Design of Microwave Active Devices by Jean-Luc Gautier

By Jean-Luc Gautier

This e-book offers tools for the layout of the most microwave energetic devices.

The first bankruptcy makes a speciality of amplifiers operating within the linear mode. The authors current the issues surrounding narrowband and wideband impedance matching, balance, polarization and the noise issue, in addition to particular topologies comparable to the allotted amplifier and the differential amplifier.

Chapter 2 matters the facility amplifier operation. particular elements on potency, impedance matching and sophistication of operation are offered, in addition to the most equipment of linearization and potency improvement.

Frequency transposition is the topic of bankruptcy three. the writer provides the working precept in addition to the various topologies utilizing transistors and diodes.

Chapter four is devoted to the operation of fastened frequency and tunable oscillators similar to the voltage managed oscillator (VCO) and the yttrium iron garnet (YIG).

The ultimate bankruptcy provides the most keep watch over capabilities, i.e. attenuators, part shifters and switches.

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1. Common-source configuration The admittance parameters that include noise values for common-source configuration are: ⎛Y (YS ) = ⎜ YS11 ⎝ S 21 YS 12 ⎞ ⎛ I NG ⎞ ⎟. ⎟ . 29] * * CYS 12 ⎞ ⎛ < I NG I NG > < I NG I ND >⎞ ⎟. 42. 43. 43. 2. 44. 35] Note that the output impedance is very high (low C gd ) and the real part of the input admittance is close to gm0 ; so it is adjustable by choosing the grid width of the transistor (grid development). 3. 45. 45. 39] We note that the input impedance is very high (low C gd ) and the real part of the output admittance is close to g m 0 ; so it is adjustable by choosing the transistor grid width (grid development).

Circuit B uses the self-polarization technique, which only uses one DC power supply. Grid polarization is obtained by making the grid potential equal to zero by means of a high value resistor RG and making the source potential a positive value due to a voltage drop across the resistors in series on the grid R S . This resistor is decoupled in dynamic mode with a capacitor C S for which the value is chosen so as not to degrade the gain too much. 2). – Circuit C uses an active load, which is a transistor polarized to VGS = 0 .

5. Balanced low-noise amplifier Some transistors have a very large difference between Γm1 and Γopt . In this case, the search for an acceptable compromise can be difficult or impossible. 40). The amplifiers are designed to obtain the minimum noise factor. 40. Balanced amplifier The distribution matrix of an ideal coupler is written as follows: ⎛0 0 1 j⎞ ⎜ ⎟ 1 ⎜0 0 j 1⎟ S= ⎜ ⎟ 2 ⎜1 j 0 0⎟ ⎜ j 1 0 0⎟ ⎝ ⎠ The operation of directional couplers is detailed in [PAS 05]. The performance analysis of this circuit can be done using the flow graphs method.

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