Use PSpice for behavioral Modeling of VCOs - 12-Dec-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 who design and simulate PLL systems at a behavioral level Design by Dobromir Dobrev, Jet Electronics, Sofia, Bulgaria
Using the LTC6900 Low Power SOT-23 Oscillator as a VCO - DN293 Design Notes__ Linear Technology/Analog Devices
V/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 by W Stephen Woodward, University of North Carolina, Chapel Hill, NC
VCO covers 300MHz to 500MHz based on Maxim MAX2608 VCO - The datasheet says this VCO covers 300 to 500 Mhz, in this test setup with one coil it covers 350 to 475 Mhz with the controlling voltage. The output should be about -10dBm, but it's -20dBm. The stability and sideband noise was not good enough for my HAM radio project, sorry. But I'm sure it will be perfect to be used with a PLL. __ Designed by Thomas Scherrer OZ2CPU
VCO footprints & layout considerations to improve performance - Application Note__ MiniCircuits.com
VCO fundamentals & concepts - Application Note__ MiniCircuits.com
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 by Paul Sofianos, Motorola LICD, Chandler, AZ
VCO produces positive & negative output frequencies - 12/25/03 EDN-Design Ideas - The circuit in Figure 1 is a quadrature-output VCO that provide as both positive and negative output frequencies, depending on the polarity of the control-voltage input. The circuit provide as a function that designers traditionally __ Circuit Design by Henry Walmsley, Farnborough, UK
VCO test methods - Application Note__ MiniCircuits.com
VCO uses programmable logic - 14-Nov-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 by Susanne Nell, Breitenfurt, Austria
VCO using the TL431 reference - 10/10/13 EDN-Design Ideas - The ubiquitous TL431 voltage reference has found something else it’s good at Design by R O Ocaya
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 Page includes
several designs. Scroll to find this one Design by Peter Khairolomour and Alan Li, Analog Devices, San Jose, CA
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 by W Stephen Woodward, University of North Carolina, Chapel Hill, NC
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') __ Designed by Richard Torrens
Voltage Controlled Current Source with Ground Referred Input & Output - A flying capacitor device such as the LTC1043 can produce a precision voltage differential over a wide common mode range. Here it converts a ground referred input voltage directly to a differential voltage across a fixed resistor which then forces a precise current sourced at the circuit output. __ Linear Technology/Analog Devices App Note, Jun 21, 2011
Voltage Controlled Low Frequency Oscillator with Sync - Voltage Controlled Low Frequency Oscillator with Sync__
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 __ Designed by Seiichi Inoue
Voltage Controlled Resistor - Circuit Ideas for Designers App Note__ Advanced Linear Devices, Inc
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 by Yongping Xia, EBT Inc, Torrance, CA
VTSE - Type 1 (Voltage Controlled) Solar Engine - The "Variable Threshold Solar Engine" is Wilf Rigter's 1381-based design -- with a variable "trip" threshold. __ Designed by Wilf Rigter
Vx2SE - Type 1 (Voltage Controlled) Solar Engine - The VTSE uses the popular 1381 chip and that is its main advantage. The potentiometer (or two fixed resistors) connects one leg between the output and input of the 1381 and the other leg to the supply voltage. These resistors acts like a voltage divider when the SE is off and the 1381 output is low. In that case, the voltage that appears at the 1381 input is determined by the ratio of the pot or the two resistors and is usually set for 2 times rated 1381 voltage. __ Designed by Wilf Rigter
Wide Frequency Range 555 VCO - The 555 frequency can be varied via adjusting the voltage at pin 5. However, the range and linearity of frequency adjustment is very limited. This is a way to greatly improve performance using the inverted 555 timer circuit that was previously posted.555 VCO Schematic Current source Q2 is connected in the common base __ Designed by Jim Keith
Wide Modulation Bandwidth Measurements - AN-95-004 Application Note__ MiniCircuits.com
Zener-based - Type 1 (Voltage Controlled) Solar Engine - This design uses a Zener diode to determine the voltage trip level. Simple variants of this design use LEDs or plain old diodes in series to accomplish the same thing. __ Designed by Wilf Rigter |