Design of FET frequency multipliers and harmonic oscillators by Edmar Camargo

Design of FET frequency multipliers and harmonic oscillators by Edmar Camargo

By Edmar Camargo

Introducing the applying of box impression Transistors (FET) as frequency multipliers and harmonic oscillators, this article places emphasis on nonlinear concepts, and contains a minimum volume of arithmetic and a mix of thought and experimentation. It goals to aid microwave and millimeter-wave engineers understand the basic suggestions and layout principles of frequency multipliers and harmonic oscillators. The textual content specializes in the suggestions required to generate harmonics and emphasizes circuits. It explores the layout of slender and bandwidth doublers and triplers - either single-ended and balanced configuration. It additionally explains the organization among oscillator thought and frequency multiplier conception in designing harmonic turbines. the real concerns whilst utilising MIC or MMIC applied sciences are mentioned to aid designers decide upon the easiest procedure for a specific circuit.

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To mate, the threaded sleeve is extended on one connector and retracted on the other. On the retracted connector, the coupling nut is extended to engage the other’s sleeve and is tightened. Only one coupling nut should be tightened, although it is common but incorrect practice to also tighten the other coupling nut. In fact, tightening both coupling nuts can result in the center pins pulling apart, and a poorly matched contact. Occasionally, one sees parts that contain only a solid threaded outer conductor (serving the purpose of the threaded sleeve) and no coupling nut.

Similarly, IP5 is the fifth-order intercept point, and so on. It is also interesting to note that in general at high powers the IM tone powers may not increase but may decrease or have local minima. This is due to the effect of high-order IM products remixing, and creating significant signals that lie on the lower-order products and can increase or decrease their level, depending upon the phasing of the signals. There is often some confusion about third-order IM products (IM3) and third-order intercept point (IP3) and both are sometimes referred to as “third-order intermod”.

77) Inspection of Eq. 77) shows that the impedance of a cable must increase as the frequency goes down toward DC. 07 pF/mm (typical for RG 6 CATV coax). In this case, the impedance deviates from the expected value at 300 kHz by over 10 ohms, and by 1 ohm at 1 MHz. This low frequency response of impedance for any real transmission line is often unexpected by those unfamiliar with Eq. 77), and it is sometimes assumed that this is a result of measurement error. However, all real transmission lines must show such a low frequency characteristic, and verification methods must take into account this effect.

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