A computer assisted design of a microwave balanced mixer is presented /1/. It will be demonstrated that even in the presence of a dominant nonlinearity such as one or more mixer diodes a satisfying prediction of a rather complex circuit behaviour can be achieved. The theoretical results will be verified by experiments considering planar balanced mixers. 

MESFET microwave oscillators and dual gate mixers are analyzed by applying the harmonic balance method to the complete large signal device model combined with the external circuit. The combination results in a single port structure for the case of the oscillator and a three-port structure in the case of the mixer. Accurate prediction of the power efficiency and harmonic content of the oscillator a

A new theoretical approach to the design of n.port nonlinear microwave circuits is presented. Given a nonlinear element, its behavior is optimized independently of any embedding circuit. Linear circuit synthesis may then be performed by usual methods. The proposed method may be extended to n frequency component signal optimizations. Numerical examples are given. 

The capacitance and inductance matrices for a set of interconnecting lines are computed using the moment method. Capacitance matrix [C] is obtained by - inverting the potential matrix [P], whose terms are calculated from the multiple reflections theory to take into account the interface Air-GaAs. By an approximate formulation, we obtain simple analytical relations to calculate the coefficients of



On the base of a generalized signal flow approach to the interference measurement of two-port network parameters a new measuring set-up and its analysis for the measurement of four complex S-parameters are shown. The algorithm for the corresponding measurement procedure and data processing as well as the specific properties of the set-up and its components are dealt with. Advantages and disadvanta

A W-BAND NETWORK ANALYSER SYSTEM USING UP-CONVERSION ThomasHartmann ABSTRACT A complex S-parameter measurement system in the 94 GHz region essentially needs a sweep signal generator, e.g. in the range 91 GHz through 97 GHz. Several approaches are possible: an unstabilized IMPATT sweeper, which must generate sufficiently small noise to enable source locking in the network analyzer (Ref.l,2); a sy

The present work is devoted to the characterization and measurement of the phase instabilities produced by microwave amplifiers. We describe a special receiver designed for phase noise measurements at low Fourier frequencies. i.e. very close to the carrier in the spectral domain. Phase noise measurements of a microwave amplifier are presented and the noise floor of the receiver is shown and discus

We have demostrated the use of cryogenic variable-temperature loads for accurate noise measurements of low-noise cooled amplifiers and mixers in the microwave and millimeter wave range. The input noise temperature of the amplifier or mixer can be measured with an accuracy of t 1 K or better. 

A method for measuring losses of the tuner network used as noise source admittance transformer in transistor noise parameter test-set is presented. Since the method is based on noise figure measurements, tuner losses can be determined on-line while performing measurements for determining transistor noise parameters. As experimental verifications the optimum noise parameters of a GaAs FET in the