Patent ID: 7236212
Filing Date: 2007-06-26
Classification: H01F,H01L,H03B,H03D,H03F,H03G,H03H,H03J,H03L

Abstract:
1. A receiver, comprising: a substrate; a first mixer that performs up-conversion and is disposed on the substrate; a differential filter coupled to an output of the first mixer; a second mixer that performs down-conversion and provides image rejection, disposed on the substrate and coupled to an output of the differential filter, wherein the second mixer. is a differential I/Q mixer; a first polyphase circuit disposed on the substrate that provides I and Q local oscillator signals for mixing in the second mixer; and a second polyphase circuit disposed on the substrate that combines I and Q output signals of the second mixer to complete the image rejection; wherein the differential filter is external to the substrate and has a passband that is determined to pass an up-converted output of the first mixer.