jalinmes
Junior Member level 2
diff pair distortion
Hi
A sine waveform being sent to a nmos diff pair. there is a nmos current source at the bottom and the load is a pair of pmos diode connected.
If the dc voltage level at the input is 3 volt, i got the distorted waveform at the output as shown in the photo. However the transistor actually is biased in saturation. Does anyone know how this happened?
when input is 2.5volt dc bias and send a sine waveform, the fifth harmonic at the output is -80dbc
Yet as being told, if dc voltage is 3 volt, the fifth order is -30dbc
signal is 600KHz
uploaded image is at the link below.
thanks
https://obrazki.elektroda.pl/70_1289230379.jpg
Hi
A sine waveform being sent to a nmos diff pair. there is a nmos current source at the bottom and the load is a pair of pmos diode connected.
If the dc voltage level at the input is 3 volt, i got the distorted waveform at the output as shown in the photo. However the transistor actually is biased in saturation. Does anyone know how this happened?
when input is 2.5volt dc bias and send a sine waveform, the fifth harmonic at the output is -80dbc
Yet as being told, if dc voltage is 3 volt, the fifth order is -30dbc
signal is 600KHz
uploaded image is at the link below.
thanks
https://obrazki.elektroda.pl/70_1289230379.jpg