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Thank you for your response.
I used its s-parameter file (s2p) directly in the Cadence. I just want to have an overview of its equivalent model to find out how much inductor, resistor, and capacitor it adds to the circuit.
Regards,
Hi everyone,
I wanted to apply the bond wire effect on my designed amplifier and to do this, I used HFSS to model the wire bond and used the s2p export file to apply in the circuit schematic at Cadence. Now, I want to know the exact value of the caps, inductor, and resistor in the bond wire...
I tried to connect two amplifiers in series together without any oscillation and 40 to 50 dB voltage gain for each one. In the signal analyzer, I could achieve an 84 dB voltage gain. However, the signal at the oscilloscope could not be detectable. Because the internal noise of the amplifier is...
Thank you for your response.
I must design for the second time. However, the first one has some results with 60 to 70 dB gain, less than 1 nV/sqrt(Hz), and BW higher than 250 MHz.
But the design is for gain higher than 80 dB. Power consumption is the same as the schematic.
However, I am so...
Can you shift the spurious frequency with your grounded finger easily? No
Would a grounded lid improve it? No
Perhaps the common DC bias affects gm too fast and needs damping. .i.e. Is there an error amplifier for Vcm-out to Vcm-in? Sorry, I didn't understand it.
Do you have on-chip damping...
Thank you for your response. At this time the problem is not parasitic oscillations, the problem is that when I apply any input signal to the differential input nodes, I see some parasitic signals in the spectrum around the high frequencies. However, when I turn the input signal off, these...
This is an integrated circuit design.
The structure is so simple. 4-stage amplifier. Every stage is a simple fully differential amplifier using an inverter-based structure.
Hello,
I have designed a wideband ultra-low noise high gain amplifier with a voltage gain higher than 80 dB, input referred noise less than 1 (nV/sqrtHz), and a BW higher than 250 MHz. However, it is oscillating in higher gain, and I have to reduce the gain to achieve some measurement results...
Thank you for your attention.
The name of book is "Analog CMOS Integrated Circuits" written by Behzad Razavi.
Page 121 and page 200
As it has been mentioned there, high frequency noises come from power supply, can reduce the performance of the FDA.
1707842605
Thank you for your complete...
Thank you for your attention on this matter.
Would a low-ohm resistor be series with the power supply? I got a bit confused due to the two resistors. Will there be two resistors?
Regarding frequency of noise, I did not use any inductors in my circuit to have resonance frequency. However, the...
Hi everyone,
I want to simulate the power supply noise and its effect on an amplifier performance using Cadence Virtuoso. Is there anyone who knows how to do this?
I want to model its effect before fabrication and see how can I solve any upcoming problems.
Regards,
That is a good point. As I wire bonded to PCB with long wire bonds, it is probable to oscillate due to this reason. Also, one of the main oscillation frequencies is this one. I changed the output wire bond lengths for one die by about 30% and could measure it. The gain was 60 dB, and the 3-dB...
Thank you for your attention. According to the bond wire effect, I simulated its effect before fabrication. Also, I remove the package and socket and directly wire bond to the PCB. However, the bond wires are so long in this situation (about 1 cm for each one).
Due to weak decoupling and an...
Thank you for your response.
I separated the psu of the first stage VDD from the others with 1V. Also, the last stage is buffer working with 2.5V psu. I soldered 100pF, 10nF, 220nF, and 1uF decoupling caps to filter the noises. Also, Inside of the layout I put decoupling caps for power supply...
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