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Oscillators:
Voltage
Controlled (VCO) Page 4
#'sA B - H
Is T
Z
Oscillator Circuits -- Main Page
Last Updated on:
Friday, June 04, 2021 06:51 AM |
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Circuits Designed by Dave Johnson, P.E. : |
- 40KHz Voltage
to Frequency Converter
This circuit was designed to frequency modulate a 40KHz carrier, using human voice
frequencies. A common flip/flop is used at the core of the circuit.
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- 200MHz
400MHz VOLTAGE controlled OSCILLATOR
If you need a clean emitter coupled logic (ECL) type signal between 200MHz and
400MHz this circuit works fine. It uses four voltage controlled capacitors to change
the frequency.
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- Air
Transparency Monitor, Xenon Flash Receiver
I designed this circuit many years ago to monitor the quality of a mile long column
of air for future optical communications experiments. The transmitter system
(circuit 72 below) uses a powerful xenon flash in conjunction with a large 12 inch
fresnel lens at the transmitter end and a matching 12 inch lens with a PIN photo
diode at the receiver. The receiver system was connected to a weather station and a
computer to collect the changes in intensity of the light flashes under different
weather conditions. It has the potential for a 30+ mile range. I have also used this
system to conduct cloud bounce experiments.
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CMOS
SCHMITT TRIGGER IC MAKES VCO
By changing the supply voltage fed to a classic 4584 Schmitt trigger type
oscillator, the oscillator frequency can be changed over a range of 50:1. A
74HCU04 inverter is used at the output of the 4584 to maintain a constant TTL logic
level signal.
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Light to Frequency Converter
This circuit uses a CMOS
version of the classic 555 timer, to form a light intensity
to frequency converter. A small PIN photo diode is used as the light detector.
The pulses produced are short, so in some applications you may want to stretch them
or feed them through a flip/flop to produce a square wave signal. Although the
circuit shown is designed for a 5v supply, it could operate from almost any voltage
from 3v to 15v.
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Links to electronic circuits, electronic schematics and designs for engineers,
hobbyists, students & inventors:
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Testing Dual-Chip Transistor Arrays for VCO/Buffer Amp Combinations &
Two-Stage Amplifier Applications 11/28/97 - Application Note
California Eastern Laboratories Doc #907)....[App Note] |
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Universal Watchdog Fully Controls µ Preset - 05/25/95 EDN-Design
Ideas....Many µPs contain internal watchdog timers, and you may wonder why
you need another stand-alone circuit. Unfortunately, more highly
integrated functions have preset parameters that you may want. [Design
Idea by Terje Kvinge, Nera AS, Kokstad, Norway] |
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Use PSpice for behavioral-modeling of VCOs - 12-Dec-02 Issue of
EDN PSpice, a member of the Spice family for PC users, is becoming a
standard tool for analog and mixed analog-digital simulation. [Design
Idea by Dobromir Dobrev, Jet Electronics, Sofia, Bulgaria] |
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Using the LTC6900 Low Power SOT-23 Oscillator as a VCO - DN293 Design
Notes (Linear Technology) (App Note added 1/06) |
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VCO footprints & layout considerations to improve performance - Application
Note MiniCircuits.com (App Note added 2/06) |
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VCO fundementals & concepts - Application Note MiniCircuits.com (app
note added 2/06) |
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VCO has Digitally Programmable Center Frequency - 04/25/96 EDN-Design
Ideas....The circuits in Figure 1 illustrates a narrowband VCO, which has a digitally
programmable center-frequency ratio of greater than 2-to-1. With a VCO having
center-frequency ratio (F HIGH/FLOW]of greater than 2-to-1, you can derive any output
frequency by simple binary division. [Design Idea by Paul Sofianos, Motorola LICD,
Chandler, AZ] |
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VCO produces positive and negative output frequencies - 25-Dec-03 Issue of
EDN The circuit in Figure 1 is a quadrature-output VCO that provides both
positive and negative output frequencies, depending on the polarity of the
control-voltage input. The circuit provides a function that designers traditionally
implement in analog music-effects units, such as Bode/Moog frequency shifters.
[Design Idea by Henry Walmsley, Farnborough, UK] |
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VCO test methods - Application Note MiniCircuits.com (App Note added
2/06) |
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VCO uses programmable logic - 14-Nov-02 Issue of EDN A VCO
(voltage-controlled oscillator] is an analog circuit, so you cannot find it in the
libraries for the design of digital programmable chips. When you need such a circuit
for synchronization or clock multiplication, you need to find a circuit that works
with the standard digital functions, such as AND and NAND. [Design Idea by Susanne
Nell, Breitenfurt, Austria] |
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Volt/F Converter Draws Flea Power - 04/24/97 EDN-Design Ideas ....The V/F
converter in Figure 1 is unique because it draws less than 30 µA from one unregulated
supply while converting bipolar input voltages. It produces three CMOS
-compatible,0to
10-kHz outputs one (F+]that becomes active when the input voltage is positive,
another (F]that takes. [Design Idea by W Stephen Woodward, University of North
Carolina, Chapel Hill, NC] |
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Voltage Controlled Amplifier - In truth this, like many (most) VCAs is
really a current controlled Amplifier but there is really not too much difference
since if you want to turn a CCA into a VCA you simply feed the current input from a
voltage via a voltage to current converter (a.k.a. 'resistor')....(circuit / schematic
design added 6/06) |
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Voltage controlled oscillator - VCO, Voltage controlled oscillator
circuit,… (Circuit design added 07/07/07) |
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Voltage Controlled Resistor - Circuit Ideas for Designers Application Notes
Advanced Linear Devices, Inc....[App Note] |
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Voltage Controls Sine Wave Frequency - 08/17/95 EDN-Design Ideas ....The
circuit in Fig 1 generates a 50-Hz to 1-kHz sinusoidal waveform that exhibits lower
than 60-dB THD. The input voltage controls the output frequency with the relationship
1 kHz/V. The output Amplitude is invariant with frequency over the entire operating
range. IC1 is a V/F converter. [Design Idea by Yongping Xia, EBT Inc, Torrance, CA] |
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Voltage to Frequency Converter + 1uS LED Pulse Driver - This circuit
receives the signal from the above Amplifier and launches powerful 1uS infrared light
pulses from a low cost LED that are frequency modulated by the audio information. The
10KHz center frequency of the pulse stream is low enough so a standard infrared LED
can emit ten times more light than conventional long pulse techniques. The circuit is
described in more detail in the transmitter section of my Handbook of Optical Through
the Air Communications. …. [Designed by David A. Johnson] |
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Wide Band Zero Cross Detector - This circuit was designed to convert a low
Amplitude 40KHz signal into a clean square wave signal. It will work with inputs
as small as 5mv peak-to-peak or as large as 3 volts peak to peak. The input
frequency can range from a few kilohertz to about 150KHz. …. [Designed by David A.
Johnson] |
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Wide Modulation Bandwidth Measurements - AN-95-004 Application Note
MiniCircuits.com (App Note added 08/08/08) |
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