r.mirtaji
Junior Member level 3
Hello friends
In order to obtain the dynamic characteristics of the R-2R converter, I used the test bench circuit shown in the figure below.
I have three questions
1-In order for harmonics of the input sine wave to occur in the output, should the S transistor switches be used to apply voltage to the gate transistors(M2,M3,M6,M7)?
That is, they(S switches) cause non-linearity in the output of S switches
Is it not possible to use the ideal ADC output(ideal digital signal) directly to connect to the gate transistors.
In most cases, d-type flip-flops are used to apply the input digital signal to the dac, the reason for which is to reduce the glitch error in the output and the synchronization between the input codes
The cause of non-linearity that causes the harmonics of the input signal in the output are switches s or disconnection and connection of transistors m2 and m3.
2-Is it necessary to use the low pass filter output to get fft or can the output current of dac be used?
3-Is the largest spur related to the main harmonics of the input sinusoidal signal?
In order to measure SFDR, the largest spur amplitude must occur at the harmonic frequencies of the input signal
third harmonic=2*F(fundamental) or 3*F(fundamental)
We know that the second or third harmonic is the largest harmonic
Thanks
In order to obtain the dynamic characteristics of the R-2R converter, I used the test bench circuit shown in the figure below.
I have three questions
1-In order for harmonics of the input sine wave to occur in the output, should the S transistor switches be used to apply voltage to the gate transistors(M2,M3,M6,M7)?
That is, they(S switches) cause non-linearity in the output of S switches
Is it not possible to use the ideal ADC output(ideal digital signal) directly to connect to the gate transistors.
In most cases, d-type flip-flops are used to apply the input digital signal to the dac, the reason for which is to reduce the glitch error in the output and the synchronization between the input codes
The cause of non-linearity that causes the harmonics of the input signal in the output are switches s or disconnection and connection of transistors m2 and m3.
2-Is it necessary to use the low pass filter output to get fft or can the output current of dac be used?
3-Is the largest spur related to the main harmonics of the input sinusoidal signal?
In order to measure SFDR, the largest spur amplitude must occur at the harmonic frequencies of the input signal
third harmonic=2*F(fundamental) or 3*F(fundamental)
We know that the second or third harmonic is the largest harmonic
Thanks
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