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STD Amplitude stabilised Colpitts Oscillator
Mode: Editors' pick
- 0
Update time：
2021-04-09 19:33:39
Creation time：
2015-04-29 22:15:40
Description
A modified version of the circuit at:
http://electronics.stackexchange.com/questions/165259/need-help-understanding-oscillator-circuit
The original circuit is overly complex and does
not appear to work very well. The circuit can be
massively simplified however the version shown
here has been modified to minimise changes to the
original circuit.
This simulation shows that it stabilises the
output amplitude over the temperature range of
-20degC to +70degC.
Please note however that the temperature
performance of the Analog Devices OP275 models
is unclear.
signality.co.uk
To run this simulation:
Click on the little green pencil in the
upper right of the view window then do;
CTRL+R
Save when prompted then:
CTRL+R
Design Drawing
schematic diagram
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Amplitude stabilised Colpitts oscillator original design fixed 01
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Original design
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Amplitude stabilised Colpitts oscillator simplified design 01
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| ID | Name | Designator | Footprint | Quantity |
|---|---|---|---|---|
| 1 | PULSE(0 {VCC} 0 10u) | V1 | 2P-5.0 | 1 |
| 2 | BC547C | Q1 | SOT23 | 1 |
| 3 | 27p | C1,C5 | 1206 | 2 |
| 4 | 10n | C2,C4,C7,C6 | 1206 | 4 |
| 5 | 820p | C3 | 1206 | 1 |
| 6 | PULSE(0 {VCC/2} 0 10u) | V3 | 2P-5.0 | 1 |
| 7 | 100k | R1,R4,R13 | R3 | 3 |
| 8 | OP275 | U1,U2,U4,U3 | DIP08 | 4 |
| 9 | 1m | R3 | R3 | 1 |
| 10 | 300k | R6,R7,R14 | R3 | 3 |
| 11 | 1.5p | C5 | 1206 | 1 |
| 12 | 2.7k | R13 | R3 | 1 |
| 13 | 100 | R5,R2,R6,R11 | R3 | 4 |
| 14 | 22k | R9,R10 | R3 | 2 |
| 15 | 6.8k | R12 | R3 | 1 |
| 16 | 650u | L1 | INDUCTOR-1206 | 1 |
| 17 | {650u/(8**2)} | L2 | INDUCTOR-1206 | 1 |
| 18 | BAT54 | D1,D2 | SOT23 | 2 |
| 19 | 1k | R11,R5 | R3 | 2 |
| 20 | 10Meg | R2 | R3 | 1 |
| 21 | 52k | R1 | R3 | 1 |
| 22 | 30k | R3 | R3 | 1 |
| 23 | 432k | R7 | R3 | 1 |
| 24 | 1.5u | C5 | 1206 | 1 |
| 25 | 10k | R8,R12 | R3 | 2 |
| 26 | 3.9k | R9,R13 | R3 | 2 |
| 27 | 680p | C6 | 1206 | 1 |
| 28 | 220p | C7 | 1206 | 1 |
| 29 | 33p | C8 | 1206 | 1 |
| 30 | {VCC} | V1 | 2P-5.0 | 1 |
| 31 | PULSE({VCC/2} {VCC/2+0.01} 1u 10n 10n 10n) | V3 | 2P-5.0 | 1 |
| 32 | 1Meg | R8,R9 | R3 | 2 |
| 33 | 1k | R2 | TRIM_POT_PTH | 1 |
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