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Converters: Voltage to Frequency, Page 2
Voltage Controlled Oscillators (VCO)
VCO; Voltage to Frequency Converters: #'s - A
B - K L - U
V - Z
Last Updated on:
Monday, October 03, 2011 06:07 PM
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Circuits Designed by Dave Johnson, P.E. : |
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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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Links to electronic
circuits, electronic schematics, designs for engineers, hobbyists, students &
inventors:
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Circuit Ideas for IC Converters - AN-343 Analog Devices
Application Notes (app note added 2/06) |
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Circuit performs high-speed voltage-to-current, current to current
conversion - 25-Jul-02 Issue of EDN The circuit in
Figure 1performs active voltage-to-current conversion or acts as a
variable-gain current mirror with high precision and bandwidth. A
typical application is testing high-speed ICs or other devices that
have inputs designed to be driven from current-steering DACs to enable
a modulated voltage source to control the devices..... [Design Idea by
Ali Mehmed, Nokia UK Ltd, Southwood, UK] |
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CMOS Inverter VCO Tunes Octave to UHF - 11/19/98 EDN-Design
Ideas.....A robust and versatile vco provides a stable output to 300
MHz (Figure 1). The circuit's simplicity, unconditional stability, and
consistent high-drive capability over an octave make the oscillator
ideal for many applications, such as synthesized sources, local
oscillators, and transmitters....File has several circuits,
scroll down..... [Design Idea by Shawn Stafford, AM Communications
Inc, Quakertown, PA] |
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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..... [Designed by David A. Johnson] |
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Design Formulas Simplify Classic V/I Converter - 01/20/00 EDN-Design
Ideas EDN is migrating links. This link is not verified. Search
the "title" + EDN for new link. |
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Designs for High Frequency Voltage-To-Frequency Converters - AN14
Linear Technology A variety of high performance V/F circuits is presented.
Included are a 1Hz to 100MHz design, a quartz-stabilized type and a 0.0007)%
linear unit. Other circuits feature 1.5V operation, sine wave output an
nonlinear transfer functions. A separate section examines the trade-offs and
advantages of various approaches to V/F conversion. |
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DPP adds versatility to VFC - 14-Nov-02 Issue of EDN The basic
VFC (voltage-to-frequency converter] in Figure 1 comprises an integrator (IC1]
and a Schmitt-trigger circuit (IC2]. The integrator converts the dc input
voltage, VIN , to a linear voltage ramp, and the Schmitt trigger sets the
limits of the integrator's output voltage. Feedback around both circuits
provides the condition for oscillation..... [Design Idea by Chuck Wojslaw,
Catalyst Semiconductor, Sunnyvale, CA] |
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Field Effect Transistor as a Voltage Controlled Resistor - An fet
can be used as a voltage controlled resistor (vcr) where the resistance
between the drain and source is controlled by the gate-source voltage, …(added
04/05/06) |
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Hippasian nonlinear VFC stretches dynamic range - 19-Feb-09 Issue of
EDN A voltage-to-frequency converter uses square roots to extend dynamic
range by orders of magnitude..... [Design Idea by W Stephen Woodward, Chapel
Hill, NC] |
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Inverters form three-phase VCO - 2-Aug-01 Issue of EDN You
sometimes need an inexpensive VCO that can produce evenly spaced three-phase
outputs over a wide frequency range. You could use tracking all-phase filters
with only one oscillator, but this technique is difficult to implement and
offers limited range. Other methods, such as using a DSP, are feasible, but
they're complex and expensive..... [Design Idea by Al Dutcher, AL Labs, West
Deptford, NJ] |
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Inverting Latches Make Simple VCO - 06/19/97 EDN-Design Ideas.....
EDN is migrating links. This link is not verified. Search the "title"
EDN for new link. |
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VCO; Voltage to Frequency Converters:
#'s - A B - K
L - U V - Z |
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