2022-09-26 15:09 Status: #reference # Practical MMIC Design Steve Marsh ## Chapter 1: Introduction ## Chapter 2: Component Technology and Foundry Choice ## Chapter 3: Foundry Use and Economics ## Chapter 4: Simulation and Component Models ## Chapter 5: Design Primarily conducted in the frequency domain. Design is: one or more signals must be coupled onto the chip efficiently, functions performed then coupled out of the chip and into the system. Requires impedance of source matches that of the chip. All about impedance! Max power transfer needs matched impedances. Separating RF signals from DC bias requires impedance changes vs. frequency. ### 5.1 Impedance Matching and the Smith Chart #### 5.1.1 Matching Complex conjugate for max power transfer (net phase difference equals zero). Two different impedances, $Z_{optimum}$ and $Z_{gain}$.  #### 5.1.2 Smith Chart Allows the plotting of all possible reflection coefficients, impedances and admittances of a passive network. Reflection Coefficient: $\Gamma=\frac{Z_L-Z_0}{Z_L+Z_0}$   #### 5.1.3 Converting Impedance to Reflection Coefficient Plot the normalised impedance, then find magnitude and angle of the impedance to find reflection coefficient.  #### 5.1.4 Converting Impedance to Admittance Impedance to admittance is first normalised (/Z0) and plotted. Then slip about y-axis to get YN.  #### Deriving the Conjugate Impedance Exact same as above but flip about x-axis.   #### 5.1.6 Transforming a Load Impedance Along a Lossless Transmission Line  "wavelengths toward generator" is 0 at LHS (S/C) increases to 0.25 at RHS (O/C). It then continues to a value of 0.5 at the start. Thus a quarter-wavelength's length of transmission line turns a short to an open and vice-versa - used to transform the value of the real part of impedances. A half-wavelength takes you to the same place. ### 5.6 Switches  Low "on" loss and high "off" isolation ### 5.7 Phase Shifters #### 5.7.1 Reflective Phase Shifters 90 degree hybrid coupler ([Lange coupler](Lange.md)) ### 5.7.2 Loaded-Liine Phase Shifters  Reactive load at each end. >"The varactor diodes at either end of the transmission line can be replaced with a switch connected to different lumped reactances in order to make a digitally controlled phase shifter" #### 5.7.4 Switched Filter Phase Shifter  ### 5.10 Millimeter-Wave Circuits free-space wavelength is <1cm (better expressed in mm). 30-300GHz, but due to higher dielectric constant GaAs microstrip can have a wavelength as short as 3mm. ## Chapter 6: Layout ## Chapter 7: Processing Technology ## Chapter 8: Test --- # Source [eBook - Marsh, S. - Practical MMIC Design](../../Spaces/Career/Companies/Millibeam/docs/references/Textbooks/eBook%20-%20Marsh,%20S.%20-%20Practical%20MMIC%20Design.pdf)