|
0.02% V/F converter consumes only 26 µA - 07/04/96 EDN-Design Ideas: (design idea
added 11/05) |
|
10 Khz VFC uses Charge Pump Variation - 04/09/98 EDN-Design Ideas: In telemetry or
security applications in which a modem connection automatically establishes itself
between two systems, a failure in one of systems can interrupt data
exchange while connection remains.....(design idea added 3/03) |
|
200mhz-400mhz Voltage Controlled Oscillator (VCO) - 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. ….(designed by David
A. Johnson) |
|
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. ….(designed by David A. Johnson) |
|
8 pin µC forms one chip Programmable VCO - 09/24/98 EDN-Design Ideas: The circuit
in Figure 1 uses a Microchip 8-pin µC (PIC12C671)as a voltage-controlled oscillator (VCO).
Because PIC12C671 has an internal 4-MHz oscillator, four-channel 8-bit A/D
converters, and built-in power-reset circuitry, you need no external components to
configure VCO. The µC reads two analog inputs through AN0 and AN1.....(design
idea added 6/06) |
|
90 MHz voltage controlled oscillator for FM Band - Notice the abundance of
2N4401, 1 k resistors and 330 Ohm resistors? That's because I have a lot of each.
2N4401's weren't intended to be used as varactors, but they work just fine. Don't be
afraid to xperiment with the parts you have on hand. Build this on a ground plane
board. Layout is important..(schematic / circuit added 6/07) |
|
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. ….(designed by David A. Johnson) |
|
Air Transparency Monitor, Xenon Flash Receiver, Page 2 - This is Page 2 of the air
transparency monitor receiver circuit. ….(designed by David A. Johnson) |
|
AN-1174: Startup Time[comma] Profile Measurement of PLL VCOs & Crystal Oscillators
- National Semiconductor Application Note (app note added 6/06) |
|
AN-213: Low Cost, Two-Chip, Voltage-Controlled Amplifier & Video Switch - AN-213
Analog Devices Application Notes (app note added 6/06) |
|
AN-45-001 Automated load measurement of VCO's - Application Note MiniCircuits.com
(app note added 2/06) |
|
AN-45-002 Line Stretchers Ease VCO Load-Pull Testing - Application Note
MiniCircuits.com (app note added 2/06) |
|
AN-95-003 Glossary of VCO terms - Application Note MiniCircuits.com (app
note added 2/06) |
|
AN-95-004 Wide Modulation Bandwidth Measurements - Application Note
MiniCircuits.com (app note added 2/06) |
|
AN-95-005 How VCO Parameters Affect Each Other - Application Note
MiniCircuits.com (app note added 2/06) |
|
AN-95-006 Optimizing VCO/PLL Evaluations & PLL Synthesizer Designs - Application
Note MiniCircuits.com (app note added 2/06) |
|
Analog voltage controls Digital potentiometer - 03/20/08 EDN-Design Ideas: A
microcontroller with an internal ADC controls a digital potentiometer via an I2C
interface.....(design idea added 09/08) |
|
Automated load measurement of VCO's - AN-45-001 Application Note MiniCircuits.com
(app note added 08/08/08) |
|
Behavioral SPICE model emulates VCO - 07/06/95 EDN-Design Ideas: A behavioral
model treats a circuit as a black box, which you can describe using an equation or
table. Listing 1 is a Microsim PSpice behavioral model that simulates the operation of
a voltage-controlled oscillator (VCO). The output signal of a VCO is
VO=Aβsin(2ãfOt), where A is the amplitude, t is the time variable.....(design
idea added 11/05) |
|
Characterizing & minimizing VCO phase noise - Application Note MiniCircuits.com
(app note added 08/08/08) |
|
CMOS Inverter VCO tunes octave to UHF - 11/19/98 EDN-Design Ideas:.....(design
idea added 3/03) |
|
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) |
|
DAC & OpAmp Provide Variable Control Voltage - 12/06/01 EDN-Design Ideas: Early
DACs contained standard R-2R ladder networks, and produced a negative output voltage.
