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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:
Friday, October 16, 2009 03:41 AM
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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 -
07/25/02 EDN-Design Ideas: In low-power, single-supply analog
applications, it is often desirable to maintain precise control of voltages much
greater than the positive-supply rail. The circuit in Figure 1 allows you to
amplify the input voltage, VIN, by a factor, A, which resistors R1 and R2 set. The
output voltage, VOUT, equals AVIN, where A=R2/(R1+R2).....(design idea added
01/04) |
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CMOS Inverter VCO Tunes Octave to UHF - 11/19/98 EDN-Design Ideas:.....(design
idea added 3/03) |
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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:.....(design idea added 7/03) |
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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 - 11/14/02 EDN-Design Ideas: 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 added 1/05) |
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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 - 02/19/09 EDN-Design Ideas: ,
A voltage-to-frequency converter uses square roots to extend dynamic range by
orders of magnitude.....(design idea added 08/09) |
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Inverters Form Three Phase VCO - 08/02/01 EDN-Design Ideas: 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 added 1/05) |
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Inverting Latches Make Simple VCO - 06/19/97 EDN-Design Ideas: (design idea
added 3/03) |
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VCO; Voltage to Frequency Converters:
#'s - A B - K
L - U V - Z |
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