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In the paper, a high linearity quadrature demodulator based on SiGe BiCMOS process is designed and implemented for 400MHz to 2GHz wide band wireless system. The 3rd intermodulation cancellation technique is applied to improve linearity. A negative feedback structure is applied to quadrature Gilbert mixer to lower its input impedance. RC polyphase network is analyzed and designed to increase the quadrature...
In this paper, a broadband up convert image-reject mixer integrated the quadrature signal generator is presented. The RC polyphase network (PPN) is used to convert the single-end LO input signal to differential and quadrature signals. A pair of inductors are added to the traditional PPN to enhance the image rejection ratio (IRR). A linearity enhanced tranconductance cell is applied to the quadrature...
In this paper, a broadband upconversion image-reject mixer integrating a quadrature signal generator is presented. The polyphase networks (PPNs ) are used to convert the single-ended local-oscillator input signal to quadrature signals. A pair of inductors is added to traditional PPN to enhance the return loss performance, while optimizing the image-reject ratio. A common-emitter tranconductance using...
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