Bizen Forum

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  1. Super User
  2. Notable Answerer Sherlock Holmes
  3. About Bizen
  4. Wednesday, 20 March 2019
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A patent-pending wafer process, that’s an alternative to MOS and bipolar technology.
Bizen, an acronym of bipolar and Zener, uses Zener quantum tunnel mechanics to provide a different way to isolate the base well called the ‘Tunnel’ terminal. Designers can do away with the resistor, like in MOS and take advantage of the now controllable current. With Bizen, the output terminals that would normally be called the emitter, source, collector or drain, are instead called Anode 1 and 2. The two regions are identical, meaning the transistor has identical forward and reverse characteristics, allowing for AC signals and push/pull circuits.

The result is a disruptive wafer process with lower dynamic power, higher speed and higher gate density, all slingshot by 1\2 the process layers, 1\3 the material use and 1\10 the lead time.

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I just found a press-release today about the new Bizen transistor and find it very interesting for this project: , which is for the moment implemented by means of bipolar transistors for the analog and power part and CMOS for the FPGA, but where can I find more information and examples about how to drive and use these new transistors in practice in for example logic gates, analog circuits and power circuits (up to 40 V, 1 A)?

Is complementary technology possible, that is, comparable to both NPN and PNP transistors? The name A1 and A2 could indicate a drive scheme similar to an N-channel JFET and that a complementary device like a P-channel JFET is not possible.

Which device types are possible in the process? Is it for example possible to make resistors, fast diodes - preferable schottky diodes, capacitors and programmable non-volatile memory like an EEPROM?

Are any Spice models generally available? I have seen that they may be available as a part of a Cadence package, but for a start, some (simplified) models, which can be used with LTSpice would be a great help to find out if the Bizen technology is usable for our project.
  1. Shankar
  2. 1 week ago
  3. #3
Is there any experimental data which supports the claim of HV support, please? I would be very interested to know. Thank you
  1. Bizen
  2. 1 month ago
  3. #1
Hi Carsten,
Thank you for some great questions and link to your project. Keep your eye on this website or any of the wafertrain social media channel’s for updates and release information.
We are considering early adopter in-house projects to verify the PDK. Please get in touch if you wish to be considered.
In Bizen, you will be able to combine both the digital part of your circuit and power. 40V, 1A is no issue given 1200V 200A is our release target.
It’s not apparent but yes Bizen can be comparable to a push-pull technology such as complementary NPN PNP with the ability to push and pull current. Fast diodes, Schottky diodes, capacitors will also be in the PDK although we believe once you understand the PDK, you would switch to quantum tunnel parts.
Pseudo memory types are possible, but not available yet.
A Cadence PDK will be made available but due to the complexity of spice, only in Cadence and not yet.
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  1. more than a month ago
  2. About Bizen
  3. # 1
Accepted Answer Pending Moderation

Sounds interesting to be considered as an in-house project, but I still have my concerns whether the Bizen technology is usable for our project.

There is almost no information about how Bizen works and is used on this site - why(?) - but on the internet, I have found a little. It turns out that a Bizen NOR gate is very much equal to a two-transistors-plus-one-resistor TTL NAND gate (one multi-emitter input transistor with basis connected to Vcc through a resistor and the collector connected to the basis of the output transistor with open collector. This is also current controlled in the same way as the Bizen transistor and the collector output is therefore also normally on. I can understand that you want to highlight the new transistor in relation to CMOS and TTL, but your comparison between a single transistor Bizen NOR-gate and a 14-component TTL gate as shown for example here: is simply not fair!!! It only requires 3 components to do exactly the same with TTL, and in this case, the triggering level will be approximately 0.6 V above Vee where yours is 0.2-0.3 V below the positive supply rail, so they are also very much the same!

You mention 650 and 1200 V more places, but the operating principle of the Bizen transistor makes me believe that it can only handle very low voltage levels in the order of 3-5 V or else the zener inputs will break down, so analog circuitry above that voltage level is not possible. The high voltage and current levels, you mention, comes from the added NPN transistor - not from Bizen itself. Is this right?
  1. Bizen
  2. 3 weeks ago
  3. #2
Hi Carsten,
Thank you for your continued interest. In the early days of Bizen, some of your points would be correct, but, not anymore. You would need the PDK to understand this, which requires in-house projects to qualify it. If you email a spec we can see if it's a fit commercially and technically. Beyond that you will need to wait for various test results which were unfortunately delayed out of our control. We understand and share your frustration on this point.
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  1. 3 weeks ago
  2. About Bizen
  3. # 2
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