Converters - Voltage to Frequency and Voltage Controlled Oscillators (VCO), page 2

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

Circuits Designed by Dave Johnson, P.E. :

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.

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Circuit Ideas for IC Converters - AN-343 Analog Devices Application Notes (app note added 2/06)

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]

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]

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]

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.

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.

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]

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)

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]

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]

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.

VCO; Voltage to Frequency Converters: #'s - A B - K L - U V - Z