Sökning: "microwave noise"

Visar resultat 1 - 5 av 96 avhandlingar innehållade orden microwave noise.

1. 1. Low phase noise voltage controlled micro- and millimeter wave oscillators

   Författare :Stefan Andersson; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; radio; anti series; microstrip resonator; silicon bipolar transistor; amplitude limiter; cavity resonator; varactor; transposed gain; MESFET; automatic gain control; VCO; delay line; laser; RF; oscillation criteria; millimetre wave; oscillator; mm-wave; noise; multiplier; fibre optic; SAW; DRO; PLL; surface acoustic wave; Si BJT; 1 f noise; FM noise; HEMT; clipping diode; HBT; YIG sphere; device; terfenol; gunn diode; stabilised; YIG film; quarts crystal; phase locked loop; magnetostrictive; resonator; phase error; whispering gallery mode; sapphire resonator; Fabry-Perot resonator; PHEMT; microwave; HFET; phase noise; DR; dielectric resonator; PM noise; balanced oscillator; piezo electric; AGC; frequency discriminator;

   Sammanfattning : .... LÄS MER

3. 2. Cryogenic low noise amplifiers for microwave frequencies

   Författare :Jianguo Xu; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; MODFET; cryogenic; millimeter-wave; low-noise amplifier; FET noise model; microwave; TEGFET; HEMT; noise measurement; HFET; computer-aided design;

   Sammanfattning : .... LÄS MER

4. 3. Experimentally Based HFET Modeling for Microwave and Millimeter Wave Applications

   Författare :Mikael Garcia; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; MODFET; soft-breakdown; cold FET; large-signal; source balance; SDHT; dispersion; noise figure; temperature noise model; small-signal; TEGFET; direct extraction; Chalmers model; noise parameters; modeling; HEMT; HFET; noise;

   Sammanfattning : Transistor models are very important in the design of Monolithic Microwave Integrated Circuits (MMICs). Circuit simulations based on accurate transistor models are one of the keys to high circuit yield. Transistor models can also be used to trace problems in the device fabrication processes. LÄS MER

5. 4. Microwave Transistor Noise Model Extraction Methods and a Non-Contacting Scattering Parameter Measurement Method

   Författare :Jörgen Stenarson; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; extraction; S-parameter; noise parameter; vector network analyzer; electro-magnetic probe; microwave; non-contacting testing; transistor noise model; VNA; EM-probe; non-invasive testing;

   Sammanfattning : This thesis has two parts. The first part discuss noise model extraction methods for FETs. The second part describe theory and implementation of a non-contacting S-parameter measurement method. Noise is an important aspect for a circuit designer, because noise generated in the circuit is a sensitivity limiting factor. LÄS MER

7. 5. Microwave characterisation of electrodes and field effect transistors based on graphene

   Författare :MICHAEL ANDERSSON; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Graphene; graphene electrodes; microwave amplifiers; noise measurements; microwave FETs; CVD graphene; noise modelling; FBARs.; nanofabrication; subharmonic resistive mixers; small-signal FET modelling;

   Sammanfattning : The isolation of the two-dimensional material graphene, a single hexagonal sheet of carbon atoms, is believed to trigger a revolution in electronics. Theory predicts unprecedented carrier velocities in ideal graphene, from which ultrahigh speed graphene field effect transistors (GFETs) are envisioned. LÄS MER