A High Gain Low Noise Mixer With Cross-Coupled Bleeding

Yoon, Duk Yong; Yun, Sungryul; Cartwright, Justin; Han, Sehee; Lee, Sang‐Gug

doi:10.1109/lmwc.2011.2166251

Cited by 11 publications

(1 citation statement)

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“…Following them are several improved mixer topologies with enhanced performance. Of them, the static current injection has been proposed in [8,9] to reduce the noise current pulses appearing at the output, by injecting a constant bias current. Then the dynamic current injection has been proposed in [10] by embedding a controlled injection circuit to inject current pulses functioning only at the switching instances, which also can compensate noise current pulses of switch pairs.…”

Section: Introductionmentioning

confidence: 99%

Low-Frequency Noise in CMOS Switched-gm Mixers: A Quasi-Analytical Model

et al. 2020

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Flicker noise contributed by active mixers usually compromises the overall sensitivity level of direct-conversion receivers (DCRs). In this paper, a qualitative quasi-analytical model has been developed to in-depth explain the flicker noise mechanism existing in the switched-gm active mixer in which an improved current source switch is presented for high mixer common-mode rejection ratio (MCMRR). The built model simply explains how frequency translations take place within the mixer. Compact equations are derived to estimate the flicker noise contribution of individual stages at the output. Simulations validate the accuracy of the predictions, and the dependence of flicker noise on local oscillator (LO) slope ratio, period, and other circuit parameters. The high-frequency limitation of the mixer is further estimated by investigating into the tail parasitic capacitance charging and discharging behavior. Furthermore, a switched-gm pMOS mixer prototype with low flicker noise is implemented in a 0.18-μm CMOS process. It operates at an RF input frequency of 1 GHz and provides a maximal conversion gain of 12.9 dB and an NF of 11.4 dB while a flicker noise corner of 220 kHz and an IIP3 of 3.6 dBm are measured, respectively. The mixer core only consumes 3.3 mW from a 1.8 V supply. INDEX TERMS switched transconductor mixers, noise figure (NF), flicker noise, noise transfer function modelling, pMOS, mismatch, mixer common-mode rejection ratio (MCMRR).

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Section: Introductionmentioning

confidence: 99%