Gazourian, Martin G.

The design of high order switched-capacitor highpass filters is
presented. Emphasis is placed on the design procedures of cascaded
biquadratic sections and ladder network realizations of switchedcapacitor
highpass filters. The stability problem of the doubly terminated
switched-capacitor ladder highpass filter is discussed. Design
examples are presented to illustrate the design procedures. The
sensitivities of the realization methods are discussed. An .analytical
equation of the gain deviation for the cascaded biquadratic sections
realization is derived. Monte Carlo analysis is performed for the
design examples. The results of the analyses are compared to reveal
the differences in sensitivities in terms of the order of the filters
and the type of realizations.

A design theory for high frequency oscillators is presented. Emphasis is placed on oscillator design techniques which are applicable to the electrical tuning of LC and transmission line resonators. Attention is paid to design approaches which yield an oscillator with high spectral purity and a large signal to noise ratio. Theory and measurements demonstrate for the oscillator configurations investigated the a small L/C ratio is desirable for improved oscillator signal to noise ratio. Equations are developed which define the noise figure the oscillator due to the additive noise of the active device. This analysis demonstrates the need for a high device starting transconductance which should be subsequently reduced during oscillation to minimize the device noise contribution. A relationship is developed between the receiver dynamic range and the oscillator signal to the noise ratio. Oscillator designs in the region 20 Mhz - 200 Mhz verify the analysis. A unified approach to large signal oscillator design is investigated and relationships to oscillator signal to noise ratio using the previously developed theory are noted

Portable UHF transceivers typically require minimal current
drain frequency converters to multiply the frequencies generated
by crystal controlled oscillators up to the UHF band. The step
recovery diode (SRD) provides an approach to frequency multiplication
that requires no d.c. bias and hence minimizes battery drain.
This thesis compares the SRD to the more conventional varactor
and analyzes SRD device physics and characteristics. SRD operation
is explained in terms of the conduction and depletion intervals.
The rapid transition from the conduction to the depletion
mode allows the SRD to generate high order harmonics of the input
frequency. A step-by-step design procedure for a series mode
frequency multiplier is presented and empirical observations are
used to help explain multiplier operation. The jump phenomena
and hysteresis effects previously unexplained in relation to SRD
multipliers are explored. Finally, it is shown that the SRD can
function as a parametric amplifier.