In this paper various mixers are defined for CDMA applications . Using CMOS makes easier for mixers to act on same chip with other digital and analog circuits . The topologies we are defining are dual gate mixers , back gate mixers, single balanced current switching mixers and back end mixers . The backgate mixer utilizes the inherent lateral bipolar transistor in CMOS. Device simulations were ...

this paper presents a design of an uwb downconversion integrated cmos resistive ring mixer with linear voltage regulator (lvr), to supply required biasing voltages for the mixer section. the designed mixer circuit has been optimized for using in heart rate extraction system with microwave doppler radar at 2.4ghz frequency. this mixer needs 2 dc bias voltages equal to 0.5 and 1 volts for its bes...

In this paper, the research advances in silicon based millimeter wave and THz ICs in the State Key Laboratory of Millimeter Waves is reviewed, which consists of millimeter wave amplifiers, mixers, oscillators at Q, V and W and D band based on CMOS technology, and several research approaches of THz passive ICs including cavity and filter structures using SIW-like (Substrate Integrated Waveguide-...

In the current state of art, WiFi-alike standards require achieving a high Image Rejection Ratio (IRR) while having low power consumption. Thus, quadrature structures based on passive ring mixers offer an attractive and widely used solution, as they can achieve IRR being block. However, it is not easy for designer to know when simple scheme enough should aim double structure approach, latter im...

This paper introduces a CMOS-microfluidics integration scheme for electrochemical microsystems. A CMOS chip was embedded into a micro-machined silicon carrier. By leveling the CMOS chip and carrier surface to within 100 nm, an expanded obstacle-free surface suitable for photolithography was achieved. Thin film metal planar interconnects were microfabricated to bridge CMOS pads to the perimeter ...

Recently deep submicron and SiGe (silicongermanium) bipolar CMOS technologies have enhanced the performance of Si-based radio frequency (RF) integrated circuits up to microwave frequencies. The integration of RF MEMS components, such as inductors and capacitors, could further improve the performance of key RF circuit blocks such as voltage controlled oscillators (VCO), low-noise amplifiers, fil...

Image rejection ratio in CMOS double balanced mixers is strongly dependent on the balance between its branches. The influence of the mismatches is analyzed theoretically at the system and circuit level. Guidelines that show the maximum acceptable mismatch to meet a given image rejection ratio specification and experimental results are presented.