Direct conversion receiver

专利名称：Direct conversion receiver

发明人：Dmitriy Rozenblit,William J. Domino,Morten

Damgaard,Mark Oskowsky

申请号：US09260919申请日：19990302公开号：US06360087B1公开日：20020319

专利附图：

摘要：A direct conversion receiver system is provided in which a first input signal at afirst frequency is applied to a first input port of a multiplier, a second input signal at asecond frequency equal to about {fraction (1/n)} times the first frequency, wherein n is an

integer, is applied to a second input port of the multiplier. A first filter coupled to thefirst input port is configured to substantially filter out any leakage at the secondfrequency which may be present. A second filter coupled to the second input port isconfigured to substantially filter out any leakage at the first frequency which may bepresent. The multiplier is configured to produce a signal at an output port thereof whichis derived from the product of the first and second signals. In one embodiment, theoutput is representative of the product of the filtered first signal and a multiplicationfactor which switches at n times the second frequency. The output of the multiplier iscoupled to a third filter. The output signal has a baseband component and anothercomponent. The third filter is configured to substantially filter out the other componentand substantially maintain the baseband component in the output signal. In one

implementation example, the multiplier is a mixer initializing half-frequency injection, suchthat the LO frequency is about the RF frequency.

申请人：CONEXANT SYSTEMS, INC

代理机构：Howrey Simon Arnold & White

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