Micropower VCO (Voltage-Controlled Oscillator)

This is a schematic diagram of a micropower voltage-controlled oscillator circuit. This circuit can generate square and triangle wave outputs and only need 50µA from a single 5 V supply. This circuit consist of combination of an  inexpensive quad CMOS switch and two OP90s. Here is schematic diagram of the  the circuit :

Micropower Voltage Controlled Oscillator circuit schematic diagram
The integrator in this circuit is A1. The charging current is switched to yield negative and positive ramps symmetrically by S1. A2 acts as Schmitt trigger with a precise hysteresis of 1.67 V and set by R6, R7, R5 and associated CMOS switches. A2 bounds the integrator. The resulting output of A1 is a triangular wave with lower and upper levels of 1.67V and 3.33V. The frequency of this circuit is determined by following equation:

fout=Vcontrol(V) x 10 Hz/V

The frequency can be changed easily by varying C1. This circuit can operate well up to a few hundred hertz. [Circuit’s schematic diagram source: Analog Application Note]

This entry was posted in Oscillators and tagged , , . Bookmark the permalink.,
Possibly Related to "Micropower VCO (Voltage-Controlled Oscillator)" Circuits

  • 10 Hz to 10 Khz Voltage Controlled Oscillator
    Voltage-controlled oscillator (VCO)  is an oscillator that its frequency is controlled using a voltage signal.  The VCO described here provide both triangular and square wave output. The control voltage can be varied between 5 mV to 5 V, to produce … Continue reading →...
  • 1.5V Micropower CMOS Voltage Regulator
    The LP3992 is Micropower CMOS Voltage Regulator with input range of 1.9 to 5.2V and can produce 1.5V output. This regulator suits for application that need an accurate output voltage with power from battery, low quiescent current, low noise and … Continue reading →...
  • Voltage Controlled Oscillator for Commercial FM Band
    VCO (voltage controlled oscillator) is an electronic signal generator which produce a signal that has variable frequency depends on a voltage level at its control input. Many VCO circuits are based on ramp generator to produce a variable frequency output, … Continue reading →...
  • PWM Modulator Using Op-Amp
    This is a simple PWM modulator circuit. Comparing the message signal to a ramp or triangular waveform is the simplest way to produce a PWM signal. When the input is greater than the triangular waveform (the carrier), the resulting output … Continue reading →...
  • Oscillator With Quadrature Output Using 567 IC
    Oscillator circuit is an electronic circuit that produce a periodic signal. The term quadrature refers to a fourth (1/4) phase shift of full wave cycle (1/4 of 360′ = 90′). In square wave oscillator, a quadrature simply means a 1/4 … Continue reading →...

Comments are closed.