Troubleshooting Rectifier Design with Cross-Coupled MOSFETs and Driver Circuits

In summary, the conversation discusses a modified design for a cross-coupled gate structure of MOSFETs used for rectification of low ac input voltages. The design includes driver circuits for both NMOS and PMOS, but the Hi pin is always zero, potentially due to a problem with the selection of voltages for VBN and VBP. The speaker also mentions potential issues with the VBN VBP MOS ladders and questions the circuit's use of sub-threshold logic. They ask for clarification and request a reference for the circuit's source. They also inquire about the process being used.
  • #1
shaikss
33
0
Hi,

I have started with cross-coupled gate structure of MOSFETs. This structure is for rectification of very low ac input voltages. I have found few problems like reverse leakage current and MOS not switching completely ON and OFF.

So, I modified the design by using driver circuits for both NMOS and PMOSes used in my circuit.

But I find the Hi pin as zero always.
Can you please let me know why it is happening so?
IS there any problem in selection of voltages for VBN and VBP?

Please clarify.

PS: This is not a HOMEWORK problem.
 

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  • #2
I think there is some problem in VBN VBP MOS ladders. where GN/GP/+/- signals are generated. I think you MOS are not biased properly.

However, I may be wrong as I don't recognize your circuit clearly. Can you reference me the book or resource where you have found the circuit? Is this sub-threshold logic?

BTW, what process are you using?
 

FAQ: Troubleshooting Rectifier Design with Cross-Coupled MOSFETs and Driver Circuits

What is a rectifier and how does it work?

A rectifier is an electronic device that converts alternating current (AC) to direct current (DC). It works by using diodes to only allow current to flow in one direction, effectively converting the negative half of the AC wave to positive. This results in a more stable and usable form of current for electronic devices.

What are the different types of rectifiers?

There are three main types of rectifiers: half-wave, full-wave, and bridge. Half-wave rectifiers use a single diode to convert the AC wave to DC, while full-wave rectifiers use four diodes to convert both the positive and negative halves of the AC wave. Bridge rectifiers use four diodes arranged in a bridge configuration to convert AC to DC.

What factors should be considered when designing a rectifier?

There are several factors that should be considered when designing a rectifier, including the load requirements, input voltage and frequency, output voltage and current, and efficiency. The type of rectifier, as well as the type and size of diodes and other components, should also be carefully chosen based on these factors.

How can the efficiency of a rectifier be improved?

The efficiency of a rectifier can be improved by using higher quality components, such as diodes with lower forward voltage drop and higher current ratings. The design of the rectifier circuit can also be optimized for efficiency by minimizing losses and using proper heat sinking. Additionally, using a transformer with a lower turns ratio can improve efficiency by reducing the voltage and current stresses on the diodes.

What are some common challenges in rectifier design?

Some common challenges in rectifier design include managing heat dissipation, choosing the right components for the desired output, and ensuring proper filtering to reduce ripple in the output. In high power applications, managing high current and voltage stresses on the diodes can also be a challenge. Additionally, designing for efficiency and reliability while keeping costs low can also be a balancing act in rectifier design.

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