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Experiments with decoupling capacitors
Capacitors are placed into a test bed in parallel to a 25 Ohm system
impedance.
Transmission attenuation is an indication of the capacitors qualities as
a decoupler.
expermiments with
decoupling_capacitors (pdf, 6.8 MB)
The following two articles have appeared in DUBUS
magazine and in DUBUS Technik book VI, pages 139 to 179: "Low noise VHF
crystal oscillators"
Simulation of quartz crystals and oscillators with SuperCompact /
Serenade / ARRL Radio Designer.
The resonator itself, removal of parasitics, maximizing Q on the working
frequency, frequency pulling,
Text in German & English.
VHF Crystal
Oscillators part 1 (pdf, 320 KB)
Simulation of crystal oscillators with Ansoft
Serenade / Harmonica.
Sustaining amplifier, crystal dissipation, wild oscillations, 1/f noise,
1/f noise up conversion,
balancing noise close to the carrier vs. wideband noise,
negative impedance oscillators, Butler oscillator, things that can go
wrong.
Text in German & English. pdf needs some editing work. This is the
last WinWord version.
The printed version was done with PageMaker.
VHF Crystal
oscillators part 2 (pdf, 305 KB)
13 dBm 5 to 100 MHz reference frequency
distribution Amplifier (pdf, 1.6 MB)
A 220 pV/sqrt(Hz) low noise
preamplifier (pdf, 4 MB)
V2 zip file with updated
circuits, bom, gerbers (1.1 MB)
Noise
Measurements
On Chemical Batteries (pdf, 3.4 MB)
Noise
Measurements On Some Laboratory Power supplies (pdf, 3.4 MB)
Noise Measurements On Some Zener Diodes and Voltage
References
Noise Measurements On Some Voltage Regulators
Frequency Doubler and Distribution Amplifier for Lucent KS-24361 (pdf, 6.7 MB)
Tuning Properties of some commercial VCXOs (pdf, 50 KB)
Getting Logarithmic Sweeps Over 7 Decades With An
Agilent 89441A Vector Signal Analyzer Under Network Remote Control
VHDL modules: Sine /Cosine function for direct digital signal synthesis,
programmable pipeline delays for most standard types,
signed/unsigned/fractional/real/integer conversions:
Sine / cosine package in VHDL (external link to opencores.org)
Power
Up/Down
sequencers in VHDL (external link to opencores.org)