These early DACs, such as MAX7837/7847 and MAX523, require both positive
and negative supply rails to accommodate ir negative output. With transition to
single-supply ICs, however, many modern DACs operate with a single supply rail and an
inverted R-2R ladder network.....(design idea added 6/06) |
|
Design features of a synthesizer using Mini-Circuits VCOs - Application Note
MiniCircuits.com (app note added 08/08/08) |
|
Designing VCOs & Buffers Using the UPA family of Dual Transistors 3/99 -
Application Note California Eastern Laboratories Doc #927 (app note added 6/06) |
|
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) |
|
Enhanced three phase VCO features ground referenced outputs - 01/19/06 EDN-Design
Ideas: Additional components overcome limitations of earlier Design Idea.....(design
idea added 09/06) |
|
Enhancing CLC031 Jitter Performance with Easy-To-Use VCXOs - National
Semiconductor Application Note (app note added 2/06) |
|
GBSE: Gate Boost Solar Engine - Voltage-Controlled Solar Engine: The "Gate Boost
Solar Engine" is a new (6/2002) Wilf Rigter 1381-based design. This uses an internal
voltage doubler to turn on a FET more efficiently. (added 11/05) |
|
Glossary of VCO terms AN-95-003 - Application Note MiniCircuits.com (app
note added 08/08/08) |
|
How VCO Parameters Affect Each Other - AN-95-005 Application Note
MiniCircuits.com (app note added 04/05/06) |
|
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.... (added 12/04) |
|
Inverting Latches Make Simple VCO - 06/19/97 EDN-Design Ideas: The output
frequency of the simple VCO in Figure 1, which is synthesized from inverting latch
stages, is tunable to an integer multiple of the input frequency by selecting which
output phases feed back to the input multiplexer. The circuit.....(design idea added
3/03) |
|
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. ….(designed by David A. Johnson) |
|
Line Stretchers Ease VCO Load-Pull Testing - AN-45-002 Application Note
MiniCircuits.com (app note added 04/05/06) |
|
Low Cost Circuit Biases VCOs for Cable & TV - 11/20/97 EDN-Design Ideas:
-PLLs are useful in a variety of applications, most notably cable and TV
tuners.....(design idea added 6/06) |
|
Multilayer capacitor doubles as varactor - 03/20/03 EDN-Design Ideas: The main
purpose for building the circuit in Figure 1 is to study the idiosyncrasies of X5R,
Z5U, and Y5V multilayer ceramic capacitors. The circuit is also an inexpensive VCO
(voltage-controlled oscillator)with only five components. Many types of ceramic
capacitors for surface-mount placement are on the market.....(design idea added 1/05) |
|
Optimizing VCO/PLL Evaluations & PLL Synthesizer Designs - AN-95-006 Application
Note MiniCircuits.com (app note added 04/05/06) |
|
Phase locked loop fundamentals - Application Note MiniCircuits.com (app note
added 04/05/06) |
|
Precision voltage controlled current sink tests power supplies - 03/20/08 EDN-Design
Ideas: A simple voltage-driven current sink allow you to test the dynamic behavior of
power supplies.....(design idea added 04/08) |
|
Programmable Clock Oscillator - voltage controller oscillator that was designed as
a wide range oscillator to generate clock pulses for a stepper motor drive system,
frequency could be varied over1,000,000:1 (added 5/02) |
|
Reducing power supply noise in VCO's - Application Note MiniCircuits.com
(app note added 04/05/06) |
|
Reverse bias oscillator - There are a number of npn transistors that will
oscillate in the audio range when reverse biased. Minimum supply voltage is 7V for low
power transistors such as BC109, BC238 and 2N2222A (about 10V for the latter), it
becomes 12V for medium power transistors such as BD139 and is 16V for power
transistors as BUX22 and 2N6543....(added 08/08/08) |
|
Simple VCOM adjustment uses any Logic Supply Voltage - 09/30/04 EDN-Design Ideas:
All TFT (thin-film-transistor)LCD panels require at least one appropriately tuned VCOM
signal to provide a reference point for the panel's backplane. The exact value of VCOM
varies from panel to panel, so the manufacturer must program the voltage at the
factory to match the characteristics of each screen.....(design idea added 6/06) |
|
Startup Time[comma] Profile Measurement of PLL VCOs & Crystal Oscillators -
National Semiconductor Application Note (app note added 6/06) |
|
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 added 6/06) |
|
Trimless IF VCO: Part 1: Design Considerations - This App Note explores the design
fundamentals needed to implement a trimless, fixed-frequency, IF voltage-controlled
oscillator (VCO) and points out the challenges in guaranteeing proper circuit
operation. VCOs are essential components in the architecture of most wireless systems.
