公开(公告)号：AU2002306770A1

公开(公告)日：2002-10-03

申请号：AU2002306770

申请日：2002-03-18

Applicant: CONEXANT SYSTEMS INC

Inventor： HATCHER GEOFFREY ,  MAGOON RAHUL ,  MOLNAR ALYOSHA C

IPC: H03D7/14 ,  H04B1/28 ,  H04B1/26

Abstract: Double balanced mixers having transistor pairs are affected by area mismatches between the transistors. The area mismatches can be represented as a ratio between the mixer core transistors that is directly related to voltage. Thus, an input voltage into one of the mixer core transistors in a transistor pair can compensate for the area mismatch. The compensation is achieved by a voltage track and hold feedback loop to one of the mixer core transistors.

公开(公告)号：WO0227954A8

公开(公告)日：2002-08-01

申请号：PCT/US0128263

申请日：2001-09-10

Applicant: CONEXANT SYSTEMS INC

Inventor： MOLNAR ALYOSHA C ,  MAGOON RAHUL

IPC: H03D7/14 ,  H04B1/26 ,  H04B1/28 ,  H04B1/30 ,  H04L27/22 ,  H04L27/38

CPC classification number: H04B1/30 ,  H03D7/1408 ,  H03D7/1433 ,  H03D7/1458 ,  H03D7/1475 ,  H03D2200/0047 ,  H03D2200/0088 ,  H04B1/28

Abstract: A subharmonic mixer (510) has two switching stages is used to improved mixer gain in a direct downconversion receiver (500). The first switching stage mixes a received RF signal (520) to an intermediate frequency that is one-half of the RF signal frequency. The second switching stage mixes the intermediate signal to baseband. By connecting the two switching stages in series, current is reused and harmonic content from the first stage is fed into the second stage thereby improving the mixer gain.

Abstract translation: 具有两个开关级的分谐波混频器（510）用于改善直接下变频接收机（500）中的混频器增益。 第一切换级将接收到的RF信号（520）混合到是RF信号频率的一半的中间频率。 第二个开关级将中间信号混合到基带。 通过串联连接两个开关级，电流被重复使用，第一级谐波含量被馈入第二级，从而提高了混频器的增益。

公开(公告)号：WO02075991A3

公开(公告)日：2003-03-20

申请号：PCT/US0208486

申请日：2002-03-18

Applicant: CONEXANT SYSTEMS INC

Inventor： HATCHER GEOFFREY ,  MOLNAR ALYOSHA C ,  MAGOON RAHUL

IPC: H03D7/14 ,  H04B1/28 ,  H04B1/26

CPC classification number: H03D7/1425 ,  H03D7/145 ,  H03D7/1458 ,  H03D2200/0043 ,  H03D2200/0047 ,  H03D2200/0088 ,  H04B1/28

Abstract: Double balanced mixers (100) having transistor pairs (112,114,122,124) are affected by area mismatches between the transistors. The area mismatches can be represented as a ratio between the mixer core transistors that is directly related to voltage. Thus, an input voltage (102) into one of the mixer core transistors in a transistor pair can compensate for the area mismatch. The compensation is achieved by a voltage track and hold feedback loop created by operational amplifier (162), to one of the mixer core transistors.

Abstract translation: 具有晶体管对（112,114,122,124）的双平衡混频器（100）受到晶体管之间的区域不匹配的影响。 区域不匹配可以表示为与电压直接相关的混频器核心晶体管之间的比率。 因此，晶体管对中的混频器核心晶体管之一的输入电压（102）可以补偿区域失配。 通过由运算放大器（162）产生的电压跟踪和保持反馈回路来实现补偿到混频器核心晶体管之一。

公开(公告)号：WO02080351A8

公开(公告)日：2003-01-09

申请号：PCT/US0209243

申请日：2002-03-25

Applicant: CONEXANT SYSTEMS INC

Inventor： DAMGAARD MORTEN ,  DOMINO WILLIAM J ,  MAGOON RAHUL ,  MOLNAR ALYOSHA C ,  ZACHAN JEFF

IPC: H03B1/00 ,  H03L5/00 ,  H03L7/087 ,  H03L7/099 ,  H03L7/113 ,  H03L7/187 ,  H04B1/40 ,  H03D3/24 ,  H03L7/00 ,  H03L7/06 ,  H04B1/06 ,  H04B1/18 ,  H04B1/26 ,  H04L25/49 ,  H04L27/06

CPC classification number: H03L7/099 ,  H03B2201/025 ,  H03B2201/0291 ,  H03J2200/10 ,  H03L5/00 ,  H03L7/087 ,  H03L7/113

Abstract: Systems for controlling the frequency of the output signal of a controllable oscillator (202) in a frequency synthesizer (200) are provided. One such system comprises a controllable oscillator (202) and a frequency control circuit (208). The controllable oscillator (202) is configured to generate an output signal that has a predefined frequency. The controllable oscillator (202) is also configured with a plurality of operational states that are controlled by the frequency control circuit (208). Each operational state of the controllable oscillator (202) defines a distinct frequency for the output signal of the controllable oscillator (202). The frequency control circuit (208) receives the output signal of the controllable oscillator (202) and determines the distinct frequency for the output signal that best approximates the predefined frequency. The frequency control circuit (208) may also provide a control signal to the controllable oscillator (202) that is configured to change the controllable oscillator (202) to the operational state corresponding to the distinct frequency that best approximates the predefined frequency.

Abstract translation: 提供了用于控制频率合成器（200）中的可控振荡器（202）的输出信号的频率的系统。 一个这样的系统包括可控振荡器（202）和频率控制电路（208）。 可控振荡器（202）被配置为产生具有预定频率的输出信号。 可控振荡器（202）还配置有由频率控制电路（208）控制的多个操作状态。 可控振荡器（202）的每个操作状态为可控振荡器（202）的输出信号定义不同的频率。 频率控制电路（208）接收可控振荡器（202）的输出信号，并确定最接近于预定频率的输出信号的不同频率。 频率控制电路（208）还可以向可控振荡器（202）提供控制信号，该控制信号被配置为将可控振荡器（202）改变到对应于最接近于预定频率的不同频率的操作状态。

公开(公告)号：EP1329028A4

公开(公告)日：2004-10-13

申请号：EP01970746

申请日：2001-09-10

Applicant: CONEXANT SYSTEMS INC

Inventor： MOLNAR ALYOSHA C ,  MAGOON RAHUL

IPC: H03D7/14 ,  H04B1/26 ,  H04B1/28 ,  H04B1/30 ,  H04L27/22 ,  H04L27/38

CPC classification number: H04B1/30 ,  H03D7/1408 ,  H03D7/1433 ,  H03D7/1458 ,  H03D7/1475 ,  H03D2200/0047 ,  H03D2200/0088 ,  H04B1/28

Abstract: A subharmonic mixer (510) has two switching stages is used to improved mixer gain in a direct downconversion receiver (500). The first switching stage mixes a received RF signal (520) to an intermediate frequency that is one-half of the RF signal frequency. The second switching stage mixes the intermediate signal to baseband. By connecting the two switching stages in series, current is reused and harmonic content from the first stage is fed into the second stage thereby improving the mixer gain.

公开(公告)号：EP1320928A4

公开(公告)日：2004-03-03

申请号：EP01971404

申请日：2001-09-07

Applicant: CONEXANT SYSTEMS INC

Inventor： MOLNAR ALYOSHA C ,  MAGOON RAHUL

IPC: H03G7/08 ,  H03H11/04 ,  H03K5/00

CPC classification number: H03G7/08 ,  H03H11/0461

Abstract: A G>m m m m