Widely Tunable Optical Local Oscillator Scheme for RF Photonic Down-Conversion

A radio frequency (RF) low voltage and low power down conversion mixer with high linearity using TSMC 0.18-μm technology is presented which operates in 2.4 GHz Industrial Scientific and Medical (ISM) band. The local oscillator (LO) frequency is 2.1 GHz with an input power of 5 dBm, whereas IF frequency is 300 MHz. Multiple gated transistors (MGTRs) method is used to increase the linearity of Gilbert cell mixer. In this method an auxiliary transistor is used parallel to the transconductance stage transistor. This increases linearity by decreasing of transconductance stage transistor. The simulation results show an IIP3 improvement of 16.55 dBm. The proposed low power and highly linear mixer consumes a power of 4.46 mW from 1.8 V a supply voltage. The noise figure (NF) and gain conversion are about 13.8 dB and 9.11 dB, respectively.

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A Wideband Subharmonic Mixer Incorporating Signal Interference Technique Based Isolation Circuit

International Journal of Engineering and Advanced Technology - Regular Issue ◽

10.35940/ijeat.b3072.129219 ◽

2019 ◽

Vol 9 (2) ◽

pp. 132-136

Keyword(s):

Intermediate Frequency ◽

Local Oscillator ◽

Signal Interference ◽

Frequency Range ◽

Conversion Loss ◽

Large Signal ◽

Third Order ◽

Single Sideband ◽

Down Conversion ◽

Intercept Point

A broadband (8.7 GHz – 11.5 GHz) performing passive sub-harmonic down-conversion mixer using signal interference technique (SIT) is demonstrated, designed and reported in this paper. The local oscillator (LO) frequency is half of the radio frequency (RF) for the 2xsub-harmonic mixer architecture; therefore, for the RF lying in the range 8.7 GHz to 11.5 GHz, required LO frequency range is 4.25 GHz to 5.65 GHz with 0.2 GHz fixed intermediate frequency (IF). With a broadband operation, designed prototype shows single sideband down-conversion loss in the range 9.6 dB – 12.6 dB. Moreover, large-signal testing infers an adequate linear trait of the proposed design, showing -3 dBm and 11.32 dBm for the 1 dB compression point and third order input intercept point, respectively.

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A chip-scale frequency down-conversion realized by MEMS-based filter and local oscillator

Sensors and Actuators A Physical ◽

10.1016/j.sna.2019.111787 ◽

2020 ◽

Vol 302 ◽

pp. 111787

Author(s):

Jyoti Satija ◽

Sukomal Dey ◽

Shashwat Bhattacharya ◽

Gayathri Pillai ◽

Sheng-Shian Li

Keyword(s):

Local Oscillator ◽

Down Conversion

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Multi-band multi-standard local oscillator generation for direct up/down conversion transceiver architectures supporting WiFi and WiMax bands in standard 45nm CMOS process

2010 IEEE Radio Frequency Integrated Circuits Symposium ◽

10.1109/rfic.2010.5477246 ◽

2010 ◽

Cited By ~ 6

Author(s):

Ram Sadhwani ◽

Assaf Ben Bassat ◽

Adil A. Kidwai ◽

Shahar Rivel

Keyword(s):

Local Oscillator ◽

Cmos Process ◽

Down Conversion ◽

Multi Band

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Wideband Microwave Frequency Down-Conversion with Optical Harmonics Intensifier and Low-Frequency Local Oscillator

CLEO Pacific Rim Conference ◽

10.1364/cleopr.2018.f2c.2 ◽

2018 ◽

Author(s):

Xinhai Zou ◽

Shangjian Zhang ◽

Heng Wang ◽

Mengke Wang ◽

Zhiyao Zhang ◽

...

Keyword(s):

Low Frequency ◽

Microwave Frequency ◽

Local Oscillator ◽

Down Conversion

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DDC Design for Multi-Frequency Receiver Based on RF Sampling

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.651-653.413 ◽

2014 ◽

Vol 651-653 ◽

pp. 413-416

Author(s):

Chun Yang Han ◽

Wei Sun ◽

Gui Xin Han

Keyword(s):

Sampling Rate ◽

Software Radio ◽

Sampling Technique ◽

High Sensitivity ◽

Local Oscillator ◽

High Signal ◽

High Sampling Rate ◽

Stable Performance ◽

Down Conversion ◽

Rf Sampling

Multi-frequency receivers rely on GNSS to achieve high-precision positioning, high sensitivity and other functions. GNSS signal frequencies are widely distributed around 1.1GHz to 1.6GHz. Good performance RF front-end receiver will provide high-quality acquisition and tracking environment, reducing the SER to ensure CNR. RF sampling technique is widely used in software radio for its simple structure, flexible configuration, and other advantages, but rarely used in satellite navigation, because the high signal carrier frequency and sampling rate, down-conversion based on RF sampling becomes a big challenge. So, to solve the problems of widely distributed we design three signal bands, using different local oscillator to implement signal down-conversion; to solve the problems of high sampling rate, we propose a down-conversion program of using a cascade of CIC filter’s ployphase and FIR compensation filter. Through the simulation of MATLAB after tracking tests, analysis of CNR and other indicators of programs. Ultimately, we implement the program with Verilog language on the multi-frequency GNSS receiver. The results show that this scheme can achieve digital down-conversion and stable performance of tracking loop with less consumption of resources.

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