Your EasyEDA usage duration is brief. In order to avoid advertising information, this action is not supported at present. Please extend your EasyEDA usage duration and try again.
Editor Version×
Standard
1.Easy to use and quick to get started
2.The process supports design scales of 300 devices or 1000 pads
3.Supports simple circuit simulation
4.For students, teachers, creators
Profession
1.Brand new interactions and interfaces
2.Smooth support for design sizes of over 5,000 devices or 10,000 pads
3.More rigorous design constraints, more standardized processes
4.For enterprises, more professional users
Ongoing
STD
How to use EasyEDA Schmitt Trigger input logic gates as an oscillator
License: Public Domain
Mode:Editors' pick
3.3k
0
0
0
Update time:
2022-02-17 23:24:58
Creation time:
2016-01-07 13:39:18
Description
Using the EasyEDA SCHMITTINVEE Schmitt Trigger input Inverter gate and
SCHMITTNAND2EE symbol and spice model from the EasyEDA Libs panel to form
relaxation oscillators.
EasyEDA logic device models are different from the basic XSPICE logic gates
in the ngspice because it does not need ADC and DAC Bridges to connect
analogue signals, loads and probes into it.
It is also different from logic gates in many other simulation tools because
it does require a power supply. This is so that if a simulation is run with
the supply ramped up from zero - to assist ngspice in finding the right
initial conditions for the simulation - or if the sim is run at different
supply voltages, then the input threshold levels and the output voltage
swing track the supply voltage. Behavioural logic devices in many other
simulators do not track the supply voltage and this can cause confusion
where logic devices with a wide supply range such as 74C and 4000 series or
some of the low voltage CMOS devices are used with variable or poorly
regulated supplies.
The supply pins for the device are named VDD for the positive and GND for the
negative rails respectively. To reduce the wires needed to be shown in the
schematic, the VDD and GND supply pins for the gate are hidden. To connect to
them all that is needed is for a positive rail with a VDD netlabel and a
negative rail with a GND symbol to exist in the schematic.
If the rails in the schematic have different names, such as RAIL and VSS then
all that is required is to edit the supply pin names. to do this, select U1,
press the 'I' hotkey, edit the supply pin names and then click 'OK'.
Alternatively, the rails can be wired directly to the device supply pins in
the normal way. To do this the device pins must be made visible. Then the
supply rail netlabels have no effect on the supply connectivity to the device.
To do this, select U1, press the 'I' hotkey and untick 'Hidden Pin' to show
the supply pins.
Other features of this EasyEDA logic device are that input and output over-rail
voltage excursions are clamped to the appropriate rail and so will cause
excessive current flow as seen in a real device. A supply voltage above an
absolute maximum of approximately 18V or a reverse polarity will also cause
excessive current flow.
These simulation shows a basic relaxation oscillator and a simple gated version.
Note that either a `.ic` initial condition or a power supply ramp-up from zero
may be required to kick-start the circuit into oscillation.
For more about this see:
https://easyeda.com/Doc/Simulation-eBook/Initial-conditions-and-starting-up-circuits.htm#Initial-conditions-and-starting-up-circuits
To run this simulation: CTRL+R
For more information about the SCHMITTINVEE model, do:
Super Menu > Miscellaneous > Netlist for Document > Spice...
and inspect the netlist.
Forked project will be set private in personal workspace. Do you continue?
Clone
Project
The Pro editor is about to be opened to save as. Do you want to continue?
private message
Send message to andyfierman
Delete
Comment
Are you sure to delete the comment?
Report
How to use EasyEDA Schmitt Trigger input logic gates as an oscillator
No Profile
Announcer: andyfierman
Creation time: 2016-01-07 13:39:18
Published time:
2022-02-17 23:24:58
*
Report type:
Please select report type
*
Report reason:
Please fill in the reason for your report and the content is 2-1000
words
*
Upload image:
+
Upload image
*
Email address:
Please fill in your email address
Report
*
Report type:
Please select report type
*
Report reason:
Please fill in the reason for your report and the content is 2-1000
words
*
Upload image:
+
Upload image
*
Email address:
Please fill in your email address
Report
Submitted successfully! The review result can be viewed in the personal
center, review notification.
Kind tips
Your EasyEDA usage duration is brief. In order to avoid advertising information, this action is
not supported at present. Please extend your EasyEDA usage duration and try again.
Share
Project
Copy
Copy
Scan the QR code and open it on the mobile terminal