When a standard bipolar process is used in which there are vertical NPN transistors and lateral pnp transistors it is sometimes difficult to assess the lateral PNP parameters. This post addresses a way to estimate the current gain (BETA)of a lateral PNP from its geometry. The paper which describes this technique is located in the Signal Processing Group Inc., website at http://www.signalpro.biz. Interested readers are invited to peruse this article at their convenience.
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