Checking out the Pierce oscillator

Posted on Feb 4, 2014

The Pierce oscillator is a very simple circuit and as with the ring oscillator also uses inverters (actually just one inverter will do). The principle of operation, however, is very different. While the ring oscillator exploits the incremental propagation delay through the series of inverters, the Pierce oscillator puts the inverter/gate into the

Click here to download the full size of the above Circuit.

linear region of operation and employs it as an analog amplifier. To find out the details of the gate-based Pierce oscillator I recommend reading the references listed below. What follows is just a summary of the tips and formulas culled from the said references, pointers and tidbits which I found useful in getting a crystal-based oscillator up and running. I also did a number of breadboarded experiments and the results are shown below. INV is of course the inverter (buffered or unbuffered). Oscillator signal is taken from the inverter output (Vout). To improve (decrease) its rise/fall time, another inverter or, better yet, a (fast!) Schmitt trigger can be used to spruce up the signal. The signal at the inverter input is a sinusoid and can also be used (some Microchip MCU datasheets show the clock signal being derived from the input of the inverter while other Microchip datasheets show it being taken from the inverter output). Rf is a feedback resistor that puts the gate in linear (as opposed to digital) mode operation. The following table provides a rule of thumb value for Rf given crystal frequency: Among other things, Rs limits the amount of crystal drive-increasing Rs decreases drive. A ballpark figure or first cut value for Rs can be derived by computing for and equating Rs to the reactance of Cb: Rs is typically 40 K ohms or less, but is almost never more than 100 K ohms. If the value for Rs is too high, then the high...

Visit page

Leave Comment

characters left:

Related Circuits

Color sensor

Color sensor. Colour sensor is an interesting project for hobbyists. The cir- cuit can sense eight colours, i.e. blue, green and red (primary colours); magenta, yellow.

Dew sensor

Dew sensor. Dew (condensed moisture) ad- versely affects the normal per- formance of sensitive electronic devices. A low-cost circuit described here can be used to.

Audio Visual Ringer

Audio Visual Ringer. Many a times one needs an extra telephone ringer in an ad-joining room to know if there is an incoming call. For example, if the telephone is installed in.

Multipurpose Circuit for telephone

Multipurpose Circuit for telephone. This add-on device for telephones can be connected in parallel to the telephone instrument. The circuit provides audio-visual indication of on-hook,.

Off line Telephone tester

Off line Telephone tester. Here is a circuit of an off-line telephone tester which does not require any telephone line for testing a telephone instrument. The circuit is so simple that.

Telephone Headgear

Telephone Headgear. Acompact, inexpensive and low component count telecom head- set can be constructed using two readily available transistors and a few other electronic.

Telephone line based audio muting and light on circuit

Telephone line based audio muting and light on circuit. Very often when enjoying music or watching TV at high audio level, we may not be able to hear a telephone ring and thus miss an important...

Telephone Ringer using 556 dual timers

Telephone Ringer using 556 dual timers. Using modulated rectangular waves of different time periods, The circuit presented here produces ringing tones similar to those produced by a telephone. The.

New Circuits

Zero consumption Anti-theft High power Code Switch for E-Bike Batteries

This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
Ultrasonic distance finder circuit

The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Simple Metal detector circuit with CD4030

Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Fully automatic watering circuit for flower pots

Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
Simple deep searching metal detector circuit

The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
Sub-Harmonic Bass Converter for Electric Guitars

The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
Echo Depth Sounding Sonar for Boats

In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
100W HiFi Audio Amplifier Circuit

This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
Plant-Pot Water Level Indicator Circuit

A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....

Create NOW your QR MENU for your Restaurant / Hotel / Bar / Caffe,

Comprehensive ordering/paying features. fully personalized to suit your Business.

Update Anytime! Easy and Simple!

Popular Circuits

Doorbell light for the Deaf

This circuit provides a delayed visual indication when a door bell switch is pressed. In...

Busy Telephone line Indicator

Have you ever been using the modem or fax and someone else picks up the phone, breaking the...

PIC18 programmer

The SCHAER+ programmer is a programmer for PIC18 family from a PC parallel port (LPT). It is...

LED dimmer circuit

Typical segment displays LEDs consume around 25 mA for each segment and should be limited to it...

adding audio to arduino projects

One incredibly simple solution to getting more sound from a micro controller is the LM386 series...

pll fm demodulator

This is a circuit about PLL system that can be used to implement an FM demodulator. Since the VCO...

1997 Buick Century the headlight relay

I would start by making certain that no light bulbs on the vehicle are burnt out, particularly...

Actuator circuit

This controller is essentially 3 pairs of LED sensors in a 3G -bridge configuration. The driver...

Sanyo 83P switching power supply circuit diagram

Oscillation: C310 positive terminal voltage of about 300V, the R311, R312 is applied to the...

Both tube OTL amplifier 01

Electrical properties of the tube with good quality output transformer has a great relationship,...