Precision Narrow Bandwidth Signal Chains

Discussion Oscillator with precise amplitude

State Not Answered
Replies 2 replies
Subscribers 3 subscribers
Views 807 views
Users 0 members are here

Options

Related

Oscillator with precise amplitude

Jeansy78

on Feb 9, 2023

Category: Hardware

Hi,

I want to produce a 100 kHz sine wave with a precision of 1 mV for a peak-peak of 1V.

I found the following application note : https://www.analog.com/en/technical-articles/low-distortion-sine-wave-oscillator-with-precise-rms-amplitude-stability.html

I simulated it but the amplitude of the ouput is always 5V (rail of the LT1632). The max is saturated so the distorsion is huge.

Even when I change the oscillator for a simple signal, the amplitude is not the expected one.

Any idea of this problem ?

Thank you

Tags: hardware

0 dmercer

on Feb 9, 2023 10:09 AM
Hi:

Try looking at this. Is the JFet turning on hard enough to reduce / regulate the gain? Maybe you have an inversion somewhere along the amplitude control loop that is increasing the gain rather than reducing it.
Cancel
Up 0 Down

Reply

Verify Answer

Cancel
0 Jeansy78
on Feb 9, 2023 10:35 AM in reply to dmercer
Hi,

Thank you for your answer. I tried to put a signal in place of the Wien bridge ; the output does not saturate but it still doesn't work. The value of Vset doesn't change anything.

I think there is a mistake in the doc?

Thank you
Cancel
Up 0 Down

Reply

Verify Answer

Cancel