub-harmonic mixer circuit having an input stage (52) and a current modulating stage (64 is disclosed. The input stage (52) receives an RF input signal (RF+, RF−) at a first frequency and generates output currents (il , i2) varying in dependence upon the Rf input signal. The current modulating stage (64) comprises a first transistor (Q3) for receiving a first local oscillator signal (LO0) respective and a second transistor (Q4) for receiving a second local oscillator signal (LO180), 180 degrees out of phase with the first local oscillator signal, such that a modulating current signal (iO), having twice the local oscillator frequency is superimposed onto the output currents.

Abstract translation: 具有输入级（52）和电流调制级（64）的亚谐波混频电路，输入级（52）以第一频率接收RF输入信号（RF +，RF-），并产生输出电流 电流调制级（64）包括用于接收第一本地振荡器信号（LO0）的第一晶体管（Q3）和用于接收第二本地振荡器的第二晶体管（Q4） 信号（LO180）与第一本机振荡器信号相差180度，使得具有两倍本地振荡器频率的调制电流信号（iO）叠加到输出电流上。

公开(公告)号：US20120176259A1

公开(公告)日：2012-07-12

申请号：US13004883

申请日：2011-01-12

Applicant: Mihai A. T. Sanduleanu ,  Jean-Oliver Plouchart

Inventor： Mihai A. T. Sanduleanu ,  Jean-Oliver Plouchart

IPC: H03M1/06

CPC classification number: H03M1/1061 ,  H03M1/365

Abstract: A flash analog to digital converter and a method and system for dynamically calibrating the flash analog to digital converter. The analog to digital converter may include a track and hold circuit and a plurality of comparators. The analog to digital converter may also include an under-sampling circuit configured to convert a digitized reference signal into an under-sampled digitized reference signal with a frequency of the calibration frequency divided by a positive number M. The under-sampling circuit may be further configured to calibrate a subsequent signal based on the under-sampled digitized reference signal.

Abstract translation: 闪存模数转换器和用于动态校准闪存模数转换器的方法和系统。 模数转换器可以包括轨道和保持电路以及多个比较器。 模数转换器还可以包括欠采样电路，其被配置为将校准频率的频率除以正数M将数字化参考信号转换为欠采样的数字化参考信号。欠采样电路可以进一步 被配置为基于欠采样的数字化参考信号校准后续信号。

公开(公告)号：US20090295454A1

公开(公告)日：2009-12-03

申请号：US11720318

申请日：2005-11-24

Applicant: Mihai A. T. Sanduleanu ,  Eduard F. Stikvoort

Inventor： Mihai A. T. Sanduleanu ,  Eduard F. Stikvoort

IPC: G06F7/44

CPC classification number: H03F3/45085 ,  H03D7/1433 ,  H03D7/1441 ,  H03D7/1458 ,  H03D7/1491 ,  H03F2200/294 ,  H03F2200/372 ,  H03F2200/513 ,  H03F2203/45374 ,  H03F2203/45644

Abstract: A mixer circuit (102) for use in radio frequency (RF) equipment is disclosed. The mixer comprises a current source (Io) and a differential amplifier (Q1, Q2) connected to the current source and having input terminals (RF+, RF−) for receiving an RF input signal and output terminals (IF+, IF−) for providing an intermediate frequency signal. A local oscillator signal (LO) is applied to a transistor (Q3) connected in parallel with the differential amplifier to adjust the current flowing in the differential amplifier such that the differential output signal contains components having frequencies at the sum and difference frequencies of the RF and local oscillator signals. Emitter degeneration resistors (R1) and a transistor Q4 for diverting part of the current to the supply improve the linearity of the mixer.

Abstract translation: 公开了一种用于射频（RF）设备的混频器电路（102）。 混频器包括连接到电流源的电流源（Io）和差分放大器（Q1，Q2），并且具有用于接收RF输入信号的输入端（RF +，RF-）和用于提供的RF输入信号的输出端（IF +，IF-） 中频信号。 将本地振荡器信号（LO）施加到与差分放大器并联连接的晶体管（Q3），以调节在差分放大器中流动的电流，使得差分输出信号包含频率为RF和 和本地振荡器信号。 发射极退化电阻（R1）和用于将电流的一部分转向电源的晶体管Q4改善了混频器的线性。