Bubba oscillator - damped output

Prathamesh dhanpalwar

Hello,

I am trying to stimulate the very basic example of bubba oscillator and the output I am getting is getting damped. I know there's something wrong but not able to find out where. Can anyone help me in this?

I am also attaching the snapshot and the schematic file.

2133.test_bubba.TSC

over 10 years ago

0 Deepak%20murali over 10 years ago

Expert 1095 points

Hi Prathamesh dhanpalwar,

Try increasing the gain of U1 amplifier. Use 300 KOhm instead of 350KOhm. Your exponentially decreasing sinusoidal signal will become sinusoidal signal.

0 Prathamesh dhanpalwar over 10 years ago in reply to Deepak%20murali

Intellectual 450 points

`Hello, I actually did that and got it. But my actual motive is to generate a sine wave of 150Khz. I am using 10ohmss and 100nf RC values, but not able to get the output. Here is the sapshot.

0 Marek Lis over 10 years ago in reply to Prathamesh dhanpalwar

TI__Guru 64530 points

Prathamesh,

Increasing the gain by lowering R6 resistor to 300k does generate undamped sinusoidal wavform - see below.

Of course, the component values you chose results in 60Hz signal and you cannot achive desired f=150kHz signal with TLV247XA because its slew rate is too low - see below.

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Bubba oscillator - damped output