In dual-conversion approaches, a fixed-frequency.... APP 711: Feb 05, 2001
(app note added 02/05) |
|
Universal Watchdog Fully Controls µ Preset - 05/25/95 EDN-Design
Ideas:.....(design idea added 3/03) |
|
Use PSPICE for Behavioral modeling of VCOs - 12/12/02 EDN-Design Ideas: PSpice, a
member of the Spice family for PC users, is becoming a standard tool for analog and
mixed analog-digital simulation. Many analog designers are familiar with the software
of Design Center, Design Lab, and OrCad (www.orcad.com)PSpice and use the software in
their everyday lives. This Design Idea should be helpful to those.....(design idea
added 1/05) |
|
Using the LTC6900 Low Power SOT-23 Oscillator as a VCO - DN293 Design Notes
(Linear Technology) (app note added 1/06) |
|
VCO 1420MHz...2250MHz - (electronic circuit added 6/07) |
|
VCO footprints & layout considerations to improve performance - Application Note
MiniCircuits.com (app note added 2/06) |
|
VCO fundementals & concepts - Application Note MiniCircuits.com (app note
added 2/06) |
|
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 added 3/03) |
|
VCO produces positive & negative output frequencies - 12/25/03 EDN-Design Ideas:
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 added 1/05) |
|
VCO test methods - Application Note MiniCircuits.com (app note added 2/06) |
|
VCO test 1000MHz...1500MHz - (electronic circuit added 6/07) |
|
VCO test 1300MHz...2400MHz - (electronic circuit added 6/07) |
|
VCO uses Programmable logic - 11/14/02 EDN-Design Ideas: 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 added 1/05) |
|
VCO 1000MHz...1500MHz - (electronic circuit added 6/07) |
|
VCO 1200MHz...2400MHz - (electronic circuit added 6/07) |
|
VCO 144MHz...146MHz - (electronic circuit added 6/07) |
|
VCO 15MHz...25MHz - (electronic circuit added 6/07) |
|
VCO 350MHz...1000MHz - (electronic circuit added 6/07) |
|
VCO 450MHz...1000MHz - (electronic circuit added 6/07) |
|
VCOM Adjustment uses Any Logic Supply Voltage - 09/30/04 EDN-Design Ideas: All TFT
(thin-film-transistor)LCD panels require at least one appropriately tuned VCOM signal
to provide a reference point for the panel's backplane. The exact value of VCOM varies
from panel to panel, so the manufacturer must program the voltage at the factory to
match the characteristics of each screen.....(design idea added 6/06) |
|
Versatile Monolithic Volt/Fs can Compute as Well as Convert with High Accuracy
- National Semiconductor Application Note 04-Nov-1995 (app note added 4/02) |
|
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,0- to
10-kHz outputs: one (F+)that becomes active when the input voltage is positive,
another (F)that takes over for negative inputs, and a third (FABS)that produces a
frequency proportional to the absolute value of the input. Linearity is better
than0.1%, and the full-scale span and offset drift are typically less than 100 ppm/ºC
and 2 µV/ºC, respectively.....(design idea added 3/03) |
|
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) |
|
Voltage Controlled Low Frequency Oscillator with Sync - Voltage Controlled Low
Frequency Oscillator with Sync (added 08/08/08) |
|
Voltage controlled oscillator - VCO, Voltage controlled oscillator circuit,…
(circuit design added 07/07/07) |
|
Voltage Controlled Oscillator (Randy Linscott) - ….(added 08/08/08) |
|
Voltage Controlled Oscillator VCO - The oscillation frequency of the voltage
controlled oscillator is controlled by the output of the PLL synthesizer and does the
stable oscillation of 119.3 MHz. (app note added 02/06) |
|
Voltage Controlled Resistor - Circuit Ideas for Designers Application Notes
Advanced Linear Devices, Inc. (app note added 6/06) |
|
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 added 3/03) |
|
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) |
|
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) |
|
Wide Modulation Bandwidth Measurements - AN-95-004 Application Note
MiniCircuits.com (app note added 08/08/08) |
