About
22
Publications
9,470
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
93
Citations
Introduction
Current institution
Publications
Publications (22)
The cascade analysis is used to assess the performance of a receiver stage block diagram. While the formulation is quite useful and is easy to apply, it is subject to a number of limitations, simplified assumptions and subsequently incorrect results. The main performance element treated in this paper is sensitivity. The cascade formulation assumes...
The balun is investigated as an extension of the ideal transformer. The application of scattering parameter measurements highlights several basic circuit attributes. Simplified circuits show that the transformer voltage balun and the current balun are nearly identical except for one tiny subtlety. The S parameters assist in showing the differences...
The details of magnetic coupled RF transformer circuits
Application and verification of spice models and FFT techniques to a systematic design flow for class C RF power amplifiers in the 1-10 W class. A bipolar device is explored as used in a small transmitter. The approach includes finding the required impedance transforming circuits, power gain and efficiency. The technique uses freely available softw...
A power amplifier (PA) design requires a number of design tools to improve its performance. Temperature contours are utilized to help in PA termination impedance selection. The use of a combined relationship between these parameters that provide an additional concise design objective via the dissipated power contours is explored to address this cha...
An analytic technique and figure-of-merit (Fnm) for the trade-off of noise measure and mismatch loss in the design of a low noise amplifier is presented. The trade-off between various design parameters as a function of inductive source degeneration is evaluated from design curves developed and are shown to be unique to the selected device. Several...
A voltage-controlled oscillator (VCO) was designed for operation in C-band for use in a microwave point-to-point radio system. Microstrip technology was chosen for resonator implementation since it offers ease of manufacturing and frequency adjustment. The design was performed using an electromagnetic harmonic balance co-design technique in conjunc...
A voltage controlled oscillator (VCO) was designed for operation in C-band for use in a microwave point-to-point radio system. Microstrip technology was chosen for resonator implementation since it offers ease of manufacturing and frequency adjustment The design was performed using an electromagnetic (EM)-harmonic balance co-design technique in ord...
Negative resistance voltage-controlled oscillators (VCOs) are systematically designed to operate with loaded resonator networks that permit stable steady-state oscillation over a specified tuning bandwidth. Circuit parasitics, however, significantly affect tuning behavior and complicate straightforward design. This paper introduces a scheme that co...
Transient simulation of narrowband bandpass filters used in microwave circuits is challenging because of matrix ill-conditioning. Here, such filters are modelled as the equivalent discrete-time form developed using a bilinear z-transform. The technique has been implemented in a general purpose transient circuit simulator and validated using a 1.7 G...
Barium strontium titanate (BST) varactors utilized in a VCO demonstrate unique tuning characteristics compared to junction varactors. A 2.7 GHz microstrip line VCO operates in a tracking phaselock loop configured as an X4 frequency multiplier. BST oscillator tuning and the effect on loop dynamics is observed by the intentional design of an under da...
A 1.6 GHz power oscillator with a GaN-on-Si heterostructure field effect transistor (HFET) is reported. The voltage-controlled oscillator used a thin-film barium strontium titanate (BST) interdigital varactor as the tuning element. The surface-mount varactor was fabricated using sputtered BST film and copper metallization on alumina. An output powe...
This paper presents a time-domain simulation of phase noise in a varactor-tuned voltage-controlled oscillator. Flicker, thermal and shot noise are captured using transient sources of noise based on the principles of mathematical chaos. High levels of noise are handled by replacing the ordinary differential equations used in conventional transient c...
An approach to the design of cascade receiver and transmitter systems for maximum spurious-free dynamic range (SFDR) is introduced. The contribution method developed here provides a good initial assignment of noise figure, gain, and linearity requirement to individual stages and enables informed assessment of trade-offs during system design. Applic...
The phase noise of an oscillator with a thin-film barium strontium titanate (BST) capacitive tuning element, or varactor, is characterised and benchmarked against the same oscillator with a silicon semiconductor junction varactor. Phase noise tracks closely with varactor Q within a specific voltage range as expected. Compared to the semiconductor v...
The ultimate limitation to characterizing noise in microwave amplifiers derives from the noise inserted by the front-end of the measurement set. Typically a high-gain low noise preamplifier is used in the measurement set to improve accuracy. Even then there is a limit to the minimum noise factor that can be measured. In this paper an extended Y-fac...
Barium strontium titanate (BST) has a field-dependent permittivity and can be used as a dielectric in voltage tunable capacitors or varactors. These BST-based varactors are passive devices and have significantly different properties compared to semiconductor varactors. A voltage tunable oscillator using a BST thin film varactor was designed and cha...
The graphic analysis used in RF circuit
design has historically benefitted from
the invention of the Smith® Chart [1, 2].
Now, with the advent of math packages such as
Matlab®, Mathematica®, Mathcad® and others,
further enhancements are possible. This article
reviews classic design examples.
A n analytic tech-nique and figure-of-merit (F nm) for the trade-off of noise measure and mismatch loss in the design of low noise amplifier is pre-sented. The trade-off between various design parameters as a function of inductive source degeneration is evaluated using the developed design curve. It is shown that the design curves are unique to the...
