Bias generator design

ajianer

BIAS CURRENT GENERATORS WITH WIDE DYNAMIC RANGE
Tobi Delbrück1, André van Schaik2


ABSTRACT
Mixed-signal or analog chips often require a wide range of biasing currents that are independent of process and supply voltage and that are proportional to absolute temperature. This paper describes CMOS circuits that we use to generate a set of fixed bias currents typically spanning six decades at room temperature down to a few times the transistor off-current. A bootstrapped current reference with a new startup and power-control mechanism generates a master current, which is successively divided by a current splitter to generate the desired reference currents. These references are nondestructively copied to form the chip’s biases. Measurements of behavior, including temperature effects from 1.6μ and 0.35μ implementations, are presented and nonidealities are investigated. Temperature dependence of the transistor off-current is investigated because it determines the lower limit for generated currents. Readers are directed to a design kit that allows easy generation of the complete layout for a bias generator with a set of desired currents for scalable MOSIS CMOS processes.
Key Words: bias current generator, current reference, current splitter, current divider, PTAT


共42页,

testliu

good stuff, thanks for share~

ajianer

好东西自己顶一下!!

elegance

正好要做一个低压偏置，看看有帮助不？

piao

真的很不错，谢谢！

pod

Thanks for your share!!

pikesmile

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iamxo

赞一个，确实不错。

xwj623